Mechanics Research Communications最新文献_第6页

Establishment of iterative modeling method for spherical tensegrity structure using rotational symmetry and regular polyhedron configuration 基于旋转对称和正多面体构型的球面张拉整体结构迭代建模方法的建立

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-01-01 DOI: 10.1016/j.mechrescom.2023.104217

Erina Mori , Yuta Matsumoto , Nariyuki Kawabata , Keisuke Otsuka , Kanjuro Makihara

{"title":"Establishment of iterative modeling method for spherical tensegrity structure using rotational symmetry and regular polyhedron configuration","authors":"Erina Mori , Yuta Matsumoto , Nariyuki Kawabata , Keisuke Otsuka , Kanjuro Makihara","doi":"10.1016/j.mechrescom.2023.104217","DOIUrl":"10.1016/j.mechrescom.2023.104217","url":null,"abstract":"<div><p>Tensegrity structures are attractive light-weight structures. In particular, spherical tensegrity structures are expected to be applied in various fields. This article proposes a simple method for modeling spherical tensegrities. Firstly, the nodal coordinates of the spherical tensegrity are systematically determined based on rotational symmetry and regular polyhedral configuration. This approach enables the systematic acquisition of the nodal coordinates of spherical tensegrities of all sizes by introducing a three-dimensional rotation matrix and the dihedral angle of the regular polyhedron. Secondly, the prestress ratio is determined iteratively. For the stability analysis of the spherical tensegrity, nonlinear analysis with prestress is required. For the analysis considering the prestress, a tangent stiffness matrix is applied in this study. The simple determination method enables the modeling of spherical tensegrities. The natural frequencies and mode shapes of the spherical tensegrity are identified by frequency analysis. A vibration experiment is conducted as a verification experiment. The natural frequencies from the analysis are compared to the resonance frequencies from the experiment. This comparison confirms the validity of the frequency analysis results, based on the two proposed methods.</p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0093641323001763/pdfft?md5=75f79db6d00d0f9603eaebc6b067366e&pid=1-s2.0-S0093641323001763-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138530316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Rate dependent but time independent plasticity formulation with application to sand 与速率有关但与时间无关的塑性配方，适用于砂土

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-01-01 DOI: 10.1016/j.mechrescom.2023.104242

Yannis F. Dafalias , Majid T. Manzari

引用次数: 0

An anisotropic finite strain elastoplastic model considering different plastic spin effects on the intermediate configuration 各向异性有限应变弹塑性模型，考虑中间构型的不同塑性自旋效应

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-01-01 DOI: 10.1016/j.mechrescom.2023.104241

ChunYu Meng

{"title":"An anisotropic finite strain elastoplastic model considering different plastic spin effects on the intermediate configuration","authors":"ChunYu Meng","doi":"10.1016/j.mechrescom.2023.104241","DOIUrl":"10.1016/j.mechrescom.2023.104241","url":null,"abstract":"<div><p><span>Large deformation<span> anisotropic<span> elastoplastic models have important application background and research value in engineering and materials fields. In this paper, a macroscopic phenomenological model of elastoplastic anisotropic deformation considering plastic spin is proposed. The model is based on the multiplication decomposition of </span></span></span>deformation gradient<span><span>. The free energy function is expressed as the isotropic function of the strain and the structural tensor on the </span>intermediate configuration<span>, which is a push-forward of initial configuration<span><span> by using plastic deformation gradient. Advantageously, the non-equilibrium free energy function remains invariant under the superimposed rigid </span>body rotation on the intermediate configuration, which is due to the non-uniqueness of the multiplicative decomposition of deformation gradient. However, the rate of superimposed rigid body rotation has effects on the model. The effects are discussed by considering three different spin assumptions. Numerical simulations show that the plastic spin has influence on the calculation results. Therefore, the plastic spin assumption should be carefully selected in the practical application of elastoplastic anisotropic model.</span></span></span></p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053536","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

On rotary inertia of microstuctured beams and variations thereof 论微结构梁的旋转惯性及其变化

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-12-22 DOI: 10.1016/j.mechrescom.2023.104239

Victor A. Eremeyev , Isaac Elishakoff

引用次数: 0

Buckling and folding of a ductile thin film on a rigid substrate 刚性基底上韧性薄膜的屈曲和折叠

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-12-20 DOI: 10.1016/j.mechrescom.2023.104237

