As metamaterials are widely used in engineering fields, the demand for the extraordinary properties of metamaterials is no longer satisfied with a single function. The multi-functional integrated design of metamaterial structure is the basis of a new research direction and technology path applied to engineering equipment with complex working conditions. At present, in the aerospace, transportation, and other engineering fields, there is a high demand for lightweight mechanical metamaterials with high mechanical properties and strong energy absorption characteristics. Therefore, an integrated design method of multi-functional metamaterial structures with impact resistance and vibration reduction characteristics is proposed in the work. Through the stiffness analysis of the curved beam structure, the influence law of the structure parameters on stiffness is obtained, to design the structure form which is prone to rotating buckling and realize the limitation of impact energy. In addition, by tuning the strain of the cell structure, the characteristic frequency is reduced to zero, to obtain the overdamping effect and greatly improve the impact energy attenuation characteristics of the structure. The multi-layer design idea is integrated into the structural design, and the combination of hyperelastic material and metal is adopted to realize the integrated design of high stiffness and high damping characteristics, and the design criteria of lightweight is guaranteed. Based on the design concept of biomimetic metamaterials, the multi-scale lattice structure with local resonant bandgap is constructed through fractal design. By introducing the improved IHB method, the bandgap characteristics of the lattice structure are analyzed theoretically, and the vibration control technology with the large bandwidth is realized by parameter design, in which the bandwidth range is up to 5kHz. Through the design strategy of the multi-stage energy absorption structure, the energy dissipation characteristics of the structure are further improved, the limit of structure thickness is broken, and the excellent energy absorption effect is achieved under the condition of low-thickness (single-layer array structure), in which the attenuation rate of impact displacement and impact acceleration is greater than 97 %. The key problem that dynamic mechanical properties are difficult to integrate with static mechanical properties in metamaterial structures is solved. The vibration control characteristics and impact resistance characteristics of the structure are verified by experiments, which confirms the authenticity and accuracy of the research work. The work achieves perfect compatibility of impact resistance characteristics and vibration reduction characteristics and achieves an excellent energy absorption effect with the single-layer array structure. It provides the theoretical and technical basis for the development of multi-functional integrated design methods of metamaterial
{"title":"Multi-functional metamaterial based on overdamping effect: Design, investigation, optimization","authors":"Hongyu Wang, Jian Zhao, Xuefeng Wang, Pengbo Liu, Jue Gong, Yu Huang","doi":"10.1016/j.ijmecsci.2024.109890","DOIUrl":"https://doi.org/10.1016/j.ijmecsci.2024.109890","url":null,"abstract":"As metamaterials are widely used in engineering fields, the demand for the extraordinary properties of metamaterials is no longer satisfied with a single function. The multi-functional integrated design of metamaterial structure is the basis of a new research direction and technology path applied to engineering equipment with complex working conditions. At present, in the aerospace, transportation, and other engineering fields, there is a high demand for lightweight mechanical metamaterials with high mechanical properties and strong energy absorption characteristics. Therefore, an integrated design method of multi-functional metamaterial structures with impact resistance and vibration reduction characteristics is proposed in the work. Through the stiffness analysis of the curved beam structure, the influence law of the structure parameters on stiffness is obtained, to design the structure form which is prone to rotating buckling and realize the limitation of impact energy. In addition, by tuning the strain of the cell structure, the characteristic frequency is reduced to zero, to obtain the overdamping effect and greatly improve the impact energy attenuation characteristics of the structure. The multi-layer design idea is integrated into the structural design, and the combination of hyperelastic material and metal is adopted to realize the integrated design of high stiffness and high damping characteristics, and the design criteria of lightweight is guaranteed. Based on the design concept of biomimetic metamaterials, the multi-scale lattice structure with local resonant bandgap is constructed through fractal design. By introducing the improved IHB method, the bandgap characteristics of the lattice structure are analyzed theoretically, and the vibration control technology with the large bandwidth is realized by parameter design, in which the bandwidth range is up to 5kHz. Through the design strategy of the multi-stage energy absorption structure, the energy dissipation characteristics of the structure are further improved, the limit of structure thickness is broken, and the excellent energy absorption effect is achieved under the condition of low-thickness (single-layer array structure), in which the attenuation rate of impact displacement and impact acceleration is greater than 97 %. The key problem that dynamic mechanical properties are difficult to integrate with static mechanical properties in metamaterial structures is solved. The vibration control characteristics and impact resistance characteristics of the structure are verified by experiments, which confirms the authenticity and accuracy of the research work. The work achieves perfect compatibility of impact resistance characteristics and vibration reduction characteristics and achieves an excellent energy absorption effect with the single-layer array structure. It provides the theoretical and technical basis for the development of multi-functional integrated design methods of metamaterial","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"42 1","pages":""},"PeriodicalIF":7.3,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825076","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}
