首页 > 最新文献

International Journal of Engineering Science最新文献

英文 中文
Exploring the impact of thermal fluctuations on continuous models of adhesion 探讨热波动对连续黏附模型的影响
IF 5.7 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-12-24 DOI: 10.1016/j.ijengsci.2024.104194
Claudia Binetti , Andrea Cannizzo , Giuseppe Florio , Nicola M. Pugno , Giuseppe Puglisi , Stefano Giordano
Adhesion and deadhesion processes at the interface between an object and a substrate are well-established phenomena in the realm of materials science and biophysics. These processes can be profoundly influenced by thermal fluctuations, a phenomenon empirically validated through numerous experimental observations. While discrete models have traditionally served as a foundation for understanding this intricate interplay, this paper seeks to bridge the gap between such discrete representations and the continuous models that more accurately reflect experimental scenarios. To achieve this objective, we initially adopt discrete models comprising n elements, selected such that their physical parameters converge towards the continuum limit as n approaches infinity. This thoughtful scaling ensures that the discrete system retains its relevance in the context of continuous media. Leveraging principles from Statistical Mechanics and Griffith-type total energy minimization approaches, we employ this scaled discrete model to investigate the impact of temperature in continuous adhesion phenomena. As a result, we obtain an analytical model to account for the decrease of the decohesion threshold depending on thermal (entropic) energy terms. Interestingly, our approach demonstrates that continuous adhesion models invariably exhibit phase transitions, whose critical temperatures can be derived through closed-form calculations. By elucidating these critical temperature values, this work enhances our understanding of adhesion processes within continuous media and opens new avenues for the exploration of adhesion-related phenomena in diverse scientific disciplines. Finally, the comparison with some experimental results is discussed.
在材料科学和生物物理学领域中,物体和基材之间界面的粘附和死粘过程是公认的现象。这些过程可以受到热波动的深刻影响,这是一种通过大量实验观察得到经验验证的现象。虽然离散模型传统上是理解这种复杂相互作用的基础,但本文试图弥合这种离散表示与更准确地反映实验场景的连续模型之间的差距。为了实现这一目标,我们最初采用包含n个元素的离散模型,选择使其物理参数在n接近无穷大时收敛于连续统极限。这种深思熟虑的尺度确保了离散系统在连续媒体的背景下保持其相关性。利用统计力学和griffith型总能量最小化方法的原理,我们采用该比例离散模型来研究温度对连续粘附现象的影响。因此,我们获得了一个解析模型来解释取决于热(熵)能项的退聚阈值的降低。有趣的是,我们的方法表明,连续粘附模型总是表现出相变,其临界温度可以通过封闭形式的计算得出。通过阐明这些临界温量值,这项工作增强了我们对连续介质中粘附过程的理解,并为探索不同科学学科中与粘附相关的现象开辟了新的途径。最后,与一些实验结果进行了比较。
{"title":"Exploring the impact of thermal fluctuations on continuous models of adhesion","authors":"Claudia Binetti ,&nbsp;Andrea Cannizzo ,&nbsp;Giuseppe Florio ,&nbsp;Nicola M. Pugno ,&nbsp;Giuseppe Puglisi ,&nbsp;Stefano Giordano","doi":"10.1016/j.ijengsci.2024.104194","DOIUrl":"10.1016/j.ijengsci.2024.104194","url":null,"abstract":"<div><div>Adhesion and deadhesion processes at the interface between an object and a substrate are well-established phenomena in the realm of materials science and biophysics. These processes can be profoundly influenced by thermal fluctuations, a phenomenon empirically validated through numerous experimental observations. While discrete models have traditionally served as a foundation for understanding this intricate interplay, this paper seeks to bridge the gap between such discrete representations and the continuous models that more accurately reflect experimental scenarios. To achieve this objective, we initially adopt discrete models comprising <span><math><mi>n</mi></math></span> elements, selected such that their physical parameters converge towards the continuum limit as <span><math><mi>n</mi></math></span> approaches infinity. This thoughtful scaling ensures that the discrete system retains its relevance in the context of continuous media. Leveraging principles from Statistical Mechanics and Griffith-type total energy minimization approaches, we employ this scaled discrete model to investigate the impact of temperature in continuous adhesion phenomena. As a result, we obtain an analytical model to account for the decrease of the decohesion threshold depending on thermal (entropic) energy terms. Interestingly, our approach demonstrates that continuous adhesion models invariably exhibit phase transitions, whose critical temperatures can be derived through closed-form calculations. By elucidating these critical temperature values, this work enhances our understanding of adhesion processes within continuous media and opens new avenues for the exploration of adhesion-related phenomena in diverse scientific disciplines. Finally, the comparison with some experimental results is discussed.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104194"},"PeriodicalIF":5.7,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142902111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A complementary energy-based constitutive model for the Mullins effect Mullins效应的互补能量本构模型
IF 5.7 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-12-22 DOI: 10.1016/j.ijengsci.2024.104195
Edgár Bertóti
