Journal of Applied Mechanics-Transactions of the Asme最新文献_第3页

The Dynamic Energy-Momentum Tensor and the Logarithmic Singularity of a Generally Accelerating Edge Dislocation 一般加速边位错的动态能量-动量张量和对数奇异性

4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-09-11 DOI: 10.1115/1.4062629

Luqun Ni, Xanthippi Markenscoff

引用次数: 0

A comparative study of the entanglement models toward simulating hyperelastic behaviors 模拟超弹性行为的纠缠模型的比较研究

IF 2.6 4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-09-06 DOI: 10.1115/1.4063348

Lingrui Zhu, Lin Zhan, Rui Xiao

{"title":"A comparative study of the entanglement models toward simulating hyperelastic behaviors","authors":"Lingrui Zhu, Lin Zhan, Rui Xiao","doi":"10.1115/1.4063348","DOIUrl":"https://doi.org/10.1115/1.4063348","url":null,"abstract":"\u0000 Accurately predicting the hyperelastic response of soft materials under complex loading conditions has been a long-standing challenge. Previous developments have shown that incorporating the entanglement effect can significantly improve the model performance. In this work, we compare the performances of different entanglement models in simulating the stress responses through either fitting uniaxial data alone or uniaxial and equibiaxial data simultaneously. Results show that the entanglement models do not exhibit satisfactory predictive ability with parameters calibrated through uniaxial data. This disadvantage can be overcome through a newly proposed Biot chain model, which inherently incorporates the entanglement effect though a new chain stretch determination that considers the contribution of all surrounding chains. As multiple pairs of experimental data are used to calibrate the model parameter, the Davidson-Goulbourne model provides the best performance. It is also demonstrated that the entanglement effect varies with the deformation mode and plays a more critical role in biaxial deformation than that in the uniaxial deformation. This study can provide a better understanding of entanglement models, including their capabilities and limitations, facilitating the development of more accurate and reliable predictive models toward various applications.","PeriodicalId":54880,"journal":{"name":"Journal of Applied Mechanics-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49033915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Inertia Modulated Meta-structure with Time-Varying Inertia Amplification 具有时变惯性放大的惯性调制元结构

IF 2.6 4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-09-06 DOI: 10.1115/1.4063347

Hao Gao, Junzhe Zhu, Y. Qu, Guang Meng

引用次数: 0

Effect of electrode on the dynamics of electroactive membrane 电极对电活性膜动力学的影响

IF 2.6 4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-09-06 DOI: 10.1115/1.4063346

R. Ranjan, S. Sarangi

{"title":"Effect of electrode on the dynamics of electroactive membrane","authors":"R. Ranjan, S. Sarangi","doi":"10.1115/1.4063346","DOIUrl":"https://doi.org/10.1115/1.4063346","url":null,"abstract":"\u0000 The dynamics of the electroactive membranes are being studied extensively due to their vast application at the current time. However, the effect of the mechanical behavior of the compliant electrode needs to be addressed. This paper presents the non-linear analysis of an electrically actuated membrane, considering the inertia of the electrode. The membrane is modeled as a hyperelastic material and is assumed to be incompressible, homogeneous, and isotropic. The proposed analysis is discussed in a generalized way for both the compression and suspension phases. Since the membrane is vulnerable to pull-in instability, the conditions to prevent electromechanical instability are defined. Further, an analytical relation is established for breakdown voltage and is validated with experimental data. The analytical solution of axial vibration is presented in the form of elliptic integrals and by the use of multiple scale method in a generalised way for both the phases. The resultant motions and their various physical aspects under suspension and compression phases for general initial conditions are described through graphical results to comprehend the proposed analysis. Also, parameter values are quantified analytically, for which the system executes reverse behaviour in a given configuration.","PeriodicalId":54880,"journal":{"name":"Journal of Applied Mechanics-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46831279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Spatial Variation of the Coefficient of Restitution for Frictionless Impacts on Circular Beams 圆梁无摩擦碰撞恢复系数的空间变异

IF 2.6 4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-08-23 DOI: 10.1115/1.4063218

