Extreme Mechanics Letters最新文献_第6页

Frustrated domes: From planar metamaterials to load-bearing structures 受挫圆顶：从平面超材料到承重结构

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-05-24 DOI: 10.1016/j.eml.2025.102352

Imtiar Niloy , Lucas Annink , Olivine Silier , Chiara Daraio , Paolo Celli

引用次数: 0

Hexagonal tessellation-based mechanical metamaterials 基于六边形镶嵌的机械超材料

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-05-21 DOI: 10.1016/j.eml.2025.102356

Reza Moghimimonfared, Andrea Spaggiari, Luigi Grasselli, Luke Mizzi

{"title":"Hexagonal tessellation-based mechanical metamaterials","authors":"Reza Moghimimonfared, Andrea Spaggiari, Luigi Grasselli, Luke Mizzi","doi":"10.1016/j.eml.2025.102356","DOIUrl":"10.1016/j.eml.2025.102356","url":null,"abstract":"<div><div>Mechanical metamaterials based on Euclidean polygonal tessellations represent a new class of architectured materials with the potential to exhibit a wide range of mechanical properties. In this work, we investigate a new class of systems based on the generic hexagonal tessellation with trigonal rotational symmetry and show how this tessellation has the potential to exhibit a wide range of Poisson’s ratios, including auxeticity, as well as a large spectrum of Young’s moduli whilst retaining transverse isotropy. The tessellation was characterized through geometric expressions in order to identify which combination of geometric parameters lead to realizable, concave or convex configurations and Finite Element simulations were used to evaluate the mechanical properties of these tessellations. Furthermore, three additively-manufactured prototypes, representative of the entire Poisson’s ratio range (i.e. negative, zero and positive Poisson’s ratio) were experimentally tested and analysed using Digital Image Correlation. The results obtained from both simulation and experimental approaches demonstrate the mechanical capabilities of these tessellations and indicate how new auxetic metamaterials may be found by exploring the vast design space afforded by Euclidean polygonal tilings.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"77 ","pages":"Article 102356"},"PeriodicalIF":4.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144137877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Molecular Velcro for characterizing hydrogel coating adhesion 表征水凝胶涂层附着力的分子魔术贴

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-05-19 DOI: 10.1016/j.eml.2025.102357

Yuan Wang , Hui Yuan , Zhikun Miao , Junjie Liu , Xuxu Yang , Yecheng Wang

{"title":"Molecular Velcro for characterizing hydrogel coating adhesion","authors":"Yuan Wang , Hui Yuan , Zhikun Miao , Junjie Liu , Xuxu Yang , Yecheng Wang","doi":"10.1016/j.eml.2025.102357","DOIUrl":"10.1016/j.eml.2025.102357","url":null,"abstract":"<div><div>Rapid advances in hydrogel adhesion have enabled the development of hydrogel coating on various substrates for lubrication, drug delivery, and anti-fouling paints. The quality of adhesion between hydrogel coating and substrate is important in applications, but has been shown to be extremely challenging to assess. Here we develop a general approach to characterizing the adhesion of hydrogel coating, called the molecular Velcro. Such Velcro is a stiff layer, to which polymer chains are grafted through covalent interlinks, and adheres to hydrogel through non-covalent interlinks. We prepare a 35 μm-thick hydrogel coated on a rigid substrate, introduce a pre-cut crack to their interface, and use the molecular Velcro as backing layer to measure the adhesion toughness by 90-degree peel. As the non-covalent adhesion between the molecular Velcro and the hydrogel is instant and tough, and does not affect the mechanical properties of the hydrogel, the crack grows along the interface between the hydrogel and the substrate, or kinks into the hydrogel. Consequently, the adhesion between the hydrogel coating and the substrate is precisely characterized at various coating thicknesses, peel velocities, and crosslink densities. To show the robustness of our approach, we further measure the adhesion toughness of several types of 50 μm-thick hydrogels coated on the same substrate. This work will guide the characterization of adhesion of soft and wet coatings.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"77 ","pages":"Article 102357"},"PeriodicalIF":4.3,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Implicit geometric descriptor-enabled ANN Framework for a unified structure-property relationship in architected nanofibrous materials 基于隐式几何描述符的人工神经网络框架用于构建纳米纤维材料的统一结构-性能关系