A phenomenological pseudo-elastic model for isotropically elastic, incompressible materials exhibiting Mullins-type dissipation has been developed using a complementary energy-based approach. The work-conjugate constitutive variables in the inverse stress–strain relations are the Hencky logarithmic strain tensor and the Cauchy stress tensor. The thermo-mechanically consistent pseudo-elastic model is derived by applying the dissipation inequality in terms of complementary energy. The basic constitutive model for the virgin material is described by a complementary energy potential, which is assumed to be a power-law function of the second and third invariants of the deviatoric Cauchy stress tensor. The scalar measure of the maximum load is chosen to be the basic complementary energy. The virgin state variable describes the amplification of the logarithmic strain and behaves monotonically with respect to the Cauchy stress along the secondary loading paths. The applicability and efficacy of the model are demonstrated for uniaxial tension problems. The basic model contains three fitting parameters, and the monotonic amplification of the logarithmic strain is described by one additional fitting parameter. The predictive capability of this four-parameter pseudo-elastic model is validated through parameter fitting procedures using three different sets of experimental data from the open literature.
采用一种互补的基于能量的方法,建立了具有mullins型耗散的各向同性弹性不可压缩材料的现象学伪弹性模型。逆应力应变关系中的功共轭本构变量为Hencky对数应变张量和Cauchy应力张量。利用互补能的耗散不等式,导出了热力学一致伪弹性模型。原始材料的基本本构模型是由一个互补的能量势来描述的,它被假设为偏柯西应力张量的第二和第三不变量的幂律函数。选取最大负荷的标量量作为基本互补能。原始状态变量描述了对数应变的放大,并与柯西应力沿二次加载路径表现单调。验证了该模型对单轴拉伸问题的适用性和有效性。基本模型包含三个拟合参数,对数应变的单调放大由一个附加的拟合参数来描述。利用三组不同的实验数据,通过参数拟合程序验证了该四参数伪弹性模型的预测能力。
{"title":"A complementary energy-based constitutive model for the Mullins effect","authors":"Edgár Bertóti","doi":"10.1016/j.ijengsci.2024.104195","DOIUrl":"10.1016/j.ijengsci.2024.104195","url":null,"abstract":"<div><div>A phenomenological pseudo-elastic model for isotropically elastic, incompressible materials exhibiting Mullins-type dissipation has been developed using a complementary energy-based approach. The work-conjugate constitutive variables in the inverse stress–strain relations are the Hencky logarithmic strain tensor and the Cauchy stress tensor. The thermo-mechanically consistent pseudo-elastic model is derived by applying the dissipation inequality in terms of complementary energy. The basic constitutive model for the virgin material is described by a complementary energy potential, which is assumed to be a power-law function of the second and third invariants of the deviatoric Cauchy stress tensor. The scalar measure of the maximum load is chosen to be the basic complementary energy. The virgin state variable describes the amplification of the logarithmic strain and behaves monotonically with respect to the Cauchy stress along the secondary loading paths. The applicability and efficacy of the model are demonstrated for uniaxial tension problems. The basic model contains three fitting parameters, and the monotonic amplification of the logarithmic strain is described by one additional fitting parameter. The predictive capability of this four-parameter pseudo-elastic model is validated through parameter fitting procedures using three different sets of experimental data from the open literature.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104195"},"PeriodicalIF":5.7,"publicationDate":"2024-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A thermo-poroelasticity model for partially saturated porous media 部分饱和多孔介质的热孔弹性模型
IF 5.7 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-12-21 DOI: 10.1016/j.ijengsci.2024.104196
Zhi-He Jin , Michael L. Peterson
This work describes a thermo-poroelasticity model for a porous medium filled by two immiscible fluids in the framework of the Biot theory of poroelasticity. Local thermal equilibrium is assumed, i.e., the solid, the wetting fluid and the nonwetting fluid experience the same temperature variation in a continuum material particle. The constitutive relations in the present model include the thermally induced fluid content variations for both the wetting and nonwetting fluids. The model is employed to study the thermo-poroelastic responses of a borehole in a partially saturated, infinite porous medium subjected to a uniform temperature variation at the borehole boundary. The Laplace transform technique is used to obtain closed form, short time solutions for the thermally induced pore pressure and stress fields around the borehole. The analytical solutions indicate that the pore pressures of both the wetting and nonwetting fluids around the borehole at short times are characterized by the complementary error functions with the time scaled by partial saturation parameters as well as the thermal diffusivity of the porous medium. The numerical results for a porous medium dominantly filled by the wetting fluid indicate that the peak thermal pore pressure of the wetting fluid is much higher than that in the corresponding porous medium fully saturated by the wetting fluid while the thermal fluid content variation of the wetting fluid becomes lower due to partial saturation. Partial saturation also increases the thermal radial stress but the thermal hoop stress is relatively insensitive to partial saturation.
