International Journal of Mechanical Sciences最新文献

英文中文

An origami-inspired low-frequency isolator with one/two-stage quasi-zero stiffness characteristics

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-02-09 DOI: 10.1016/j.ijmecsci.2025.110040

Kangfan Yu, Yunwei Chen, Chuanyun Yu, Jianrun Zhang, Xi Lu

As an emerging technology, Kresling origami exhibits rich nonlinear mechanical and kinematic properties. However, previous studies have tended to focus on one of these properties, and few have utilized its kinematic properties to design specifical mechanical properties. Inspired by the axis-rotation coupling property of Kresling origami, a novel composite anti-vibration structure (CAS) utilizing an improved cam-roller mechanism is proposed for flexible low-frequency vibration isolation. The mountain creases are simulated by rigid rods, while the valley creases are neglected to enhance the axis-rotation coupling effect as much as possible. Unlike conventional cam-roller mechanisms, the improved cam-roller mechanism overcomes the cam size limitation on working stroke and avoids friction damping of the sliding rods. By setting different cam profiles, one/two-stage quasi-zero stiffness (QZS) characteristics with wide QZS ranges can be achieved, thus enabling passive variable loading of CAS. Considering the nonlinear inertia induced by the rotating platform, the dynamic equations of CAS are established using Lagrange principle. And the Alternating frequency–time harmonic balance method is used to solve the equations, which avoids the fitting error caused by Taylor's formula. The effects of nonlinear inertia, equilibrium position, excitation amplitude, and damping on vibration isolation performance of the CAS are analyzed. It is found that changes in excitation amplitude and equilibrium position affect both nonlinear stiffness and inertia, thus affecting vibration isolation performance. Comparative discussions demonstrate CAS has wider QZS ranges and weaker stiffness nonlinearity than typical QZS isolators, X-shaped isolators, and linear isolators, which leads to superior low-frequency vibration isolation at large excitations. Both static and dynamic experiments verify the accuracy of the theoretical analysis, confirming wide QZS range and excellent low-frequency vibration isolation performance of CAS. This work presents a simple, feasible low-frequency vibration isolation scheme that may promote practical engineering applications of origami and cam-roller structures.

{"title":"An origami-inspired low-frequency isolator with one/two-stage quasi-zero stiffness characteristics","authors":"Kangfan Yu, Yunwei Chen, Chuanyun Yu, Jianrun Zhang, Xi Lu","doi":"10.1016/j.ijmecsci.2025.110040","DOIUrl":"10.1016/j.ijmecsci.2025.110040","url":null,"abstract":"<div><div>As an emerging technology, Kresling origami exhibits rich nonlinear mechanical and kinematic properties. However, previous studies have tended to focus on one of these properties, and few have utilized its kinematic properties to design specifical mechanical properties. Inspired by the axis-rotation coupling property of Kresling origami, a novel composite anti-vibration structure (CAS) utilizing an improved cam-roller mechanism is proposed for flexible low-frequency vibration isolation. The mountain creases are simulated by rigid rods, while the valley creases are neglected to enhance the axis-rotation coupling effect as much as possible. Unlike conventional cam-roller mechanisms, the improved cam-roller mechanism overcomes the cam size limitation on working stroke and avoids friction damping of the sliding rods. By setting different cam profiles, one/two-stage quasi-zero stiffness (QZS) characteristics with wide QZS ranges can be achieved, thus enabling passive variable loading of CAS. Considering the nonlinear inertia induced by the rotating platform, the dynamic equations of CAS are established using Lagrange principle. And the Alternating frequency–time harmonic balance method is used to solve the equations, which avoids the fitting error caused by Taylor's formula. The effects of nonlinear inertia, equilibrium position, excitation amplitude, and damping on vibration isolation performance of the CAS are analyzed. It is found that changes in excitation amplitude and equilibrium position affect both nonlinear stiffness and inertia, thus affecting vibration isolation performance. Comparative discussions demonstrate CAS has wider QZS ranges and weaker stiffness nonlinearity than typical QZS isolators, X-shaped isolators, and linear isolators, which leads to superior low-frequency vibration isolation at large excitations. Both static and dynamic experiments verify the accuracy of the theoretical analysis, confirming wide QZS range and excellent low-frequency vibration isolation performance of CAS. This work presents a simple, feasible low-frequency vibration isolation scheme that may promote practical engineering applications of origami and cam-roller structures.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"289 ","pages":"Article 110040"},"PeriodicalIF":7.1,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419825","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