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-05-17 DOI: 10.1016/j.eml.2025.102346

Bhanugoban Maheswaran, Komal Chawla, Abhishek Gupta, Ramathasan Thevamaran

{"title":"Implicit geometric descriptor-enabled ANN Framework for a unified structure-property relationship in architected nanofibrous materials","authors":"Bhanugoban Maheswaran, Komal Chawla, Abhishek Gupta, Ramathasan Thevamaran","doi":"10.1016/j.eml.2025.102346","DOIUrl":"10.1016/j.eml.2025.102346","url":null,"abstract":"<div><div>Hierarchically architected nanofibrous materials, such as the vertically aligned carbon nanotube (VACNT) foams, draw their exceptional mechanical properties from the interplay of nanoscale size effects and inter-nanotube interactions within and across architectures. However, the distinct effects of these mechanisms, amplified by the architecture, on different mechanical properties remain elusive, limiting their independent tunability for targeted property combinations. Reliance on architecture-specific explicit design parameters further inhibits the development of a unified structure–property relationship rooted in those nanoscale mechanisms. Here, we introduce two implicit geometric descriptors — multi-component shape invariants (MCSI) — in an artificial neural network (ANN) framework to establish a unified structure–property relationship that governs diverse architectures. The MCSIs effectively capture the key nanoscale mechanisms that give rise to the bulk mechanical properties such as specific-energy absorption, peak stress, and average modulus. Exploiting their ability to predict mechanical properties for designs that are even outside of the training data, we propose generalized design strategies to achieve desired mechanical property combinations in architected VACNT foams. Such implicit descriptor-enabled ANN frameworks can guide the accelerated and tractable design of complex hierarchical materials for applications ranging from shock-absorbing layers in extreme environments to functional components in soft robotics.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"77 ","pages":"Article 102346"},"PeriodicalIF":4.3,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Cylindrical cavity expansion for characterizing mechanical properties of soft materials 表征软质材料力学性能的圆柱腔膨胀

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-05-14 DOI: 10.1016/j.eml.2025.102343

Jian Li , Zihao Xie , Hannah Varner , S. Chockalingam , Tal Cohen

{"title":"Cylindrical cavity expansion for characterizing mechanical properties of soft materials","authors":"Jian Li , Zihao Xie , Hannah Varner , S. Chockalingam , Tal Cohen","doi":"10.1016/j.eml.2025.102343","DOIUrl":"10.1016/j.eml.2025.102343","url":null,"abstract":"<div><div>The low elastic modulus of soft materials, combined with geometric nonlinearity and rate dependence, presents significant challenges in the characterization of their mechanical response. We introduce a novel method for measuring the mechanical properties of soft materials under large deformations via cylindrical cavity expansion. In this method, a cylindrical cavity is fabricated in the material and expanded by volume-controlled injection of an incompressible fluid with simultaneous measurement of the applied pressure at the cavity wall. The relationship between applied pressure and deformation at the cavity wall is then employed to characterize the nonlinear mechanical properties. This method improves traditional volume-controlled cavity expansion testing and other needle-induced cavity expansion methods by precisely controlling the geometry and size of the initial defect or cavity, significantly enhancing both the accuracy and repeatability of the experimental results. We demonstrate the feasibility of the proposed method and validate it by measuring the mechanical properties of synthetic polydimethylsiloxane (PDMS) and comparing with reported values in the literature. Results indicate that the cylindrical cavity expansion method effectively captures the response of PDMS over a wide range of stiffness (shear modulus ranging from 5 kPa to 300 kPa) and exhibit high repeatability. The proposed method overcomes limitations in characterization of ultra-soft materials using traditional testing methods, such as challenges with fabrication and clamping in uniaxial tension testing and friction and adhesion effects in compression and indentation testing, thus enabling accurate and precise characterization.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"77 ","pages":"Article 102343"},"PeriodicalIF":4.3,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Mode-coupled infinite topological edge state in bulk-lattice-merged mechanical Su–Schrieffer–Heeger chain 块格融合机械Su-Schrieffer-Heeger链中模式耦合无限拓扑边态

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-05-12 DOI: 10.1016/j.eml.2025.102334