本文在Biot孔隙弹性理论的框架下,描述了由两种不混相流体填充的多孔介质的热孔隙弹性模型。假设局部热平衡,即固体、润湿流体和非润湿流体在连续介质中经历相同的温度变化。该模型中的本构关系包括了热诱导的润湿流体和非润湿流体的含量变化。利用该模型研究了部分饱和无限多孔介质中井眼边界温度均匀变化下的热孔弹性响应。利用拉普拉斯变换技术,得到了井周热致孔隙压力和应力场的封闭短时间解。解析解表明,在短时间内,井周润湿流体和非润湿流体的孔隙压力与部分饱和参数和多孔介质的热扩散率的时间标度呈互补误差函数。对主要由润湿流体填充的多孔介质的数值计算结果表明,润湿流体的热孔压力峰值远高于完全被润湿流体饱和的相应多孔介质,而润湿流体的热流体含量变化由于部分饱和而变小。部分饱和也增加了热径向应力,但热环应力对部分饱和相对不敏感。
{"title":"A thermo-poroelasticity model for partially saturated porous media","authors":"Zhi-He Jin ,&nbsp;Michael L. Peterson","doi":"10.1016/j.ijengsci.2024.104196","DOIUrl":"10.1016/j.ijengsci.2024.104196","url":null,"abstract":"<div><div>This work describes a thermo-poroelasticity model for a porous medium filled by two immiscible fluids in the framework of the Biot theory of poroelasticity. Local thermal equilibrium is assumed, i.e., the solid, the wetting fluid and the nonwetting fluid experience the same temperature variation in a continuum material particle. The constitutive relations in the present model include the thermally induced fluid content variations for both the wetting and nonwetting fluids. The model is employed to study the thermo-poroelastic responses of a borehole in a partially saturated, infinite porous medium subjected to a uniform temperature variation at the borehole boundary. The Laplace transform technique is used to obtain closed form, short time solutions for the thermally induced pore pressure and stress fields around the borehole. The analytical solutions indicate that the pore pressures of both the wetting and nonwetting fluids around the borehole at short times are characterized by the complementary error functions with the time scaled by partial saturation parameters as well as the thermal diffusivity of the porous medium. The numerical results for a porous medium dominantly filled by the wetting fluid indicate that the peak thermal pore pressure of the wetting fluid is much higher than that in the corresponding porous medium fully saturated by the wetting fluid while the thermal fluid content variation of the wetting fluid becomes lower due to partial saturation. Partial saturation also increases the thermal radial stress but the thermal hoop stress is relatively insensitive to partial saturation.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104196"},"PeriodicalIF":5.7,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Propagation of elastic waves in a fluid-filled cylindrical cavity located in a poroelastic medium: The influence of surface tension 弹性波在多孔弹性介质中充液圆柱腔中的传播:表面张力的影响
IF 5.7 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-12-21 DOI: 10.1016/j.ijengsci.2024.104197
Irina Markova, Mikhail Markov, Rafael Ávila-Carrera
In this work, synthetic waveforms generated by a point source of acoustic oscillations in a cylindrical cavity filled with a fluid are calculated using Biot's theory. The calculations are performed for the case when the pores and the cavity are filled with different immiscible fluids. The influence of surface tension on the parameters of elastic waves is investigated. It is shown that the influence of the effects associated with the presence of the surface tension is significant in the low frequency range (kf R) < 1, where kf is the wave number of the longitudinal wave in the fluid; R is the cavity radius.