Turbulent melt lubrication and current-carrying dynamic characterizations of the contact interface under magneto-thermal effect

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-02-09 DOI: 10.1016/j.ijmecsci.2025.110052

Guiwen Liao , Yu Feng , Kai Wu , Shaolei Wu , Qi Chen , Wei Wang

Under high-speed and high-temperature current-carrying conditions, turbulence in the metal liquefaction layer significantly influences friction interface performance, especially in a magneto-thermal shock environment. The interplay between turbulence and interface roughness complicates the dynamic behavior of hybrid lubrication and electrical contact. To explore the underlying mechanisms, this study constructs a turbulent melt lubrication model by integrating magnetic, temperature, and tribological calculations using the finite difference method (FDM). The findings reveal that armature velocity variations notably affect interface heat distribution, causing melt waves to propagate along the contact interface. As working conditions change, the primary heat source at the interface shifts from Joule heat to a combination of viscous and Joule heat (63.81 % and 36.19 %, respectively), demonstrating the complexity of the energy conversion process. Notably, the formation of a metal liquefied layer reduces the coefficient of friction and alters the lubrication state, which is crucial for optimizing the performance of electromagnetic launching system (EMLs).

{"title":"Turbulent melt lubrication and current-carrying dynamic characterizations of the contact interface under magneto-thermal effect","authors":"Guiwen Liao , Yu Feng , Kai Wu , Shaolei Wu , Qi Chen , Wei Wang","doi":"10.1016/j.ijmecsci.2025.110052","DOIUrl":"10.1016/j.ijmecsci.2025.110052","url":null,"abstract":"<div><div>Under high-speed and high-temperature current-carrying conditions, turbulence in the metal liquefaction layer significantly influences friction interface performance, especially in a magneto-thermal shock environment. The interplay between turbulence and interface roughness complicates the dynamic behavior of hybrid lubrication and electrical contact. To explore the underlying mechanisms, this study constructs a turbulent melt lubrication model by integrating magnetic, temperature, and tribological calculations using the finite difference method (FDM). The findings reveal that armature velocity variations notably affect interface heat distribution, causing melt waves to propagate along the contact interface. As working conditions change, the primary heat source at the interface shifts from Joule heat to a combination of viscous and Joule heat (63.81 % and 36.19 %, respectively), demonstrating the complexity of the energy conversion process. Notably, the formation of a metal liquefied layer reduces the coefficient of friction and alters the lubrication state, which is crucial for optimizing the performance of electromagnetic launching system (EMLs).</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"289 ","pages":"Article 110052"},"PeriodicalIF":7.1,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419827","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

Characteristics of multiple cavitations near plate structures in underwater explosions

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-02-08 DOI: 10.1016/j.ijmecsci.2025.110047