Recent advancements have identified orbital angular momentum (OAM) as a promising multiplexing strategy leveraging vortex beams to significantly enhance communication channel capacity. However, existing OAM signal demultiplexing methods, including active scanning and passive resonant techniques, encounter limitations such as reduced data transmission rates and the reliance on bulky, inefficient systems. In this work, we utilize gradient metamaterial Luneburg lens as a transformation medium to convert two-dimensional (2D) vortex beams into transmitted beams oriented in multiple directions. This approach not only improves system efficiency but also simplifies the OAM multiplexing framework. Through analysis, simulation and experiments, we verify the fast and broadband working properties of Luneburg lens constructed by non-resonant metamaterial unit cell. Additionally, by applying the coordinate transformation method, we further expand the beam separation angles achievable with the metamaterial lens. Notably, the vortex-based beamforming strategy also proves effective for multi-beam Luneburg lenses. Our work introduces a streamlined and efficient strategy for vortex detection and beam scanning, paving the way for advancements in high-speed, high-capacity acoustic communication systems and on-chip signal detection technologies.
{"title":"Acoustic metamaterial lens for two-dimensional vortex beamforming and perception","authors":"Yangyang Zhou, Yuhang Yin, Pengfei Zhao, Qilin Duan, Zhibin Zhang, Zhanlei Hao, Shan Zhu, Weihen Shao, Huanyang Chen","doi":"10.1016/j.ijmecsci.2024.109884","DOIUrl":"https://doi.org/10.1016/j.ijmecsci.2024.109884","url":null,"abstract":"Recent advancements have identified orbital angular momentum (OAM) as a promising multiplexing strategy leveraging vortex beams to significantly enhance communication channel capacity. However, existing OAM signal demultiplexing methods, including active scanning and passive resonant techniques, encounter limitations such as reduced data transmission rates and the reliance on bulky, inefficient systems. In this work, we utilize gradient metamaterial Luneburg lens as a transformation medium to convert two-dimensional (2D) vortex beams into transmitted beams oriented in multiple directions. This approach not only improves system efficiency but also simplifies the OAM multiplexing framework. Through analysis, simulation and experiments, we verify the fast and broadband working properties of Luneburg lens constructed by non-resonant metamaterial unit cell. Additionally, by applying the coordinate transformation method, we further expand the beam separation angles achievable with the metamaterial lens. Notably, the vortex-based beamforming strategy also proves effective for multi-beam Luneburg lenses. Our work introduces a streamlined and efficient strategy for vortex detection and beam scanning, paving the way for advancements in high-speed, high-capacity acoustic communication systems and on-chip signal detection technologies.","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"46 1","pages":""},"PeriodicalIF":7.3,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825244","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}
Pub Date : 2024-11-30DOI: 10.1016/j.ijmecsci.2024.109873
Yongfeng Zhang, Ziyuan Zhu, Zhehao Sheng, Yinzhi He, Gang Wang
This paper delves into the vibration and acoustic radiation properties of a metamaterial plate integrated with grouped local resonators (GLRs). The GLRs, consisting of multiple spring-mass resonators arranged in various configurations such as series, parallel, and periodic arrangements, are shown to significantly influence the structural performance of the plate. An advanced Fourier series is implemented to articulate the displacement functions and surface acoustic pressure of the plate. By utilizing the energy principle, a vibro-acoustic coupling model is developed to describe the interaction between the metamaterial plate and the external acoustic field. The theoretical framework is rigorously validated against finite element method simulations, yielding highly congruent results. The local resonance bandgap behavior is explored, and the results reveal that the arrangement and connection strategy of the GLRs determine the stopband characteristics. Multiple resonators connected in series lead to an increased number of stopbands and more pronounced attenuation valleys, whereas multiple resonators connected in parallel or arranged in a periodic array result in an unchanged number of stopbands but a significantly wider stopband bandwidth. Furthermore, transmission characteristic assessments substantiate the vibration dampening efficacy of GLRs, and the marked suppressions in flexural wave propagation are demonstrated within the multiple merged bandgaps. These insights advance the comprehension of localized resonance phenomena in metamaterials and inform the development of sophisticated noise and vibration control strategies.