The influence of capillary effects on the velocity and attenuation of the low-frequency zero-order normal mode (i. e., the Stoneley wave) has been studied. It is shown that the velocity and attenuation of this wave depend significantly on the surface tension at the boundary between the porous medium and the cavity. Our results show that the influence of capillary forces on kinematic and dynamic parameters of the zero-order normal mode increases with decreasing signal frequency.
在这项工作中,利用Biot的理论计算了在充满流体的圆柱形腔中由声学振荡点源产生的合成波形。对不同不混相流体填充孔隙和空腔的情况进行了计算。研究了表面张力对弹性波参数的影响。结果表明,在低频范围内,与表面张力相关的效应的影响是显著的(kf R) <;1,式中kf为纵波在流体中的波数;R是空腔半径。
{"title":"Propagation of elastic waves in a fluid-filled cylindrical cavity located in a poroelastic medium: The influence of surface tension","authors":"Irina Markova,&nbsp;Mikhail Markov,&nbsp;Rafael Ávila-Carrera","doi":"10.1016/j.ijengsci.2024.104197","DOIUrl":"10.1016/j.ijengsci.2024.104197","url":null,"abstract":"<div><div>In this work, synthetic waveforms generated by a point source of acoustic oscillations in a cylindrical cavity filled with a fluid are calculated using Biot's theory. The calculations are performed for the case when the pores and the cavity are filled with different immiscible fluids. The influence of surface tension on the parameters of elastic waves is investigated. It is shown that the influence of the effects associated with the presence of the surface tension is significant in the low frequency range (<em>k<sub>f</sub> R</em>) &lt; 1, where <em>k<sub>f</sub></em> is the wave number of the longitudinal wave in the fluid; <em>R</em> is the cavity radius.</div><div>The influence of capillary effects on the velocity and attenuation of the low-frequency zero-order normal mode (<em>i. e.,</em> the Stoneley wave) has been studied. It is shown that the velocity and attenuation of this wave depend significantly on the surface tension at the boundary between the porous medium and the cavity. Our results show that the influence of capillary forces on kinematic and dynamic parameters of the zero-order normal mode increases with decreasing signal frequency.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104197"},"PeriodicalIF":5.7,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A thermodynamically consistent theory for flexoelectronics: Interaction between strain gradient and electric current in flexoelectric semiconductors
IF 5.7 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-12-19 DOI: 10.1016/j.ijengsci.2024.104165
Yilin Qu , Ernian Pan , Feng Zhu , Qian Deng
This paper presents a continuum theory for flexoelectric semiconductors and analyzes the interaction between electric currents and inhomogeneous deformations, which provides an opportunity for strain gradient engineering. Basic principles for continuum physics, including mass conservation, charge conservation, balance of linear momentum, balance of angular momentum, electrostatics, and thermodynamic laws, are established in the reference configuration for a semiconducting continuum under finite deformation. Then, free-energy imbalance (dissipation inequality) is derived. Based on the dissipation inequality and the Coleman-Noll procedure, thermodynamically consistent constitutive equations are obtained, which account for piezoelectric, flexoelectric, thermoelectric couplings, and drift-diffusion effects for electric currents. The heat conduction equation and Joule heating generation are also derived by combining the energy balance and the second Gibbs relation. Additionally, the principle of virtual work for strain gradient-dependent semiconducting continuum under finite deformation is established. The framework is then geometrically linearized for applications in infinitesimal deformation and small concentration perturbations of free carriers. Based on the reduced linear model, we obtain the exact solutions for the plan-strain problem and then analyze the tuning mechanisms of different mechanical forces on the distribution of free carriers. It is observed that bending and shear deformation would induce the electric polarization and redistribution of free carriers along the thickness direction, whilst extension and thickness-stretch would induce polarization along the axial direction. Furthermore, based on the nonlinear model, we obtain the mechanical effect on the I-V characteristics of p-type flexoelectric semiconductors and flexoelectric PN junctions. Interestingly, mechanical forces can be seen as switches to gate the electric currents in semiconductor devices via flexoelectric polarizations. The theoretical model proposed in this article can guide the design of flexoelectronic devices and can also be used to analyze the flexoelectric effect in piezotronic devices. Since the formulation is based on finite deformation theory, it is also suitable for the analysis and design of flexible electronic devices.