Jérôme Colin

引用次数: 0

Buckling and folding of a ductile thin film on a rigid substrate 刚性基底上韧性薄膜的屈曲和折叠

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-12-20 DOI: 10.1016/j.mechrescom.2023.104237

Jérôme Colin

引用次数: 0

Kinematic Solutions and Bifurcation Analysis of Single Vertex Origami Pattern 单顶点折纸图案的运动学解法和分岔分析

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-12-20 DOI: 10.1016/j.mechrescom.2023.104238

Qian Zhang , Jianguo Cai , Xiaowei Deng , Zelun Qian , Jian Feng

引用次数: 0

Chaos identification and parameter optimization for vibration suppression in composite bistable structures 用于复合双稳态结构振动抑制的混沌识别与参数优化

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-12-16 DOI: 10.1016/j.mechrescom.2023.104236

Feng Guo, Hui Fang

{"title":"Chaos identification and parameter optimization for vibration suppression in composite bistable structures","authors":"Feng Guo, Hui Fang","doi":"10.1016/j.mechrescom.2023.104236","DOIUrl":"10.1016/j.mechrescom.2023.104236","url":null,"abstract":"<div><p><span>An innovative composite bistable system<span> (CBs) coupled of prestressed linear and buckled beams with fixed ends has been designed to enhance the damping and suppress the dynamic response. The dynamic equations of the system are derived by applying Hamilton's principle. When the amplitude of the </span></span>harmonic excitation<span><span> exceeds the critical value, the buckling beam of the bistable system enters a state of inter- and in-well combined oscillations. Chaotic motion is present. This motion disperses the vibrational energy over a wide frequency band. The vibration in the high-frequency range significantly enhances the dissipation of the viscoelastic layer, leading to an effective suppression of the system's vibration. Approximate analytical solutions and numerical validation of the chaotic and non-chaotic boundaries of the steady state vibration of the bistable system are carried out based on the harmonic balance method (HBM) and the Melnikov method. The </span>Particle Swarm Optimisation (PSO) algorithm is used to optimise system parameters for specific operating conditions. This optimisation process provides guidance for the design and improvement of CBs systems.</span></p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138689827","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

3D-printed composites with a programmable response to tension and torsion: A design guide 对拉伸和扭转具有可编程响应的 3D 打印复合材料：设计指南

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-12-13 DOI: 10.1016/j.mechrescom.2023.104232

Rita Levit, Noy Cohen

{"title":"3D-printed composites with a programmable response to tension and torsion: A design guide","authors":"Rita Levit, Noy Cohen","doi":"10.1016/j.mechrescom.2023.104232","DOIUrl":"10.1016/j.mechrescom.2023.104232","url":null,"abstract":"<div><p>3D-printed composite structures employed in applications such as soft robotics, actuators, and artificial muscles typically experience different loading and deformation modes<span> throughout their life cycle. Tailoring the mechanical properties and responses to those modes in an independent manner can significantly enhance performance. In this work, we propose a helical fiber embedded cylindrical matrix as a platform to independently tune the behavior under two loading modes — uniaxial extension without twist and torsion at a constant length. Using finite elements (FE), we study the influence of the helical geometry, the volume fraction, and the moduli of the matrix and the fiber on the stiffness and the constitutive behavior. Our findings reveal that the responses to tension and torsion can be programmed by an appropriate choice of geometrical and material parameters. For example, we show that one can achieve composites with the same stiffness and behavior under uniaxial extension but a wide range of responses to torsion. As a design guide, the wide range of properties and potential strengths that can be obtained in these composites are mapped. To demonstrate the validity of this design, composites embedded with a helical fiber were 3D-printed and tested under tension and torsion. The experimentally observed trends agree with the FE simulations. The design and the insights from this work can be used to enhance and optimize the performance of structures in various applications. For example, this composite design can be used in lattice structures to tune the local response.</span></p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138689830","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

Analytical and isogeometric solutions of flexoelectric microbeams based on a layerwise beam theory 基于分层梁理论的柔电微梁分析和等距解法

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-12-12 DOI: 10.1016/j.mechrescom.2023.104235

Shuohui Yin , Xuefei Wang , Tinh Quoc Bui , Tiantang Yu , Zhihui Zou

引用次数: 0