{"title":"Vibro-acoustic suppression of metamaterial plates in multi-bandgaps","authors":"Yongfeng Zhang, Ziyuan Zhu, Zhehao Sheng, Yinzhi He, Gang Wang","doi":"10.1016/j.ijmecsci.2024.109873","DOIUrl":"https://doi.org/10.1016/j.ijmecsci.2024.109873","url":null,"abstract":"This paper delves into the vibration and acoustic radiation properties of a metamaterial plate integrated with grouped local resonators (GLRs). The GLRs, consisting of multiple spring-mass resonators arranged in various configurations such as series, parallel, and periodic arrangements, are shown to significantly influence the structural performance of the plate. An advanced Fourier series is implemented to articulate the displacement functions and surface acoustic pressure of the plate. By utilizing the energy principle, a vibro-acoustic coupling model is developed to describe the interaction between the metamaterial plate and the external acoustic field. The theoretical framework is rigorously validated against finite element method simulations, yielding highly congruent results. The local resonance bandgap behavior is explored, and the results reveal that the arrangement and connection strategy of the GLRs determine the stopband characteristics. Multiple resonators connected in series lead to an increased number of stopbands and more pronounced attenuation valleys, whereas multiple resonators connected in parallel or arranged in a periodic array result in an unchanged number of stopbands but a significantly wider stopband bandwidth. Furthermore, transmission characteristic assessments substantiate the vibration dampening efficacy of GLRs, and the marked suppressions in flexural wave propagation are demonstrated within the multiple merged bandgaps. These insights advance the comprehension of localized resonance phenomena in metamaterials and inform the development of sophisticated noise and vibration control strategies.","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"36 1","pages":""},"PeriodicalIF":7.3,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142793851","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}
Pub Date : 2024-11-30DOI: 10.1016/j.ijmecsci.2024.109859
Yingwu Li, Zahra Sharif-Khodaei
Shape sensing is critically important throughout the lifecycle of composite shell structures, including the design, manufacturing, service, retirement, and reuse phases. In the service phase, for instance, shape-based structural integrity assessments can inform maintenance strategies, significantly reducing regular maintenance costs. To achieve high-fidelity shape sensing, a novel approach is proposed for strain acquisition and interpolation in carbon fibre reinforced polymer (CFRP) shell structures, utilizing distributed fibre optic sensing. This method is designed to enhance the performance of the inverse finite element method (iFEM). The approach introduces a new strain acquisition strategy based on distributed fibre optic sensors and a strain interpolation technique leveraging single image super-resolution (SISR). In the strain acquisition process, a fundamental sensing block capable of capturing both normal and shear strain is employed for sensor network design, which can be easily implemented using fibre optic sensors. The goal of this acquisition strategy is to standardize sensor network design and provide a digital representation, offering novel insights into shape reconstruction for different composite shells across various applications. Utilizing the obtained strain field, the SISR-based strain interpolation method generates a displacement field with enhanced spatial resolution through iFEM. Experimental evaluation of the SISR-based interpolation demonstrates its efficacy in capturing high-fidelity displacement fields in both smooth and non-smooth strain regions of CFRP shell structures. The introduction of SISR in strain field interpolation, for the first time, offers a potential solution to the challenge of interpolating non-smooth strain fields, providing a reference for addressing complex strain field interpolation in practical applications.