Aakash Khandelwal, R. Mukherjee

引用次数: 0

Thermomechanical Coupling in Polydomain Liquid Crystal Elastomers 多畴液晶弹性体的热机械耦合

IF 2.6 4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-08-23 DOI: 10.1115/1.4063219

Zhengxuan Wei, Peixun Wang, Ruobing Bai

{"title":"Thermomechanical Coupling in Polydomain Liquid Crystal Elastomers","authors":"Zhengxuan Wei, Peixun Wang, Ruobing Bai","doi":"10.1115/1.4063219","DOIUrl":"https://doi.org/10.1115/1.4063219","url":null,"abstract":"\u0000 Liquid crystal elastomers (LCEs) are made of liquid crystal molecules linked into rubber-like polymer networks. An LCE exhibits both the thermotropic property of liquid crystals and large deformation of elastomers. It can be monodomain or polydomain in the nematic phase and transforms to an isotropic phase at elevated temperature. These features have enabled various applications of LCEs in robotics and other fields. However, despite substantial research and development in recent years, thermomechanical coupling in polydomain LCEs remains poorly studied, such as their temperature-dependent mechanical response and stretch-influenced isotropic-nematic phase transition. This knowledge gap limits the fundamental understanding of the structure-property relationship, as well as future developments of LCEs with precisely controlled material behaviors. Here we construct a theoretical model to investigate thermomechanical coupling in polydomain LCEs, which includes a quasi-convex elastic energy of the polymer network and a free energy of mesogens. We study working conditions where a polydomain LCE is subjected to various prescribed planar stretches and temperatures. The quasi-convex elastic energy enables a “mechanical phase diagram” that describes the macroscopic effective mechanical response of the material, and the free energy of mesogens governs their first-order nematic-isotropic phase transition. Evolution of the mechanical phase diagram and the order parameter with temperature is predicted and discussed. Temperature-dependent mechanical behaviors of the polydomain LCE that have never been reported before are shown in their stress-stretch curves. These results are hoped to motivate future fundamental studies and applications of thermomechanical LCEs.","PeriodicalId":54880,"journal":{"name":"Journal of Applied Mechanics-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44179931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Single and Double Cantilever Beam Large Displacement Mixed Mode Fracture Toughness Test Methods and J-integral Analyses 单、双悬臂梁大位移混合模式断裂韧性试验方法及J积分分析

IF 2.6 4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-08-23 DOI: 10.1115/1.4063216

A. Paris

{"title":"Single and Double Cantilever Beam Large Displacement Mixed Mode Fracture Toughness Test Methods and J-integral Analyses","authors":"A. Paris","doi":"10.1115/1.4063216","DOIUrl":"https://doi.org/10.1115/1.4063216","url":null,"abstract":"The J-integral is applied to the single cantilever beam (SCB) and double cantilever beam (DCB) test specimens subjected to both mixed mode I and II loading and large displacements. The methods proposed and resulting closed form theoretical equations allow for the instantaneous evaluation of J during laboratory tests, requiring only the applied load and angular rotation of the specimen loading link, loading points and remaining ligament. These measurands can be acquired using a common load cell and markers, digital video camera, and video analysis software. In general, the equations do require knowledge of the specimen elastic moduli and shear moduli, as well as the specimen linear dimensions. Since the test data can be analyzed and J determined throughout the test instantaneously, and since, due to geometric non-linearities, the ratio of mode I and mode II loading will likely vary significantly throughout the test, each specimen can be used to generate multiple data points. If crack length is determined throughout the test, presumably by directly measuring the crack length optically, then when the crack advances, critical values of J for mixed mode loading can be determined using the methods and results presented. It is noted that moderate to large translational and rotational displacements actually improve the accuracy of the results using these methods. The results are applicable to standard purely mode I or purely mode II SCB and DCB tests as well and reduce to known equations in those special cases.","PeriodicalId":54880,"journal":{"name":"Journal of Applied Mechanics-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44490754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Cellular mechanics of finger-like structures of collective cell migration 细胞集体迁移指状结构的细胞力学

