Mechanics Research Communications最新文献_第10页

Dislocation equilibrium in a misfitted composite structure with partially coherent interfaces 部分共融界面错配复合结构中的位错平衡

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104168

Jérôme Colin

引用次数: 1

Lattice modes of periodic origami tessellations with voids 带空洞的周期折纸镶嵌的晶格模式

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104167

Anandaroop Lahiri, Phanisri P. Pratapa

{"title":"Lattice modes of periodic origami tessellations with voids","authors":"Anandaroop Lahiri, Phanisri P. Pratapa","doi":"10.1016/j.mechrescom.2023.104167","DOIUrl":"10.1016/j.mechrescom.2023.104167","url":null,"abstract":"<div><p><span>Elastic modes of origami lattices are of scientific value in the context of metamaterial applications. Miura-ori is a well-studied origami pattern, especially in engineering. A deeper understanding of spatially </span>homogeneous deformations<span> can be useful to homogenization-based material characterization. Miura-ori with rigid parallelogram panels deforms exclusively through crease-folding as a single degree of freedom (DOF) system. Substituting parallelograms with rigid triangular panels introduces two additional DOFs per vertex and could admit a rich space of lattice deformations. In this paper, we investigate the lattice modes of rigid triangulated Miura-ori (RTM) with enclosed voided regions within the tessellations. We use two widely adopted approaches — the bar and hinge framework (BHF) and a folding-angle framework (FAF), that are typically used for the analysis of origami lattices. Unlike the 2D RTM<span> lattice without voids, we find that for the origami lattices with voids, the compatibility constraints based on the crease folding-angles alone are insufficient to capture the admissible deformation modes. Additional loop-closure constraints, based on Denavit–Hartenberg analysis of spatial linkages, must be imposed on creases around each enclosed void. We observe that the homogeneous modes with accumulation of deformations across the lattice are exclusive to the space of Bloch-wave modes within the FAF approach and are not straightforwardly obtained using BHF approach of modeling origami lattices. The 2D RTM lattices with voids, irrespective of the size and aspect ratio of enclosed voids, are found to exhibit exactly six such exclusive FAF modes which can be further characterized using intuitively defined relations between crease angle perturbations.</span></span></p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42845030","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

Self-consistent homogenization approach for polycrystals within second gradient elasticity 二阶梯度弹性下多晶体的自洽均匀化方法

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104162

Yury Solyaev

{"title":"Self-consistent homogenization approach for polycrystals within second gradient elasticity","authors":"Yury Solyaev","doi":"10.1016/j.mechrescom.2023.104162","DOIUrl":"10.1016/j.mechrescom.2023.104162","url":null,"abstract":"<div><p><span><span>In this paper, we propose a generalized variant of Kröner’s self-consistent scheme for evaluation of the effective standard and gradient elastic moduli<span> of polycrystalline materials within Mindlin-Toupin second-gradient </span></span>elasticity theory<span>. Assuming random orientation of crystallites<span> (grains) we use an extended Eshelby’s equivalent inclusion method and mapping conditions between the prescribed linear distribution of macro-strain and corresponding micro-scale field variables averaged over the volume and all possible orientations of single grain. It is found that the developed self-consistent scheme predicts an absence of gradient effects at the macro-scale level for the model of ellipsoidal grains made of the first gradient (Cauchy-type) material. However, for the case of the second gradient crystallites, established approach allows to obtain a set of non-linear relations for determination of all effective standard and gradient elastic moduli of </span></span></span>polycrystals<span>. Example of calculations under simplified constitutive assumptions is presented for the model of anisotropic<span> cubic Fe crystallites with spherical shape. It is shown that the presented approach predicts an increase of the effective length scale parameter of polycrystalline aggregates due to misorientation of grains axes and takes into account the size effects related to the mean diameter of grains.</span></span></p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46616855","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

Self-consistent approximations for the tangential-displacement correction to the incremental indentation stiffness 增量压痕刚度切向位移修正的自洽近似