Yifan Zhang , Liangtao Liu , Jinxiang Wang , Kun Liu , Xiwen Chen , Niannian Liu

Multiple cavitations generated by near-field underwater explosions can cause significant structural damage, and its generation mechanisms and evolutionary characteristics are still unclear. Therefore, the characteristics of multiple cavitations near plates in underwater explosions are investigated experimentally and numerically. Multiple cavitations near air-backed plates with varying impedances are explored experimentally through a cavitation apparatus, and the effectiveness of Arbitrary Lagrangian–Eulerian method considering multiple cavitations in underwater explosions is validated by the experimental results. Based on the numerical method, the generation processes and evolutionary characteristics of multiple cavitations near air-backed plates at different detonation distances and near water-backed plates with different impedances are analyzed, where the influences of the explosion shock wave and bubble dynamics on evolutionary characteristics of multiple cavitations are commendably elucidated. On the basis of the liquid pressure and structural velocity, the generation mechanisms of multiple cavitations near the structure have also been well revealed. The results indicate that: Ⅰ. The first cavitation is mainly caused by rarefaction wave reflections or transmissions from the structure, which collapses quickly. The second cavitation is driven by negative pressure from liquid stretching due to structural oscillations, which collapses more slowly. Ⅱ. For air-backed plates, decreasing structural impedance increases the first cavitation diameter and delays second cavitation. Smaller detonation distances result in larger diameters and longer durations for cavitations. Ⅲ. For water-backed plates, when impedance is lower than water, cavitation diameters and durations increase as impedance decreases. However, when impedance exceeds water's, cavitation generation becomes difficult. Ⅳ. The third cavitation follows similar generation and evolution patterns as the second. These findings provide theoretical and technical support for revealing the complex mechanical mechanisms in near-field underwater explosions.

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引用次数: 0

Deposition mechanism of microscopic impacting droplets on flexible porous substrates

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-02-07 DOI: 10.1016/j.ijmecsci.2025.110050

Yankang Zhang , Zhe Li , Lin Li , Chengyan Wang , Jiafeng Wu , Yuanshen Xie , Zichao Yin , Dapeng Tan

Flexible and breathable porous pressure sensors are gaining attention due to their potential in wearable devices for human motion monitoring. The controllable deposition and transport of droplets on porous surfaces are critical for achieving high - conductivity printing in flexible and wearable sensors, as well as in electronic applications. Due to the intricate microstructure of porous layers, accurately dynamically tracking alterations in droplet morphology and the detailed characterization of multiphase-coupled transport present significant challenges. To address these issues, this study employs a microscopic multiphase-coupled transport dynamics model based on the volume-of-fluid smoothing correction and the Kistler dynamic contact angle model (VOFS-KCA). The aim is to investigate the evolution of droplet transport on both the external surface and internal pore spaces of porous media. Furthermore, it reveals the correlation between the structural characteristics of porous media and the mass transfer process in multiphase flow. Results show that the wettability of porous surfaces is a pivotal factor in droplet clusters' dispersion and mobility. The effect of porosity on droplet penetration is nonlinear. Appropriate porosity is conducive to droplet penetration on the porous surface, while excessive porosity leads to lateral diffusion in the cavity. A smaller fiber diameter leads to an approximately circular and uniform distribution of droplets on the porous surface and reduces permeability, which is conducive to maintaining the linewidth of the printed circuit and improving the conductivity. This study systematically explores how surface wettability, porosity, and fiber structure affect droplet dispersion and infiltration, providing new insights into the design of high-performance porous systems. This work lays the foundation for the high-precision manufacturing of flexible sensors with porous surfaces, with applications in energy storage, filtration, and biomedical systems.

{"title":"Deposition mechanism of microscopic impacting droplets on flexible porous substrates","authors":"Yankang Zhang , Zhe Li , Lin Li , Chengyan Wang , Jiafeng Wu , Yuanshen Xie , Zichao Yin , Dapeng Tan","doi":"10.1016/j.ijmecsci.2025.110050","DOIUrl":"10.1016/j.ijmecsci.2025.110050","url":null,"abstract":"<div><div>Flexible and breathable porous pressure sensors are gaining attention due to their potential in wearable devices for human motion monitoring. The controllable deposition and transport of droplets on porous surfaces are critical for achieving high - conductivity printing in flexible and wearable sensors, as well as in electronic applications. Due to the intricate microstructure of porous layers, accurately dynamically tracking alterations in droplet morphology and the detailed characterization of multiphase-coupled transport present significant challenges. To address these issues, this study employs a microscopic multiphase-coupled transport dynamics model based on the volume-of-fluid smoothing correction and the Kistler dynamic contact angle model (VOFS-KCA). The aim is to investigate the evolution of droplet transport on both the external surface and internal pore spaces of porous media. Furthermore, it reveals the correlation between the structural characteristics of porous media and the mass transfer process in multiphase flow. Results show that the wettability of porous surfaces is a pivotal factor in droplet clusters' dispersion and mobility. The effect of porosity on droplet penetration is nonlinear. Appropriate porosity is conducive to droplet penetration on the porous surface, while excessive porosity leads to lateral diffusion in the cavity. A smaller fiber diameter leads to an approximately circular and uniform distribution of droplets on the porous surface and reduces permeability, which is conducive to maintaining the linewidth of the printed circuit and improving the conductivity. This study systematically explores how surface wettability, porosity, and fiber structure affect droplet dispersion and infiltration, providing new insights into the design of high-performance porous systems. This work lays the foundation for the high-precision manufacturing of flexible sensors with porous surfaces, with applications in energy storage, filtration, and biomedical systems.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"288 ","pages":"Article 110050"},"PeriodicalIF":7.1,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377448","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