{"title":"Shape sensing of composite shell using distributed fibre optic sensing","authors":"Yingwu Li, Zahra Sharif-Khodaei","doi":"10.1016/j.ijmecsci.2024.109859","DOIUrl":"https://doi.org/10.1016/j.ijmecsci.2024.109859","url":null,"abstract":"Shape sensing is critically important throughout the lifecycle of composite shell structures, including the design, manufacturing, service, retirement, and reuse phases. In the service phase, for instance, shape-based structural integrity assessments can inform maintenance strategies, significantly reducing regular maintenance costs. To achieve high-fidelity shape sensing, a novel approach is proposed for strain acquisition and interpolation in carbon fibre reinforced polymer (CFRP) shell structures, utilizing distributed fibre optic sensing. This method is designed to enhance the performance of the inverse finite element method (iFEM). The approach introduces a new strain acquisition strategy based on distributed fibre optic sensors and a strain interpolation technique leveraging single image super-resolution (SISR). In the strain acquisition process, a fundamental sensing block capable of capturing both normal and shear strain is employed for sensor network design, which can be easily implemented using fibre optic sensors. The goal of this acquisition strategy is to standardize sensor network design and provide a digital representation, offering novel insights into shape reconstruction for different composite shells across various applications. Utilizing the obtained strain field, the SISR-based strain interpolation method generates a displacement field with enhanced spatial resolution through iFEM. Experimental evaluation of the SISR-based interpolation demonstrates its efficacy in capturing high-fidelity displacement fields in both smooth and non-smooth strain regions of CFRP shell structures. The introduction of SISR in strain field interpolation, for the first time, offers a potential solution to the challenge of interpolating non-smooth strain fields, providing a reference for addressing complex strain field interpolation in practical applications.","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"41 44 1","pages":""},"PeriodicalIF":7.3,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142793897","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}
Pub Date : 2024-11-30DOI: 10.1016/j.ijmecsci.2024.109865
Dong Il Shim, Maroosol Yun, Yong-Hyeon Kim, Donghwi Lee, Hyung Hee Cho
In the present study, we utilized additive manufacturing, specifically 3d printing, to enhance the boiling heat transfer performance. This study stands out from the previous ones in that we utilized a vapor guiding structure (VGS) for direct bubble control. The relationship between the bubble behavior and the boiling heat transfer performance was evaluated through visualization analysis. With the application of the VGS, the bubble departure diameter, including the growth mechanism, was successfully controlled. High-speed images verified a physical delay in lateral merging by establishing a liquid-vapor pathway. Consequently, the heat transfer coefficient and critical heat flux were enhanced. We also examined the influence of the geometric design of the VGS on bubble behavior control and the boiling heat transfer performance. Following experimental validation, we expect future breakthroughs in boiling heat transfer by refining single bubble control and enhancing arrays. Additionally, the current applicability can be potentially expanded through the application of 3d printed structures.
{"title":"3D-Printed vapor guiding structures for enhanced pool boiling heat transfer","authors":"Dong Il Shim, Maroosol Yun, Yong-Hyeon Kim, Donghwi Lee, Hyung Hee Cho","doi":"10.1016/j.ijmecsci.2024.109865","DOIUrl":"https://doi.org/10.1016/j.ijmecsci.2024.109865","url":null,"abstract":"In the present study, we utilized additive manufacturing, specifically 3d printing, to enhance the boiling heat transfer performance. This study stands out from the previous ones in that we utilized a vapor guiding structure (VGS) for direct bubble control. The relationship between the bubble behavior and the boiling heat transfer performance was evaluated through visualization analysis. With the application of the VGS, the bubble departure diameter, including the growth mechanism, was successfully controlled. High-speed images verified a physical delay in lateral merging by establishing a liquid-vapor pathway. Consequently, the heat transfer coefficient and critical heat flux were enhanced. We also examined the influence of the geometric design of the VGS on bubble behavior control and the boiling heat transfer performance. Following experimental validation, we expect future breakthroughs in boiling heat transfer by refining single bubble control and enhancing arrays. Additionally, the current applicability can be potentially expanded through the application of 3d printed structures.","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"37 1","pages":""},"PeriodicalIF":7.3,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142793877","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}
The Complex reheating phenomenon during friction stir additive manufacturing (FSAM) has a significant impact on the microstructural evolution. This, in turn, affects its mechanical properties. A flow stress model including the precipitate, solid solution and dislocation density evolution was proposed to reveal the relationship between the microstructure and constitutive behavior in FSAM of Al-Mg-Si alloys. The microstructure and mechanical properties of single-layer and multi-layer FSAM were investigated using experimental and numerical simulation methods. The results revealed that during the first reheating process, the precipitates exhibited dissolution and coarsening behavior in the heating stage. In the third reheating process, precipitates were generated during the heating stage because of the lower temperature. The multiple reheating process in FSAM promoted the generation of precipitates in the stirring zone. This phenomenon increased the yield strength from 183.46 MPa to 189.95 MPa. Meanwhile, the precipitate nucleation and growth during reheating process depleted the concentrations of Si and Mg in the matrix. A comparison of the stress-strain curves before and after the reheating process, revealed that the reheating process reduces the net flow stress in the plastic deformation stage. A decrease in the concentration of solid solution elements caused a decrease in the statistically stored dislocation density, and thereby, decreased the net flow stress.