{"title":"A thermodynamically consistent theory for flexoelectronics: Interaction between strain gradient and electric current in flexoelectric semiconductors","authors":"Yilin Qu ,&nbsp;Ernian Pan ,&nbsp;Feng Zhu ,&nbsp;Qian Deng","doi":"10.1016/j.ijengsci.2024.104165","DOIUrl":"10.1016/j.ijengsci.2024.104165","url":null,"abstract":"<div><div>This paper presents a continuum theory for flexoelectric semiconductors and analyzes the interaction between electric currents and inhomogeneous deformations, which provides an opportunity for strain gradient engineering. Basic principles for continuum physics, including mass conservation, charge conservation, balance of linear momentum, balance of angular momentum, electrostatics, and thermodynamic laws, are established in the reference configuration for a semiconducting continuum under finite deformation. Then, free-energy imbalance (dissipation inequality) is derived. Based on the dissipation inequality and the Coleman-Noll procedure, thermodynamically consistent constitutive equations are obtained, which account for piezoelectric, flexoelectric, thermoelectric couplings, and drift-diffusion effects for electric currents. The heat conduction equation and Joule heating generation are also derived by combining the energy balance and the second Gibbs relation. Additionally, the principle of virtual work for strain gradient-dependent semiconducting continuum under finite deformation is established. The framework is then geometrically linearized for applications in infinitesimal deformation and small concentration perturbations of free carriers. Based on the reduced linear model, we obtain the exact solutions for the plan-strain problem and then analyze the tuning mechanisms of different mechanical forces on the distribution of free carriers. It is observed that bending and shear deformation would induce the electric polarization and redistribution of free carriers along the thickness direction, whilst extension and thickness-stretch would induce polarization along the axial direction. Furthermore, based on the nonlinear model, we obtain the mechanical effect on the I-V characteristics of p-type flexoelectric semiconductors and flexoelectric PN junctions. Interestingly, mechanical forces can be seen as switches to gate the electric currents in semiconductor devices via flexoelectric polarizations. The theoretical model proposed in this article can guide the design of flexoelectronic devices and can also be used to analyze the flexoelectric effect in piezotronic devices. Since the formulation is based on finite deformation theory, it is also suitable for the analysis and design of flexible electronic devices.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104165"},"PeriodicalIF":5.7,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A time-domain viscoelastic model of nonlinear compression behavior under cyclic loading
IF 5.7 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-12-19 DOI: 10.1016/j.ijengsci.2024.104200
Jia-Xuan He , Zhao-Dong Xu , Qiang-Qiang Li , Zhong-Wei Hu , Ya-Xin Wei , Teng Ge , Yao-Rong Dong , Xing-Huai Huang , Gabriele Milani
Viscoelastic (VE) pads, commonly employed as passive damping components in damping devices to absorb and dissipate energy, present challenges in predicting the mechanical behavior under large deformation due to significant nonlinearity. This study introduces a novel nonlinear time-domain model to accurately characterize the response of VE pads subjected to cyclic loading across small, moderate, and large compressive deformations. Effects such as strain hardening, the Mullins effect, continuous stress softening, and residual deformation are incorporated into the model. The proposed model integrates hyperelastic, viscoelastic, and elastoplastic parts, arranged in parallel, each addressing distinct aspects of the mechanical behavior. The hyperelastic part captures the time-independent response, in particular strain hardening in nonlinear stiffness. The VE part accounts for the frequency-dependent damping behavior, focusing on the initial unloading stiffness, the shape and area of the hysteresis loop, and major residual deformations. The elastoplastic part models the frequency-dependent plasticity, adjusting residual deformation and determining the extent of Mullins effect and continuous stress softening. Model parameters are determined through fitting procedures using uniaxial quasi-static and cyclic compression test data, allowing for an accurate description of the nonlinear mechanical behavior in the time domain. To assess the prediction capacity and applicability of the proposed model, the simulation results are comparatively evaluated by error analysis. The sensitivity analysis is further performed to investigate the influence of individual parameters. The proposed model demonstrates high accuracy and robustness in representing the mechanical behavior of VE pads across small, moderate, and large compressive deformations. The parameters in the hyperelastic, viscoelastic, and elastoplastic parts have accurate interpretations, providing distinct roles and contributions to the overall mechanical behavior.