Locally activated 4D printing with programmable shapes and properties

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-02-06 DOI: 10.1016/j.ijmecsci.2025.110038

Xueli Zhou , Chubang Tian , Jifeng Zhang , Luquan Ren , Lei Ren

This study innovatively proposes a locally activated magnetically responsive 4D printing strategy to solve the problem of local deformation of magnetic shape memory composites. The local activation scheme is designed to precisely regulate the thermal activation area and magnetic field parameters, and the deformation behavior of the composites can be finely controlled. In addition, the strategy is applied to the shape tuning of the dome and chiral structures, which realizes the intelligent programming of structural energy absorption properties. This study opens up new avenues for the design and fabrication of adaptive and reconfigurable active mechanical metamaterials, minimally invasive medical implantable devices, and flexible electronic devices.

引用次数: 0

Stepwise self-oscillation of a photo-oscillator via time delay

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-02-06 DOI: 10.1016/j.ijmecsci.2025.110046

Zhuangzhuang Zhang, Xinyan Jiang, Yunlong Qiu, Kai Li

Self-oscillating systems, characterized by ambient-energy-supply and self-control, can absorb energy from steady environment to sustain continuous motion, whereas traditional self-oscillations rely on inertia and require rapid response to excitations. This study introduces a time-delay mechanism to experimentally design a photo-oscillator based on liquid crystal elastomers (LCEs), demonstrating stepwise self-oscillation without requiring a rapid response of the LCE to stimuli. The time delay is realized using a bistable seesaw system and is explained through the time history of the stepwise self-oscillation. Through quasi-static analysis, critical positions determined by geometric conditions are calculated, revealing the photo-oscillator alternates continuously between two stable states. Furthermore, the influence of system parameters on the critical contraction and period is investigated. Unlike many existing self-oscillating systems, the proposed photo-oscillator features a simple structure, a wide controllable oscillation period, and minimal requirements, relying only on small-area line illumination. The findings of this study hold promise for expanding design concepts applicable to soft robotics, sensors, and energy harvesters.

{"title":"Stepwise self-oscillation of a photo-oscillator via time delay","authors":"Zhuangzhuang Zhang, Xinyan Jiang, Yunlong Qiu, Kai Li","doi":"10.1016/j.ijmecsci.2025.110046","DOIUrl":"10.1016/j.ijmecsci.2025.110046","url":null,"abstract":"<div><div>Self-oscillating systems, characterized by ambient-energy-supply and self-control, can absorb energy from steady environment to sustain continuous motion, whereas traditional self-oscillations rely on inertia and require rapid response to excitations. This study introduces a time-delay mechanism to experimentally design a photo-oscillator based on liquid crystal elastomers (LCEs), demonstrating stepwise self-oscillation without requiring a rapid response of the LCE to stimuli. The time delay is realized using a bistable seesaw system and is explained through the time history of the stepwise self-oscillation. Through quasi-static analysis, critical positions determined by geometric conditions are calculated, revealing the photo-oscillator alternates continuously between two stable states. Furthermore, the influence of system parameters on the critical contraction and period is investigated. Unlike many existing self-oscillating systems, the proposed photo-oscillator features a simple structure, a wide controllable oscillation period, and minimal requirements, relying only on small-area line illumination. The findings of this study hold promise for expanding design concepts applicable to soft robotics, sensors, and energy harvesters.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"288 ","pages":"Article 110046"},"PeriodicalIF":7.1,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377447","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