Yeongtae Jang , Seokwoo Kim , Minkyung Kim , Guenil Kim , Eunho Kim , Junsuk Rho

{"title":"Mode-coupled infinite topological edge state in bulk-lattice-merged mechanical Su–Schrieffer–Heeger chain","authors":"Yeongtae Jang , Seokwoo Kim , Minkyung Kim , Guenil Kim , Eunho Kim , Junsuk Rho","doi":"10.1016/j.eml.2025.102334","DOIUrl":"10.1016/j.eml.2025.102334","url":null,"abstract":"<div><div>Band topology has emerged as a powerful tool for designing mechanical engineering systems, from phononic crystals to metamaterials. Various design principles — whether bulk-based or lattice-based — have been proposed and successfully implemented according to unit cell structures. Here, we present a bulk-lattice merged Su–Schrieffer–Heeger (SSH) chain constructed from single-column woodpile metamaterials. This system consists of a lattice array of cylindrical particles, where each particle’s bulk dynamics exhibits local resonance-mode coupling with wave propagation. We demonstrate that topological edge states emerge in direct correspondence with these local resonance modes, manifesting as mode-coupled topological states. Experimentally, we observe the initial emergence of these mode-coupled topological edge states, with their frequencies accurately predicted by nonlinear characteristic equations rooted in continuum dynamics and topological symmetry. Additionally, the system’s weak nonlinearity enables simultaneous frequency shifts, allowing multivariate tunability in its topological states.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"77 ","pages":"Article 102334"},"PeriodicalIF":4.3,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144106868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

An extended Euler-Bernoulli beam principle in multi-component metamaterial towards tunable Poisson’s ratio 面向泊松比可调的多组分超材料中欧拉-伯努利光束原理的扩展

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-05-10 DOI: 10.1016/j.eml.2025.102347

Jingyi Zhang , Yuheng Liu , Haibao Lu , Ran Tao

{"title":"An extended Euler-Bernoulli beam principle in multi-component metamaterial towards tunable Poisson’s ratio","authors":"Jingyi Zhang , Yuheng Liu , Haibao Lu , Ran Tao","doi":"10.1016/j.eml.2025.102347","DOIUrl":"10.1016/j.eml.2025.102347","url":null,"abstract":"<div><div>In this paper, a multi-component mechanical metamaterial was proposed to achieve tunable nominal modulus and Poisson’s ratio to extend the potential and practical applications in smart materials and structures. Based on the Euler-Bernoulli beam theory, a universal model was formulated for the multi-component metamaterial to explore the constitutive relationship between the model parameters and mechanical properties. The theoretical model reveals that the Poisson’s ratio of the multi-component metamaterial could be quantitatively regulated over a broad range by manipulating the moduli of its constituent components. On this basis, a bi-component metamaterial composed of polylactic acid (PLA) and thermoplastic polyurethane (TPU), featuring distinct temperature-dependent moduli and geometric configurations, was manufactured and exhibited thermally tunable mechanical behavior. Parametric finite element simulations were conducted to investigate the synergistic effect of temperature-dependent moduli and geometric parameters on the stable mechanical behaviors of the bi-component metamaterial, with the results validated by experimental measurements. This study examines the design principle that combines material parameters (temperature-dependent moduli) and structural parameters (geometric parameters) for the multi-component mechanical metamaterial. The methodologies and insights presented in this paper provide new perspectives and technical approaches for the innovative applications of metamaterials in aerospace, biomedical, and microelectronic fields.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"77 ","pages":"Article 102347"},"PeriodicalIF":4.3,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Kinematic folding propagation in degree-4 origami strips 4度折纸条的运动折叠传播

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-05-09 DOI: 10.1016/j.eml.2025.102337