{"title":"Microstructure-based simulation of constitutive behaviors in friction stir additive manufacturing","authors":"Jianyu Li, Binbin Wang, Lars-Erik Lindgren, Zhao Zhang","doi":"10.1016/j.ijmecsci.2024.109863","DOIUrl":"https://doi.org/10.1016/j.ijmecsci.2024.109863","url":null,"abstract":"The Complex reheating phenomenon during friction stir additive manufacturing (FSAM) has a significant impact on the microstructural evolution. This, in turn, affects its mechanical properties. A flow stress model including the precipitate, solid solution and dislocation density evolution was proposed to reveal the relationship between the microstructure and constitutive behavior in FSAM of Al-Mg-Si alloys. The microstructure and mechanical properties of single-layer and multi-layer FSAM were investigated using experimental and numerical simulation methods. The results revealed that during the first reheating process, the precipitates exhibited dissolution and coarsening behavior in the heating stage. In the third reheating process, precipitates were generated during the heating stage because of the lower temperature. The multiple reheating process in FSAM promoted the generation of precipitates in the stirring zone. This phenomenon increased the yield strength from 183.46 MPa to 189.95 MPa. Meanwhile, the precipitate nucleation and growth during reheating process depleted the concentrations of Si and Mg in the matrix. A comparison of the stress-strain curves before and after the reheating process, revealed that the reheating process reduces the net flow stress in the plastic deformation stage. A decrease in the concentration of solid solution elements caused a decrease in the statistically stored dislocation density, and thereby, decreased the net flow stress.","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"213 1","pages":""},"PeriodicalIF":7.3,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142793872","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}
Pub Date : 2024-11-28DOI: 10.1016/j.ijmecsci.2024.109861
Stephen Daynes , Stefanie Feih
Lattice structures are lightweight and are known to exhibit excellent energy absorbing capability when subject to compressive loading. In this paper, a new analytical model for the stiffness, strength, and energy absorption of additively manufactured functionally graded lattice structures is presented, leading to the establishment of a new energy absorption optimisation approach. The influence of cell orientation, cell aspect ratio, and cell relative density on the mechanical properties is characterised. The optimal through-thickness density distribution to maximise energy absorption is determined, subject to mass and initial stiffness constraints. Energy absorption is shown experimentally to increase by up to 67.1 % via tailored through-thickness grading of the structure's relative density. Finite element models are also developed to accurately describe the mechanical performance of these functionally graded lattice structures. These models provide valuable insight into the properties of functionally graded lattice structures and can serve as a basis for the tailored design of lightweight energy absorbers.