Low-frequency broadband metamaterials for ventilated acoustic insulation

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-02-05 DOI: 10.1016/j.ijmecsci.2025.110044

Hao-Bo Qi , Shi-Wang Fan , Mu Jiang , Zhu Tong , Badreddine Assouar , Yue-Sheng Wang

Achieving effective sound insulation across a broadband range at low frequency while ensuring sufficient ventilation remains a significant challenge in the field of acoustic engineering, as there exist complex trade-offs in attenuation capacity, operating frequency, and opening size. Here, a double Archimedean spiral structure is proposed and then optimized using genetic algorithms. The sparse design, featuring ventilated channels on both sides of the unit, significantly expands the operational frequency range, effectively blocking over 80 % of incident energy within the 546–1575 Hz range. Its working mechanism can be attributed to the Fano-like resonance effect, which is further revealed by employing a mechanical analogy based on the spring-mass model. Moreover, the addition of foams and a reconfigurable modular assembly enhances both broadband sound reduction and flexibility. Consistency between numerical simulations and experimental results validate the potential for this approach in applications of ventilated acoustic insulation, offering advantageous theoretical and practical perspectives.

{"title":"Low-frequency broadband metamaterials for ventilated acoustic insulation","authors":"Hao-Bo Qi , Shi-Wang Fan , Mu Jiang , Zhu Tong , Badreddine Assouar , Yue-Sheng Wang","doi":"10.1016/j.ijmecsci.2025.110044","DOIUrl":"10.1016/j.ijmecsci.2025.110044","url":null,"abstract":"<div><div>Achieving effective sound insulation across a broadband range at low frequency while ensuring sufficient ventilation remains a significant challenge in the field of acoustic engineering, as there exist complex trade-offs in attenuation capacity, operating frequency, and opening size. Here, a double Archimedean spiral structure is proposed and then optimized using genetic algorithms. The sparse design, featuring ventilated channels on both sides of the unit, significantly expands the operational frequency range, effectively blocking over 80 % of incident energy within the 546–1575 Hz range. Its working mechanism can be attributed to the Fano-like resonance effect, which is further revealed by employing a mechanical analogy based on the spring-mass model. Moreover, the addition of foams and a reconfigurable modular assembly enhances both broadband sound reduction and flexibility. Consistency between numerical simulations and experimental results validate the potential for this approach in applications of ventilated acoustic insulation, offering advantageous theoretical and practical perspectives.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"289 ","pages":"Article 110044"},"PeriodicalIF":7.1,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453869","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

Design of modular deployable structure with programmable multistability

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-02-05 DOI: 10.1016/j.ijmecsci.2025.110037

Fengrui Liu , Tatsuro Terakawa , Ji Lin , Masaharu Komori

Origami-inspired deployable structures have extreme compactness and design flexibility, suitable for aerospace structures, disaster relief robots, and medical devices. However, due to the lack of rigid-foldability, many origami applications rely on soft materials, limiting their load-bearing capacity and range of applications. To address this issue, this study proposes an origami design called Foldable Cube origami (FC-ori), which allows a cube to be rigidly folded into a square. By adding a translational degree of freedom along the rotational axis on some creases, FC-ori effectively mitigates the effects of thickness while preserving both rigid and flat foldability. By attaching various magnets and springs, an FC-ori unit can exhibit programmable multistability. Utilizing these units, we designed a modular, deployable mobile robot that can adapt to various terrains and tasks by transforming its configuration, demonstrating the potential of FC-ori in rigid origami applications.

