Mechanics Research Communications最新文献_第9页

Bandgap widening and resonator mass reduction through wave locking 通过锁波扩大带隙和减少谐振器质量

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-12 DOI: 10.1016/j.mechrescom.2023.104200

L. Iorio, J.M. De Ponti, A. Corigliano, R. Ardito

引用次数: 0

Influence of manufacturing factors on compressive behavior of soft architected composite with a 3D-printed cellular core 制造因素对3d打印蜂窝芯软结构复合材料压缩性能的影响

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-12 DOI: 10.1016/j.mechrescom.2023.104201

Zhixiong Li , Pan Liu , Baixi Chen , Tongtong Ye , Yuan-Fang Zhang , Nan Hu

{"title":"Influence of manufacturing factors on compressive behavior of soft architected composite with a 3D-printed cellular core","authors":"Zhixiong Li , Pan Liu , Baixi Chen , Tongtong Ye , Yuan-Fang Zhang , Nan Hu","doi":"10.1016/j.mechrescom.2023.104201","DOIUrl":"https://doi.org/10.1016/j.mechrescom.2023.104201","url":null,"abstract":"<div><p>Soft material is widely used for energy dissipation<span><span> in a diverse range of applications from shoe soles to bridge bearings. Recent advances in </span>additive manufacturing<span><span> enable more new classes of materials such as soft architected composites (SAC) with 3D-printed cores that are embedded into a soft matrix. SAC has demonstrated excellent load-carrying capacity, ductility, and energy absorption under compression compared to soft material alone, but the influence of key manufacturing factors remains unknown. In this work, we conducted experimental investigations on SAC specimens considering various manufacturing parameters, including the printing materials, volume fraction, filling pattern, and printing parameters. Notably, the SAC with the gyroid filling pattern demonstrates superior specific stiffness and </span>specific energy absorption. The effect of the printing parameters on the SAC was non-linear, and the optimal values were influenced by the core geometries. The SAC unit filled with gyroid pattern and manufactured using optimized printing parameters exhibited significant improvement in specific stiffness and specific energy absorption over those with the same mass of reinforcing phase. These results can guide the further design of similar architected composite by considering the appropriate selection of manufacturing parameters and geometric designs. With the improved mechanical properties, the concept of SAC can be further used in developing lightweight and high-performing energy absorption and dissipation components and devices.</span></span></p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49867516","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

Surface effects and symmetry lowering effect on the anisotropic bending and equilibrium of freestanding nanofilms 表面效应和对称性降低对独立纳米膜各向异性弯曲和平衡的影响

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-11 DOI: 10.1016/j.mechrescom.2023.104199

Jiangang Li , Yuning Du , Huihui Xu , Zhixiang Gao , Hua Wang

{"title":"Surface effects and symmetry lowering effect on the anisotropic bending and equilibrium of freestanding nanofilms","authors":"Jiangang Li , Yuning Du , Huihui Xu , Zhixiang Gao , Hua Wang","doi":"10.1016/j.mechrescom.2023.104199","DOIUrl":"https://doi.org/10.1016/j.mechrescom.2023.104199","url":null,"abstract":"<div><p>A self-consistent theory for describing self bending, self equilibrium and symmetry lowering of nanofilms was proposed in this paper. The lowered symmetry and corresponding additional elastic parameter were considered to describe the mechanical properties of nanofilms. A freestanding nanofilm may spontaneously roll into a nanotube<span> due to intrinsic surface stress imbalance. It is not necessarily isotropic for surface stress. The anisotropic surface stress is possible, Si nanofilm with (001) surface may behave (2 × 1) reconstruction, for example. The anisotropic surface stress induces anisotropic bending. And then, the isotropic Stoney formular should be modified to suit the anisotropic surface stress effect. A theory for anisotropic bending should be established. On the other hand, intrinsic surface stress balance induces uniform in-plane deformation of nanofilms. The theory in this paper was used to predict equilibrium strains of Cu, Ni, Ag, Au, Pd and Pt nanofilms, and was used to research Si nanofilm rolling behavior.</span></p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49871327","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