{"title":"A time-domain viscoelastic model of nonlinear compression behavior under cyclic loading","authors":"Jia-Xuan He ,&nbsp;Zhao-Dong Xu ,&nbsp;Qiang-Qiang Li ,&nbsp;Zhong-Wei Hu ,&nbsp;Ya-Xin Wei ,&nbsp;Teng Ge ,&nbsp;Yao-Rong Dong ,&nbsp;Xing-Huai Huang ,&nbsp;Gabriele Milani","doi":"10.1016/j.ijengsci.2024.104200","DOIUrl":"10.1016/j.ijengsci.2024.104200","url":null,"abstract":"<div><div>Viscoelastic (VE) pads, commonly employed as passive damping components in damping devices to absorb and dissipate energy, present challenges in predicting the mechanical behavior under large deformation due to significant nonlinearity. This study introduces a novel nonlinear time-domain model to accurately characterize the response of VE pads subjected to cyclic loading across small, moderate, and large compressive deformations. Effects such as strain hardening, the Mullins effect, continuous stress softening, and residual deformation are incorporated into the model. The proposed model integrates hyperelastic, viscoelastic, and elastoplastic parts, arranged in parallel, each addressing distinct aspects of the mechanical behavior. The hyperelastic part captures the time-independent response, in particular strain hardening in nonlinear stiffness. The VE part accounts for the frequency-dependent damping behavior, focusing on the initial unloading stiffness, the shape and area of the hysteresis loop, and major residual deformations. The elastoplastic part models the frequency-dependent plasticity, adjusting residual deformation and determining the extent of Mullins effect and continuous stress softening. Model parameters are determined through fitting procedures using uniaxial quasi-static and cyclic compression test data, allowing for an accurate description of the nonlinear mechanical behavior in the time domain. To assess the prediction capacity and applicability of the proposed model, the simulation results are comparatively evaluated by error analysis. The sensitivity analysis is further performed to investigate the influence of individual parameters. The proposed model demonstrates high accuracy and robustness in representing the mechanical behavior of VE pads across small, moderate, and large compressive deformations. The parameters in the hyperelastic, viscoelastic, and elastoplastic parts have accurate interpretations, providing distinct roles and contributions to the overall mechanical behavior.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104200"},"PeriodicalIF":5.7,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Growth in biphasic tissue
IF 5.7 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-12-18 DOI: 10.1016/j.ijengsci.2024.104183
Marlon Suditsch, Franziska S. Egli, Lena Lambers, Tim Ricken
Continuum mechanical models for growth and remodelling of biological tissue are well suited for the description of physiological and pathological processes, such as bone remodelling, muscle adaption or the progression of a tumour. An overview of four selected growth models from the literature is given and fundamental kinematic and multiphasic approaches for open and closed systems are outlined. Beyond that, a biphasic model using the Theory of Porous Media is enhanced by the kinematic split of the deformation gradient for the study of a growing cylinder. Based on the analytical solution of the specific case without outflow, a novel growth approach is developed allowing a gradual consideration of the kinematic split. Subsequently, this approach is applied to the extended case with outflow and evaluated numerically. Herein, consolidating characteristics of growth that are driven by the interaction of fluid pressure and solid stress are identified. Finally, a numerical example of a growing body embedded in surrounding tissue shows that residual compressive stresses arise due to incompatible deformation.