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104186

Ivan Argatov , Xiaoqing Jin

引用次数: 0

Generalizing rigid-foldable tubular structures of T-hedral type 广义t面体型刚性可折叠管状结构

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104151

K. Sharifmoghaddam , R. Maleczek , G. Nawratil

引用次数: 2

On the coupled linear theory of thermoelasticity for nanomaterials which triple porosity 三倍孔隙率纳米材料热弹性耦合线性理论

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104161

Merab Svanadze

引用次数: 1

Shape optimization of non-rigid origami leading to emerging bistability 非刚性折纸的形状优化导致出现双稳态

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104165

Yibo Wang, Ke Liu

{"title":"Shape optimization of non-rigid origami leading to emerging bistability","authors":"Yibo Wang, Ke Liu","doi":"10.1016/j.mechrescom.2023.104165","DOIUrl":"10.1016/j.mechrescom.2023.104165","url":null,"abstract":"<div><p><span><span>Origami structures are a type of thin-walled flexible structures that undergo large deformation<span>. Their inherent non-rigid characteristic empowers them with great potential for applications in space structures, metamaterials, and robotics. To understand the large deformation of origami structures, consideration of nonlinear mechanics is necessary. However, most origami structures are still designed by pure geometric approaches without considering their non-rigid behavior. In this work, we propose a computational design framework that incorporates nonlinear mechanics into the design procedure of origami. Guided by minimization of stored energy, under </span></span>prescribed displacement boundary conditions, we optimize the configuration of origami structures. Difficulties arise due to the complex energy landscape of origami structures that inevitably induces bifurcation. We develop strategies to keep track of a stable deformation branch during the optimization process. A surprising outcome is that our approach naturally leads to self-emerging </span>bistable structures, which is demonstrated by a series of numerical examples. We believe that our new approach would make substantial contribution to computational design of non-rigid origami structures, benefiting applications in origami-inspired solutions for science and engineering.</p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47603909","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

A review of theories to calculate pore pressures when fluids penetrate into rocks 流体进入岩石时孔隙压力计算理论综述

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104184

Catarina Baptista-Pereira, Bruno Gonçalves da Silva , Jay N. Meegoda

引用次数: 0

PREFACE: Brian Straughan 75th birthday celebratory issue 前言:布莱恩·斯特劳恩75岁生日庆祝特刊

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104176

Anthony D. Rosato

引用次数: 0

Rigidity analysis and mechanical properties of programmable origami tubes 可编程折纸管的刚度分析及力学性能

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104182

Huizhong Zhang , Qian Zhang , Xiao Liang , Kuan Yao , Ahmad BH Kueh , Jianguo Cai

{"title":"Rigidity analysis and mechanical properties of programmable origami tubes","authors":"Huizhong Zhang , Qian Zhang , Xiao Liang , Kuan Yao , Ahmad BH Kueh , Jianguo Cai","doi":"10.1016/j.mechrescom.2023.104182","DOIUrl":"10.1016/j.mechrescom.2023.104182","url":null,"abstract":"<div><p>The article presents the rigidity analysis and mechanical properties evaluation of ‘Flip-Flop’ typed interleaved origami tubes. This origami configuration is composed of two tubes arranged in an orthogonal manner. The rigidity of the basic unit is judged by using the loop-closure equation and dual quaternion methods while the corresponding compression performance is studied with the numerical simulation. A parametric analysis is performed to assess the effects of geometrical parameters on their compression performance. The parameters are thickness-to-length ratio (t/l) and angles (α, β) of the basic unit. The parametric analysis outcomes reveal that the interleaved origami tube has good programmability. Generally, when |α-β| is larger, the compression energy absorption characteristics in the X/Y-direction of the basic unit are greatly improved, while the decrease of angles α and β is conducive to improving the structural bearing capacity and compression energy absorption characteristics in the Z-direction. Fixing α while changing β has a greater effect on reducing the normalized mean stress ratio although, for a fixed β, a variation in α has no obvious contribution. Thus, highlighting the importance of the variation of β in influencing the compressive performance of the interleaved origami tubes as reference for future research.</p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48257108","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