Large amplitude forced vibrations of multi-stepped beams carrying concentric masses 承载同心质量的多阶梁的大振幅强迫振动

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104163

I.El Hantati , A. Adri , Y.El Khouddar , H. Fakhreddine , O. Outassafte , R. Benamar

引用次数: 0

Centrifugal and gyroscopic effects on dynamic response of rotating cantilever beams under step loading 离心和陀螺效应对阶梯加载下旋转悬臂梁动力响应的影响

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104185

Hedi Hamdi , Adel Hamdi , Rachid Nasri

{"title":"Centrifugal and gyroscopic effects on dynamic response of rotating cantilever beams under step loading","authors":"Hedi Hamdi , Adel Hamdi , Rachid Nasri","doi":"10.1016/j.mechrescom.2023.104185","DOIUrl":"10.1016/j.mechrescom.2023.104185","url":null,"abstract":"<div><p>In this paper, a simplex finite element model for beams (FEMB) with a complete formulation is presented to study the dynamics of rotating cantilever beams subjected to distributed external loads. In our approach, the finite element method (FEM) and Timoshenko's beam theory is used. We will, particularly, examine the centrifugal and gyroscopic effects on the linear vibration of a rotating cantilever beam in stationary regime. In this model, extension, bending, and torsion degrees of freedom (DOF) are combined using a parameterization of the 3D motion of the beam by Euler's three-angle sequence. That allows identifying all the terms of the gyroscopic coupling in a more compact equations system. To ensure convergence, a sufficient number of finite elements are required in this model. The considered beam in the numerical simulation is pre-twisted and linearly tapered with a rectangular section. Results show that the dynamic centrifugal effect decreases the natural frequencies of the beam. Furthermore, the gyroscopic coupling induces rapid extension and torsion beatings when the beam undergoes a step bending load. Without damping, these beatings can persist and cause material fatigue.</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":"48503897","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 variegated effective elastic modulus in metabeams under periodically distributed loads 周期性分布荷载作用下元梁的变化有效弹性模量

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104166

Eduard G. Karpov, Debajyoti Saha

{"title":"A variegated effective elastic modulus in metabeams under periodically distributed loads","authors":"Eduard G. Karpov, Debajyoti Saha","doi":"10.1016/j.mechrescom.2023.104166","DOIUrl":"https://doi.org/10.1016/j.mechrescom.2023.104166","url":null,"abstract":"<div><p>A class of beam-like lattice structures, or metabeams under static, sinusoidally distributed transverse loads is discussed. Their neutral axis deflects either in-phase, out-of-phase or shows no deflection, depending on the beam design parameters, and also on the <span><em>spatial frequency</em></span> of the static load. These outcomes contrast the behavior of continuum beams, deflecting always in-phase with the load, and they are interpreted on the basis of a positive, negative and near-infinite <em>effective</em><span> Young's modulus of the structured beams in bending. They also represent a </span><em>collective effect</em><span> of the behavior of multiple elements in the lattice that cannot be realized from the performance of an isolated unit cell. A long-range periodic order and nonlocality of the lattice interaction is essential for this unusual behaviors, and those are particularly pronounced at higher wavenumbers, when the load wavelength becomes comparable with the range of direct interactions in the lattice. Theoretical discussion and predictions agree well with numerical experiments performed on the basis of commonly accepted models. Practical applications could be found in advanced reinforcing materials for building foundations, deformation mitigation for lightweight structures and bridges, and in smart mechanical systems able to differentiate external stimuli and to respond selectively.</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":"49864709","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

Rare rogue fluctuations could be generic to strongly nonlinear and non-integrable systems 罕见的流氓波动可能是强非线性和不可积系统的普遍现象

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104179

Rahul Kashyap , Surajit Sen

引用次数: 0

Effects of Kerr-type viscoelastic coupling layer with different stiffnesses on stochastic stability of Rayleigh double beams 不同刚度kerr型粘弹性耦合层对瑞利双梁随机稳定性的影响