{"title":"Growth in biphasic tissue","authors":"Marlon Suditsch,&nbsp;Franziska S. Egli,&nbsp;Lena Lambers,&nbsp;Tim Ricken","doi":"10.1016/j.ijengsci.2024.104183","DOIUrl":"10.1016/j.ijengsci.2024.104183","url":null,"abstract":"<div><div>Continuum mechanical models for growth and remodelling of biological tissue are well suited for the description of physiological and pathological processes, such as bone remodelling, muscle adaption or the progression of a tumour. An overview of four selected growth models from the literature is given and fundamental kinematic and multiphasic approaches for open and closed systems are outlined. Beyond that, a biphasic model using the Theory of Porous Media is enhanced by the kinematic split of the deformation gradient for the study of a growing cylinder. Based on the analytical solution of the specific case without outflow, a novel growth approach is developed allowing a gradual consideration of the kinematic split. Subsequently, this approach is applied to the extended case with outflow and evaluated numerically. Herein, consolidating characteristics of growth that are driven by the interaction of fluid pressure and solid stress are identified. Finally, a numerical example of a growing body embedded in surrounding tissue shows that residual compressive stresses arise due to incompatible deformation.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104183"},"PeriodicalIF":5.7,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Negative electrical conductivity metamaterials and their properties
IF 5.7 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-12-18 DOI: 10.1016/j.ijengsci.2024.104198
Edward Bormashenko
The system of non-interacting electrically charged core-massless spring-shell mechanical units, demonstrating negative effective mass, is considered, seen as a Drude–Lorentz gas. When such an ideal gas is exposed to the external harmonic field, it demonstrates as the certain conditions the negative frequency-dependent electrical conductivity. The negative value of the electrical conductivity σ implies that the electrical current will flow against the direction of the electric field and correspondingly the direction of the electrical force. Low- and high-frequency asymptotic behavior of the electrical conductivity is addressed. The same system demonstrates at low frequencies the negative asymptotic refraction. Experimental realization of the introduced model system, based on the exploitation of plasma oscillations of the free electron gas is suggested.
{"title":"Negative electrical conductivity metamaterials and their properties","authors":"Edward Bormashenko","doi":"10.1016/j.ijengsci.2024.104198","DOIUrl":"10.1016/j.ijengsci.2024.104198","url":null,"abstract":"<div><div>The system of non-interacting electrically charged core-massless spring-shell mechanical units, demonstrating negative effective mass, is considered, seen as a Drude–Lorentz gas. When such an ideal gas is exposed to the external harmonic field, it demonstrates as the certain conditions the negative frequency-dependent electrical conductivity. The negative value of the electrical conductivity <span><math><mi>σ</mi></math></span> implies that the electrical current will flow against the direction of the electric field and correspondingly the direction of the electrical force. Low- and high-frequency asymptotic behavior of the electrical conductivity is addressed. The same system demonstrates at low frequencies the negative asymptotic refraction. Experimental realization of the introduced model system, based on the exploitation of plasma oscillations of the free electron gas is suggested.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104198"},"PeriodicalIF":5.7,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Size-dependent stability of embedded beams with variable cross section
IF 5.7 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-12-18 DOI: 10.1016/j.ijengsci.2024.104210
Ömer Civalek , Bekir Akgöz
This paper deals with the investigation of the elastic stability of double tapered microbeams embedded in Winkler elastic foundation. It is considered that the microbeam is embedded in a continuous elastic constraint and its cross-section changes linearly along the longitudinal direction. Nonlocal couple stress theory and Bernoulli-Euler beam theory are used to obtain the size-dependent constitutive equation. Rayleigh-Ritz method with algebraic polynomials is utilized to find the minimum eigenvalue as the critical buckling load for simply supported tapered microbeams. The effects of taper ratio, taper type, nonlocal and length scale parameters, and foundation parameter are comprehensively examined.