{"title":"Functionally graded lattice structures with tailored stiffness and energy absorption","authors":"Stephen Daynes , Stefanie Feih","doi":"10.1016/j.ijmecsci.2024.109861","DOIUrl":"10.1016/j.ijmecsci.2024.109861","url":null,"abstract":"<div><div>Lattice structures are lightweight and are known to exhibit excellent energy absorbing capability when subject to compressive loading. In this paper, a new analytical model for the stiffness, strength, and energy absorption of additively manufactured functionally graded lattice structures is presented, leading to the establishment of a new energy absorption optimisation approach. The influence of cell orientation, cell aspect ratio, and cell relative density on the mechanical properties is characterised. The optimal through-thickness density distribution to maximise energy absorption is determined, subject to mass and initial stiffness constraints. Energy absorption is shown experimentally to increase by up to 67.1 % via tailored through-thickness grading of the structure's relative density. Finite element models are also developed to accurately describe the mechanical performance of these functionally graded lattice structures. These models provide valuable insight into the properties of functionally graded lattice structures and can serve as a basis for the tailored design of lightweight energy absorbers.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"285 ","pages":"Article 109861"},"PeriodicalIF":7.1,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756912","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}
Pub Date : 2024-11-28DOI: 10.1016/j.ijmecsci.2024.109848
Hao You, Shoujing Zheng, K.Y. Lam, Hua Li
This paper presents a new framework for investigating the impact of heterogeneity levels on the fracture properties of hydrogels, offering guidelines for the application of heterogeneous structure design principles. The study reveals that heterogeneous hydrogel structures generated by higher inhomogeneity levels exhibit increased fracture toughness compared to homogeneous ones, though excessively large values can diminish performance. Hydrogels with an optimal value of 1 statistically demonstrate superior fracture toughness. The framework integrates a multiresolution community detection algorithm, enabling the analysis of graph properties at the community scale. The findings suggest that the fracture toughness of hydrogels may be associated with a trade-off between the average community distance and the average community degree. The model successfully predicts stretch–stress curves and crack traces with high accuracy, providing a foundation for future applications such as image-based machine learning. Additionally, case studies demonstrate the adaptability of the method to multi-axial loading conditions and three-dimensional scenarios. Overall, this work provides a robust platform for advancing the understanding of hydrogels and fracture properties.
{"title":"Heterogeneous hydrogel fracture simulation study using community detection","authors":"Hao You, Shoujing Zheng, K.Y. Lam, Hua Li","doi":"10.1016/j.ijmecsci.2024.109848","DOIUrl":"10.1016/j.ijmecsci.2024.109848","url":null,"abstract":"<div><div>This paper presents a new framework for investigating the impact of heterogeneity levels on the fracture properties of hydrogels, offering guidelines for the application of heterogeneous structure design principles. The study reveals that heterogeneous hydrogel structures generated by higher inhomogeneity levels <span><math><mi>β</mi></math></span> exhibit increased fracture toughness compared to homogeneous ones, though excessively large <span><math><mi>β</mi></math></span> values can diminish performance. Hydrogels with an optimal <span><math><mi>β</mi></math></span> value of 1 statistically demonstrate superior fracture toughness. The framework integrates a multiresolution community detection algorithm, enabling the analysis of graph properties at the community scale. The findings suggest that the fracture toughness of hydrogels may be associated with a trade-off between the average community distance and the average community degree. The model successfully predicts stretch–stress curves and crack traces with high accuracy, providing a foundation for future applications such as image-based machine learning. Additionally, case studies demonstrate the adaptability of the method to multi-axial loading conditions and three-dimensional scenarios. Overall, this work provides a robust platform for advancing the understanding of hydrogels and fracture properties.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"286 ","pages":"Article 109848"},"PeriodicalIF":7.1,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748333","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}
Pub Date : 2024-11-25DOI: 10.1016/j.ijmecsci.2024.109858
Chuhan Wu , Liangchi Zhang
This paper presents a novel integrated approach to modeling surface texture transfer in skin-pass rolling under mixed elasto-plasto-hydrodynamic lubrication (EPHL). The innovation lies in combining discrete fast Fourier transform (DC-FFT) for precise characterisation of elastically deformed asperities on the roll surface, dynamic explicit finite element analysis (FEA) for capturing cross-scale deformations, and a transient average Reynolds equation for governing the lubrication flow. By integrating these methods, the model addresses the complex interplay between elastic roll deformation, microscale asperity-lubricant interactions, and elastoplastic strip deformation, providing a more comprehensive understanding of texture transfer mechanisms. In addition, the model predictions are validated by experimental results. Furthermore, this study investigates the effects of rolling speed and surface pattern orientation, revealing that higher speeds reduce texture transfer while surface patterns aligned with the rolling direction enhance it. These insights demonstrate the potential of this integrated modeling approach for advancing the field of skin-pass rolling.
