Mechanics Research Communications最新文献_第8页

On the partial wrinkling of imperfectly guided webs 不完全导向网的局部起皱

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-11-04 DOI: 10.1016/j.mechrescom.2023.104214

Ciprian D. Coman

引用次数: 0

Multi-bounce resonances in the interaction of walking droplets 行走液滴相互作用中的多重弹跳共振

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-11-02 DOI: 10.1016/j.mechrescom.2023.104215

George Zhang , Ivan C. Christov , Aminur Rahman

引用次数: 0

Kinematic behaviour of origami combining two four-crease vertices 包含两个四折痕顶点的折纸的运动学行为

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-31 DOI: 10.1016/j.mechrescom.2023.104213

David Xing, Zhong You

{"title":"Kinematic behaviour of origami combining two four-crease vertices","authors":"David Xing, Zhong You","doi":"10.1016/j.mechrescom.2023.104213","DOIUrl":"10.1016/j.mechrescom.2023.104213","url":null,"abstract":"<div><p>The simplest rigidly foldable single-vertex origami structure is a four-crease origami (single 4C). It is a 1 DOF spherical linkage which possesses geometric properties that allow its copies to be combined into more complex rigidly foldable origami such as the Miura-ori. Merging two identical flat-foldable single 4Cs together produces a new construction, called the double 4C. We discover that this composite structure has some unique kinematic properties. Apart from being rigidly foldable and flat-foldable with 1 DOF, both single 4Cs in the double 4C are always in identical folded states. Moreover, it actually couples some panels together to form scissor-like mechanisms without physically crossing the panels. The double 4C can also have its kinematically equivalent thick-panel counterpart. By dissecting the double 4C and its thick panel counterpart, we find the constituent mechanisms forming them. We uncover how the constituent mechanisms evolve. Since the double 4C are fundamental units in many stackable tessellation origami structures, our kinematic analysis gives insight into the kinematic behaviour of these structures. Not only can the findings be used to guide the creation of thick panel counterparts of the stackable origami, but it may also enable the creation of new origami structures with single DOF by mimicking the vast number of deployable structures that contain scissor-like elements.</p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0093641323001726/pdfft?md5=a41003943a3c8f000e80c827acbd42b6&pid=1-s2.0-S0093641323001726-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136128915","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

Thermo-mechanical experimental investigations of 3D-printed elastomeric polyurethane from low to intermediate strain rates 低至中应变率3d打印弹性体聚氨酯的热力学实验研究

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-30 DOI: 10.1016/j.mechrescom.2023.104212

Jie Yang , Zisheng Liao , Mokarram Hossain , Guanyu Huang , Kai Wang , Xiaohu Yao

{"title":"Thermo-mechanical experimental investigations of 3D-printed elastomeric polyurethane from low to intermediate strain rates","authors":"Jie Yang , Zisheng Liao , Mokarram Hossain , Guanyu Huang , Kai Wang , Xiaohu Yao","doi":"10.1016/j.mechrescom.2023.104212","DOIUrl":"https://doi.org/10.1016/j.mechrescom.2023.104212","url":null,"abstract":"<div><p>Additively manufactured (3D-printed) elastomers have increasing applications in impact resistance devices such as helmets, shoe soles, and shock absorbing architectured metamaterials. These rapidly expanding areas require a proper understanding of the thermo-mechanical behaviours of soft polymers. In this contribution, thermal–mechanical properties of 3D-printed elastomeric polyurethane (EPU) are extensively characterised under low to high strain rates which are missing in the literature. The EPU under investigation is digitally manufactured using a Digital Light Synthesis (DLS) technology and is characterised by tensile experiments with a wide range of strain rates spanning from 0.001/s to 500/s and temperature variations of -20 °C to 60 °C. The experimental results reveal deformation nonlinearity, thermal-sensitivity, and strain rate-sensitivity in the elastomer. Moreover, the study reveals the occurrence of the glass transition phenomenon, which is commonly observed in soft materials under low-temperature and high strain-rate conditions. Various graphical illustrations are presented to depict the effects of temperature and strain rate on the stress response. It is observed that as temperature decreases or strain rate increases, the stress amplifies and becomes more sensitive to variations in temperature or strain rate. Additionally, higher strain levels further enhance the stress sensitivity to these variations. The microscopic mechanisms behind the thermal and strain rate sensitivities are discussed, taking into account the influence of the strain level. Overall, this study contributes to a proper understanding of the thermo-mechanical behaviours of digitally-printed soft polymers, particularly in dynamic scenarios.</p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0093641323001714/pdfft?md5=1f8a866467cbf81ba1bf9acc866f2b5f&pid=1-s2.0-S0093641323001714-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92025100","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

Kresling tube metamaterial exhibits extreme large-displacement buckling behavior Kresling管超材料表现出极端的大位移屈曲行为

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-21 DOI: 10.1016/j.mechrescom.2023.104202

Emilio Turco , Emilio Barchiesi , Andrea Causin , Francesco dell’Isola , Margherita Solci

引用次数: 0

A geometric-based method for the mesh stiffness evaluation of spur gears with spatial cracks 空间裂纹直齿齿轮啮合刚度评估的几何方法

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2023-10-14 DOI: 10.1016/j.mechrescom.2023.104203

Bilal El Yousfi , Abdenour Soualhi , Kamal Medjaher

{"title":"A geometric-based method for the mesh stiffness evaluation of spur gears with spatial cracks","authors":"Bilal El Yousfi , Abdenour Soualhi , Kamal Medjaher","doi":"10.1016/j.mechrescom.2023.104203","DOIUrl":"https://doi.org/10.1016/j.mechrescom.2023.104203","url":null,"abstract":"<div><p><span><span>Bending fatigue is one of the most common failure modes of gear-based transmissions. Bending fatigue often manifests in the form of cracks at the gear tooth root, which propagates over the time, until a part of the tooth or the whole tooth is removed. Many papers have been published to determine the effect of this failure mode on the gear </span>system dynamics<span>, specifically, the gear mesh stiffness. But the majority of them considered uniform </span></span>propagation paths and distribution of the crack profile. Moreover, as we know, the effect of the crack initiation point on the mesh stiffness deformation has not been investigated previously.</p><p>In this study, a geometric-based method is proposed to investigate the effect of non-uniform crack faults on the gear mesh stiffness. This is realized by uncoupling the crack geometry modeling from the stiffness calculation equations, which will enable us to model any crack geometry without any change in the mathematical expressions of the stiffness components. Furthermore, limiting lines of a specific crack shape and initiation point are customized in this study to better consider the effect of random propagated cracks including reascending cracks on the mesh stiffness variation. Simulation results showed that the crack shape, length, and initiation point have a significant effect on the final deformation of the gear mesh stiffness.</p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49867517","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

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