Rinki Imada , Akito Adachi , Shingo Terashima , Eiji Iwase , Tomohiro Tachi

{"title":"Kinematic folding propagation in degree-4 origami strips","authors":"Rinki Imada , Akito Adachi , Shingo Terashima , Eiji Iwase , Tomohiro Tachi","doi":"10.1016/j.eml.2025.102337","DOIUrl":"10.1016/j.eml.2025.102337","url":null,"abstract":"<div><div>Degree-4 origami strips, one-DOF mechanisms constructed by sequentially connecting degree-4 origami vertices, have inspired origami-based engineering design. However, thorough kinematic analyses were limited to a special subset of degree-4 origami strips that exhibit uniform folding along the sequence. In this study, we show how folding propagates non uniformly, i.e., gets attenuated or amplified, in a general degree-4 origami strip. We introduce the concept of kinematic folding propagation and analyze it by studying discrete dynamical systems. Our results reveal that, despite its simple structure, the strip exhibits diverse folding propagation behaviors, strongly influenced by design parameters such as sector angles and topology of the crease patterns. We show that the propagation behavior is topologically linear when adjacent vertices are connected via opposite creases. We compute and visualize folding motions, including strips that transition from a flat-folded state to a helical shape through uniform or nonuniform (attenuated/amplified) propagation upon actuation of the boundary crease. Additionally, we demonstrate folding propagation in physical models using 3D-printed prototypes with thick panels. Furthermore, we show that topologically nonlinear propagation emerges when adjacent creases are used to connect adjacent vertices. We also discuss folding propagation in curved-crease origami that is achieved by taking a continuum limit of the strip. Our findings establish kinematic folding propagation as a core functionality enabled by nonuniform folding, thereby laying the foundation for programmable origami.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"77 ","pages":"Article 102337"},"PeriodicalIF":4.3,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Geometric dependence of curvature-induced rigidity

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-05-09 DOI: 10.1016/j.eml.2025.102341

Hanzhang Mao , Thomas G.J. Chandler , Mark Han , Saverio E. Spagnolie

{"title":"Geometric dependence of curvature-induced rigidity","authors":"Hanzhang Mao , Thomas G.J. Chandler , Mark Han , Saverio E. Spagnolie","doi":"10.1016/j.eml.2025.102341","DOIUrl":"10.1016/j.eml.2025.102341","url":null,"abstract":"<div><div>Bending the edge of a thin elastic material promotes rigidity far from its clamped boundary. However, this curvature-induced rigidity can be overwhelmed by gravity or other external loading, resulting in elastic buckling and large deformations. We consider the role of body geometry on this competition using experiments, numerical simulations, and reduced-order models. Finite element simulations are performed using a model nonlinear hyperelastic material, and a theoretical framework is proposed that incorporates small lateral curvatures, large longitudinal rotations, and a varying cross-sectional width. A particular focus is on the comparison between rectangular and triangular sheets, and trapezoidal sheets in between. Sheet geometry affects downward tip deflection by changing the relative importance of the sheet’s weight and the rigidity provided by curvature, often in subtle ways. In extreme cases, non-monotonic deflection is observed with increasing sheet length, and a region of hysteretic bistability emerges, becoming more pronounced with rectangular sheets and large imposed curvatures. These findings demonstrate the profound impact of geometry on the competition between curvature-induced rigidity and gravity-induced deformation in thin elastic materials.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"77 ","pages":"Article 102341"},"PeriodicalIF":4.3,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143943646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Force-biased chemical degradation in rubbery networks: Insights from discrete network simulations 橡胶网络中的力偏化学降解：来自离散网络模拟的见解

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-05-08 DOI: 10.1016/j.eml.2025.102344

Lucas Mangas Araujo, Laurence Brassart

{"title":"Force-biased chemical degradation in rubbery networks: Insights from discrete network simulations","authors":"Lucas Mangas Araujo, Laurence Brassart","doi":"10.1016/j.eml.2025.102344","DOIUrl":"10.1016/j.eml.2025.102344","url":null,"abstract":"<div><div>This study investigates the effect of force-assisted chemical reaction leading to chain scission on the mechanical and swelling behaviour of rubbery networks. A Discrete Network (DN) modelling approach is adopted, in which polymer chains are represented as entropic springs connected at crosslink points. Force-accelerated chain scission is simulated using a Kinetic Monte Carlo algorithm. The model further accounts for degradation-induced swelling due to solvent uptake and mass loss due to the release of chain clusters detached from the main network. Discrete Network simulations highlight the role of force heterogeneities on the degradation of mechanical properties. Chains bearing the largest forces are cut preferentially, which accelerates the reduction in modulus and loss of percolation. When degradation occurs under constraint, force-biased degradation leads to anisotropic residual elastic properties. These effects cannot be captured by a state-of-the-art micromechanics-based continuum model, which does not account for the redistribution of forces through the network. Overall, the discrete network framework provides a promising platform to study a broader range of mechano-chemical phenomena in elastomers and gels.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"77 ","pages":"Article 102344"},"PeriodicalIF":4.3,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143931890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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