{"title":"Surface texture transfer in skin-pass rolling under mixed lubrication","authors":"Chuhan Wu , Liangchi Zhang","doi":"10.1016/j.ijmecsci.2024.109858","DOIUrl":"10.1016/j.ijmecsci.2024.109858","url":null,"abstract":"<div><div>This paper presents a novel integrated approach to modeling surface texture transfer in skin-pass rolling under mixed elasto-plasto-hydrodynamic lubrication (EPHL). The innovation lies in combining discrete fast Fourier transform (DC-FFT) for precise characterisation of elastically deformed asperities on the roll surface, dynamic explicit finite element analysis (FEA) for capturing cross-scale deformations, and a transient average Reynolds equation for governing the lubrication flow. By integrating these methods, the model addresses the complex interplay between elastic roll deformation, microscale asperity-lubricant interactions, and elastoplastic strip deformation, providing a more comprehensive understanding of texture transfer mechanisms. In addition, the model predictions are validated by experimental results. Furthermore, this study investigates the effects of rolling speed and surface pattern orientation, revealing that higher speeds reduce texture transfer while surface patterns aligned with the rolling direction enhance it. These insights demonstrate the potential of this integrated modeling approach for advancing the field of skin-pass rolling.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"286 ","pages":"Article 109858"},"PeriodicalIF":7.1,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756681","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}
Piezoelectric actuators have gained widespread attention for their quick response, low energy consumption, and resistance to electromagnetic interference. However, current piezoelectric actuators face challenges in achieving large stepping displacement within compact spaces owing to the small output of individual piezoelectric elements. To address this issue, a stick-slip piezoelectric actuator based on the lever and triangular coupling amplification principle is proposed in this study. The improved lever and triangular amplification mechanisms significantly enhance the forward displacement during the stick stage. Owing to the unique slender flexible driving foot design of the triangular amplification section, the coupled triangular amplification mechanism can store elastic potential energy during the stick stage without compromising structural compactness. This energy is then released during the slip stage to counteract the sliding friction, enabling the actuator to achieve a sudden increase in characteristics. The displacement amplification effect of the flexible hinge mechanism is examined through theoretical calculations and simulations. The experimental results confirm that the proposed actuator can achieve large stepping displacement and high stepping performance factors under low-frequency conditions. Specifically, at a voltage of 100 V and frequency of 10 Hz, the stepping displacement and stepping performance factor reached 144 μm and 1.44 μm/V, respectively. Owing to the increased stepping displacement, the actuator achieved a maximum speed of 99.1 mm/s at 800 Hz. These features demonstrate the tremendous potential of the proposed actuator in various applications.
{"title":"A stick-slip piezoelectric actuator with large stepping displacement","authors":"Zhaochen Ding, Xiaoqin Zhou, Zhi Xu, Qiang Liu, Jingshi Dong, Huadong Yu","doi":"10.1016/j.ijmecsci.2024.109850","DOIUrl":"10.1016/j.ijmecsci.2024.109850","url":null,"abstract":"<div><div>Piezoelectric actuators have gained widespread attention for their quick response, low energy consumption, and resistance to electromagnetic interference. However, current piezoelectric actuators face challenges in achieving large stepping displacement within compact spaces owing to the small output of individual piezoelectric elements. To address this issue, a stick-slip piezoelectric actuator based on the lever and triangular coupling amplification principle is proposed in this study. The improved lever and triangular amplification mechanisms significantly enhance the forward displacement during the stick stage. Owing to the unique slender flexible driving foot design of the triangular amplification section, the coupled triangular amplification mechanism can store elastic potential energy during the stick stage without compromising structural compactness. This energy is then released during the slip stage to counteract the sliding friction, enabling the actuator to achieve a sudden increase in characteristics. The displacement amplification effect of the flexible hinge mechanism is examined through theoretical calculations and simulations. The experimental results confirm that the proposed actuator can achieve large stepping displacement and high stepping performance factors under low-frequency conditions. Specifically, at a voltage of 100 V and frequency of 10 Hz, the stepping displacement and stepping performance factor reached 144 μm and 1.44 μm/V, respectively. Owing to the increased stepping displacement, the actuator achieved a maximum speed of 99.1 mm/s at 800 Hz. These features demonstrate the tremendous potential of the proposed actuator in various applications.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"285 ","pages":"Article 109850"},"PeriodicalIF":7.1,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746571","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}
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