{"title":"Size-dependent stability of embedded beams with variable cross section","authors":"Ömer Civalek ,&nbsp;Bekir Akgöz","doi":"10.1016/j.ijengsci.2024.104210","DOIUrl":"10.1016/j.ijengsci.2024.104210","url":null,"abstract":"<div><div>This paper deals with the investigation of the elastic stability of double tapered microbeams embedded in Winkler elastic foundation. It is considered that the microbeam is embedded in a continuous elastic constraint and its cross-section changes linearly along the longitudinal direction. Nonlocal couple stress theory and Bernoulli-Euler beam theory are used to obtain the size-dependent constitutive equation. Rayleigh-Ritz method with algebraic polynomials is utilized to find the minimum eigenvalue as the critical buckling load for simply supported tapered microbeams. The effects of taper ratio, taper type, nonlocal and length scale parameters, and foundation parameter are comprehensively examined.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104210"},"PeriodicalIF":5.7,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On nonlinear 3D electro-elastic numerical modeling of two-phase inhomogeneous FG piezocomposites reinforced with GNPs GNPs增强两相非均匀FG压电复合材料的非线性三维电弹数值模拟
IF 5.7 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-11-27 DOI: 10.1016/j.ijengsci.2024.104174
Mohammad Malikan , Shahriar Dastjerdi , Magdalena Rucka , Mehran Kadkhodayan
The novelty here comes from not only the perfect nonlinear three-dimensional (3D) electro-elasticity investigation but also the mixed material itself. The literature widely showed mechanical assessments on the piezoelectric structures; however, a lack of nonlinear three-dimensional elasticity studies has been witnessed on these kinds of smart materials. Therefore, a nonlinear 3D elasticity-piezoelectricity coupling is considered in this study. What is more, this research brings about an era in the field of sensing manufacturing such as sensors and actuators by proposing the construction of these devices in an advanced composite framework. The piezoelectric medium can be electro-mechanically improved with the aggregation of graphene platelets/nanoplatelets (GPLs/GNPs) based on the functionally graded (FG) composition. The assumption for such a smart composite has been made to provide higher flexibility smart tools while their elastic strength can also get further. To accomplish this, the derivation of a rigorous mathematical model has come out for a transversely isotropic inhomogeneous FG-piezoelectric beam-like sensor/actuator using 3D kinematic displacements, geometrically nonlinear strains, Lagrange technique, 3D stress-strains tensors, linear elastic material, and in particular Halpin-Tsai micro-mechanic model. Numerical modeling has been built by the generalized differential quadrature (GDQ) technique. A comprehensive parametric study has also been established for intelligent FG beams.
其新颖之处不仅在于其完美的非线性三维电弹性研究,还在于混合材料本身。文献对压电结构进行了广泛的力学评价;然而,关于这类智能材料的非线性三维弹性研究一直缺乏。因此,本研究考虑了非线性三维弹性-压电耦合。更重要的是,本研究提出了在先进的复合材料框架中构建传感器和执行器等传感制造领域的一个时代。基于功能梯度(FG)组成的石墨烯片/纳米片(GPLs/GNPs)聚集可以改善压电介质的机电性能。这种智能复合材料的设想是在提供更高灵活性的智能工具的同时,其弹性强度也可以得到进一步提高。为此,本文利用三维运动位移、几何非线性应变、拉格朗日技术、三维应力-应变张量、线性弹性材料,特别是Halpin-Tsai微力学模型,推导了横向各向同性非均匀fg -压电类梁式传感器/执行器的严格数学模型。采用广义微分正交(GDQ)技术建立了数值模拟。对智能FG梁进行了全面的参数化研究。
{"title":"On nonlinear 3D electro-elastic numerical modeling of two-phase inhomogeneous FG piezocomposites reinforced with GNPs","authors":"Mohammad Malikan ,&nbsp;Shahriar Dastjerdi ,&nbsp;Magdalena Rucka ,&nbsp;Mehran Kadkhodayan","doi":"10.1016/j.ijengsci.2024.104174","DOIUrl":"10.1016/j.ijengsci.2024.104174","url":null,"abstract":"<div><div>The novelty here comes from not only the perfect nonlinear three-dimensional (3D) electro-elasticity investigation but also the mixed material itself. The literature widely showed mechanical assessments on the piezoelectric structures; however, a lack of nonlinear three-dimensional elasticity studies has been witnessed on these kinds of smart materials. Therefore, a nonlinear 3D elasticity-piezoelectricity coupling is considered in this study. What is more, this research brings about an era in the field of sensing manufacturing such as sensors and actuators by proposing the construction of these devices in an advanced composite framework. The piezoelectric medium can be electro-mechanically improved with the aggregation of graphene platelets/nanoplatelets (GPLs/GNPs) based on the functionally graded (FG) composition. The assumption for such a smart composite has been made to provide higher flexibility smart tools while their elastic strength can also get further. To accomplish this, the derivation of a rigorous mathematical model has come out for a transversely isotropic inhomogeneous FG-piezoelectric beam-like sensor/actuator using 3D kinematic displacements, geometrically nonlinear strains, Lagrange technique, 3D stress-strains tensors, linear elastic material, and in particular Halpin-Tsai micro-mechanic model. Numerical modeling has been built by the generalized differential quadrature (GDQ) technique. A comprehensive parametric study has also been established for intelligent FG beams.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"207 ","pages":"Article 104174"},"PeriodicalIF":5.7,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
International Journal of Engineering Science
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1