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104181

Dunja Milić , Jian Deng , Vladimir Stojanović , Marko D. Petković

{"title":"Effects of Kerr-type viscoelastic coupling layer with different stiffnesses on stochastic stability of Rayleigh double beams","authors":"Dunja Milić , Jian Deng , Vladimir Stojanović , Marko D. Petković","doi":"10.1016/j.mechrescom.2023.104181","DOIUrl":"10.1016/j.mechrescom.2023.104181","url":null,"abstract":"<div><p>This paper discusses the stochastic stability of a double Rayleigh beam system connected by a Kerr-type three-parameter elastic layer with two different stiffnesses, under compressive axial loads<span><span><span>. The beams are modeled using the Rayleigh beam theory, and the axial forces consist of a constant component and a time-dependent stochastic function. The study investigates the almost-sure and moment stability of the double beam system subjected to stochastic compressive </span>axial loading<span>, utilizing the Lyapunov exponent and moment Lyapunov exponents. In the case of weak noise excitations, a singular perturbation method is employed to derive second-order expansions of the moment Lyapunov exponent and the Lyapunov exponent. Monte Carlo simulation is included to validate the obtained results. A numerical study is conducted for selected parameters, and the almost-sure and moment stability in the first and second perturbation are graphically presented. The results provide insights into the influences of different stiffnesses, damping, and the shear parameter of the Kerr-type layer on the stochastic stability of the coupled Rayleigh beam </span></span>mechanical system<span>, considering the effects of rotational inertia. It is quantitatively and qualitatively determined that reducing the stiffness of one part of the Kerr-type layer leads to a decrease in the stable region of stochastic stability, while reducing the shear parameter results in an increase in the stable region of stochastic stability. Furthermore, a quantitative relationship between different dampings of the Kerr-type viscoelastic layer is determined, where increasing either of the two damping parameters leads to an expansion of the stable region of stochastic stability. The inclusion of rotational inertia effects through the Rayleigh beam theory contributes to more accurate approximations of the obtained solutions.</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":"41427373","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

Influence of nozzle design on flow, mixing, and fluidisation in a bubbling bed fluidised by a single nozzle 喷嘴设计对单喷嘴流化床中流动、混合和流化的影响

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104180

D. Werner , C.R.K. Windows-Yule , Tz. Kokalova-Wheldon , J.P.K. Seville

引用次数: 0

Continuous softening up to the onset of failure: A hyperelastic modelling approach with intrinsic softening for isotropic incompressible soft solids 连续软化直至失效：各向同性不可压缩软固体的超弹性建模方法

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-01 DOI: 10.1016/j.mechrescom.2023.104183

Afshin Anssari-Benam

{"title":"Continuous softening up to the onset of failure: A hyperelastic modelling approach with intrinsic softening for isotropic incompressible soft solids","authors":"Afshin Anssari-Benam","doi":"10.1016/j.mechrescom.2023.104183","DOIUrl":"10.1016/j.mechrescom.2023.104183","url":null,"abstract":"<div><p>This paper seeks to put forward an alternative notion for modelling the <em>continuous</em> softening in the finite deformation of incompressible isotropic rubber-like materials, up to the onset of failure. Based on the proposition that ‘there is no fundamental reason as to why the basic constitutive parameters of the (hyper)elastic state of a material cannot determine the natural evolution of softening and failure in that material’, the concept of <em>hyperelasticity with intrinsic softening</em> is posited. In contrast to the currently available theories of continuum damage mechanics and energy limiters, which superpose external parameters onto the basic hyperelastic model, the alternative approach presented here postulates that if a hyperelastic strain energy function accommodates a <em>comprehensive</em> set of constitutive parameters and has an appropriate functional form, it will intrinsically capture the observed continuous softening in the stress–deformation curves of soft solids, up to the onset of failure. Examples of this notion are presented using a specific hyperelastic model previously proposed by the author, applied here to extant datasets of a wide variety of isotropic incompressible soft solids, ranging from soft tissues to protein gels and 3D printed biomaterials, that include the softening behaviour. The favourable modelling results obtained via this approach are demonstrated. It is conferred that these results portend a versatile modelling tool for application to the whole-range deformation of soft solids, up to the onset of failure, and make the case for devising a unified theory for modelling both continuous and discontinuous softening in the finite deformation of rubber-like materials.</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":"43680004","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: 1