IF 2.6 4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-08-23 DOI: 10.1115/1.4063217

Xiangyu Xu, Jiayi Xu, Jie Liu, Chaohui Jiang, Liangfei Tian, Yingke Xu, Dechang Li, B. Ji

{"title":"Cellular mechanics of finger-like structures of collective cell migration","authors":"Xiangyu Xu, Jiayi Xu, Jie Liu, Chaohui Jiang, Liangfei Tian, Yingke Xu, Dechang Li, B. Ji","doi":"10.1115/1.4063217","DOIUrl":"https://doi.org/10.1115/1.4063217","url":null,"abstract":"\u0000 Finger-like structures take crucial roles in migration behaviors of collective cells. However, the mechanics of the finger-like structure has not been fully understood. Here, we constructed a two-dimensional collective cell migration model, and quantitatively analyzed the cellular mechanics of finger-like structures during the collective cell migration through experimental study and numerical simulation. We found that substrate stiffness, cell density, cell prestress, and mechanical loading significantly influence the generation and behaviors of the finger-like structures through regulating the lamellipodia spreading area, cellular traction force, and collectivity of cell motility. We showed that the regions with the higher maximum principal stress tend to produce larger finger-like structures. Increasing the spreading area of lamellipodia and the velocity of leader cells could promote the generation of higher finger-like structures. For a quantitative understanding of the mechanisms of the effects of these mechanical factors, we adopted a coarse-grained cell model based on the traction-distance law. Our numerical simulation recapitulated the cell velocity distribution, cell motility integrity, cell polarization, and the stress distribution in the cell layer observed in the experiment. These analyses reveal the cellular mechanics of the finger-like structure and its roles in collective cell migration. This study provides useful insights into the collective cell behaviors in tissue engineering and regenerative medicine for biomedical applications.","PeriodicalId":54880,"journal":{"name":"Journal of Applied Mechanics-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49067649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Rigorous Analysis of Energy Conservation during Dynamic Deployment of Elastic Thin-Shell Structures 弹性薄壳结构动力展开过程中节能的严格分析

IF 2.6 4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-08-23 DOI: 10.1115/1.4063220

F. G. Canales, S. Pellegrino

引用次数: 0

Incorporating Geometric Nonlinearity in Theoretical Modeling of Muscle-Powered Soft Robotic Bio-Actuators 基于几何非线性的肌肉动力软机器人生物执行器理论建模

IF 2.6 4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-08-10 DOI: 10.1115/1.4063146

Onur Aydin, Kenta Hirashima, M. Saif

{"title":"Incorporating Geometric Nonlinearity in Theoretical Modeling of Muscle-Powered Soft Robotic Bio-Actuators","authors":"Onur Aydin, Kenta Hirashima, M. Saif","doi":"10.1115/1.4063146","DOIUrl":"https://doi.org/10.1115/1.4063146","url":null,"abstract":"\u0000 Biohybrid actuators aim to leverage the various advantages of biological cells over artificial components to build novel compliant machines with high performance and autonomy. Significant advances have been made in bio-fabrication technologies, enabling the realization of muscle-powered bio-actuators. However, the mechanics of muscle-scaffold coupling has been relatively understudied, limiting the development of bio-actuators to intuitive or biomimetic designs. Here, we consider the case of implementing muscle-based actuation for soft robotic swimmers operating at low Reynolds number. We develop an analytical model to describe the elasto-hydrodynamic problem and identify key design parameters. Muscle contraction dynamics is characterized experimentally and the implications of nonlinear amplitude-frequency relationship of muscle-based actuation are discussed. We show that a novel bio-actuator with high performance can be developed by introducing compliant flexural mechanisms undergoing large deflection. Geometric nonlinearities are accounted for in the analysis of the force-deflection relationship for the flexural mechanism. Our results show that for expected muscle contraction forces, this novel bio-actuator can outperform previous muscle-powered swimmers by up to two orders of magnitude in swimming speed.","PeriodicalId":54880,"journal":{"name":"Journal of Applied Mechanics-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41661114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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