引用次数: 0

Micro-mechanism of mechanical enhancement of NiTiAl amorphous-crystal nanomultilayers

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-02-04 DOI: 10.1016/j.ijmecsci.2025.110020

Yuanwei Pu , Yongchao Liang , Yu Zhou , Qian Chen , Tinghong Gao , Lili Zhou , Zean Tian

Amorphous-crystal nanomultilayers (ACNMs) exhibit outstanding mechanical properties, but the micro-mechanisms responsible for the enhancement of their mechanical performance remain incompletely understood. Molecular dynamics (MD) simulations were performed on the tensile processes of NiTiAl ACNMs to examine the microstructure evolutions during deformation in crystals, amorphous (MGs), and crystal-amorphous interfaces (CAIs). ACNMs increase in strength and decrease in plasticity with decreasing interface spacing. The MGs layer can accommodate larger strains. The intense competition among shear transformation zones (STZs) mitigates strain localization in MGs and boosts the plasticity of ACNMs. In the crystal layer, the main plastic deformation mechanism is that FCC clusters are disrupted and converted into other MGs clusters. As the interface spacing decreases, the geometrically constrained dispersion of STZs boosts material strength. The self-developed Largest Standard Cluster Analysis (LaSCA) method was employed to accurately depict the microstructure evolution of CAIs. The CAIs are responsible for strain transmission and induce dislocation accumulation in their vicinity, leading to localized strain. This study elucidates the microstructural changes in ACNMs during tensile deformation, offering insights for optimizing their mechanical properties through interface spacing design.

{"title":"Micro-mechanism of mechanical enhancement of NiTiAl amorphous-crystal nanomultilayers","authors":"Yuanwei Pu , Yongchao Liang , Yu Zhou , Qian Chen , Tinghong Gao , Lili Zhou , Zean Tian","doi":"10.1016/j.ijmecsci.2025.110020","DOIUrl":"10.1016/j.ijmecsci.2025.110020","url":null,"abstract":"<div><div>Amorphous-crystal nanomultilayers (ACNMs) exhibit outstanding mechanical properties, but the micro-mechanisms responsible for the enhancement of their mechanical performance remain incompletely understood. Molecular dynamics (MD) simulations were performed on the tensile processes of NiTiAl ACNMs to examine the microstructure evolutions during deformation in crystals, amorphous (MGs), and crystal-amorphous interfaces (CAIs). ACNMs increase in strength and decrease in plasticity with decreasing interface spacing. The MGs layer can accommodate larger strains. The intense competition among shear transformation zones (STZs) mitigates strain localization in MGs and boosts the plasticity of ACNMs. In the crystal layer, the main plastic deformation mechanism is that FCC clusters are disrupted and converted into other MGs clusters. As the interface spacing decreases, the geometrically constrained dispersion of STZs boosts material strength. The self-developed Largest Standard Cluster Analysis (LaSCA) method was employed to accurately depict the microstructure evolution of CAIs. The CAIs are responsible for strain transmission and induce dislocation accumulation in their vicinity, leading to localized strain. This study elucidates the microstructural changes in ACNMs during tensile deformation, offering insights for optimizing their mechanical properties through interface spacing design.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"288 ","pages":"Article 110020"},"PeriodicalIF":7.1,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378624","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

Dynamic modeling and analysis for dielectric elastomer tube actuators

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-02-03 DOI: 10.1016/j.ijmecsci.2025.109994

Yuqing Guo , Liang Li , Dingguo Zhang , Wei-Hsin Liao

Dielectric elastomer tubular actuators (DETA) as a new type of smart material actuator, has attracted wide attention in recent years. Its basic working principle is to use the deformation generated by dielectric elastomers (DEs) under the electric field to achieve the actuation function. Compared with the traditional actuators, DETA has the advantages of high energy density, fast response, simple structure, lightweight, soft and large deformation. In engineering applications, good structural design can improve the efficiency of actuation, reduce energy loss and prolong service life. The purpose of this paper is to explore the electromechanical coupling principle of DETA. Based on the Absolute Nodal Coordinate Formulation (ANCF), we use the electromechanically coupled 8-node hexahedral element, and consider the viscoelastic properties of the material to derive the dynamic equations of the flexible system containing DETA. Subsequently, the static and dynamic behaviors of the system are studied, and the correctness and validity of the method proposed in this work are verified by comparing with the experimental results. The research in this paper not only enriches the modeling and theoretical analysis of DEs, but also provides new ideas and methods for its application.

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