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【新文速递】2024年9月29日固体力学SCI期刊最新文章

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今日更新:International Journal of Solids and Structures 1 篇,Journal of the Mechanics and Physics of Solids 1 篇,Mechanics of Materials 1 篇,Thin-Walled Structures 1 篇

International Journal of Solids and Structures

Does static friction information predict the onset of sliding for soft material?

Huixin Wei, Zhiyong Wang, Xinhao Tu, Xuanshi Cheng, Linan Li, Shibin Wang, Chuanwei Li

doi:10.1016/j.ijsolstr.2024.113087

静摩擦信息能否预测软质材料滑动的开始?

Friction behavior between soft and hard materials has long been a question of great interest in the fields of artificial joints, human skin contact, robotic grippers, and others. In this study, we presented a combination of theoretical and experimental analyses to investigate the friction behavior of soft materials. Using some geometric and stick–slip features in the early stage of static friction, the friction property of the interface between a soft material and a hard material is determined. Moreover, the onset of slip, the threshold force at which a friction interface begins to slide, is also predicted by a theoretical model. The predictive ability of this model may provide insights for improving interaction property recognition, as well as for developing fine tactile feedback and dexterous operation of robotic grasping.

软硬材料之间的摩擦行为长期以来一直是人工关节、人体皮肤接触、机器人抓手等领域非常感兴趣的问题。在这项研究中,我们提出了理论和实验相结合的分析来研究软材料的摩擦行为。利用静摩擦初期的一些几何特征和粘滑特征,确定了软、硬材料界面的摩擦性能。此外,滑移起始力,即摩擦界面开始滑动的阈值,也可以通过理论模型来预测。该模型的预测能力可为改进交互特性识别,以及开发精细触觉反馈和机器人抓取灵巧操作提供见解。


Journal of the Mechanics and Physics of Solids

Hyperelastic constitutive relations for porous materials with initial stress

Mengru Zhang, Weiting Chen, Xianfu Huang, Quanzi Yuan, Ya-Pu Zhao

doi:10.1016/j.jmps.2024.105886

具有初始应力的多孔材料的超弹性本构关系

Initial stress is widely observed in porous materials. However, its constitutive theory remains unknown due to the lack of a framework for modeling the interactions between initial stress and porosity. In this study, we construct the porous hyperelastic constitutive model with arbitrary initial stresses through the multiplicative decomposition approach. Based on the compression experiment of shale samples, the parameters in the constitutive equation are determined. Then, the explicit equations of in-plane elastic coefficients are proposed by linearizing the finite deformation formulation. The influences brought by the coexistence of initial stresses and porosity on these coefficients are revealed. Later, comparative analyses of the linearized equations between the present model, the initially-stressed models without pores, the Biot poroelasticity, and the porous hyperelastic model without initial stress are conducted to illustrate the performances of the two ingredients. As a specific example, we investigate the variation of pore sizes under external pressures and initial stresses since changes in pore sizes during deformation are crucial for understanding the accumulation and migration of shale oil and gas. The newly proposed model provides the first initially stressed porous hyperelasticity (ISPH), which is suitable for describing the finite deformation behavior of solid materials with large porosity and significant initial stress simultaneously.

在多孔材料中广泛观察到初始应力。然而,由于缺乏一个框架来模拟初始应力和孔隙度之间的相互作用,其本构理论仍然未知。本文采用乘法分解方法,建立了具有任意初始应力的多孔超弹性本构模型。通过对页岩试样的压缩实验,确定了本构方程中的参数。然后,将有限变形公式线性化,建立了平面内弹性系数的显式方程。揭示了初始应力和孔隙度共存对这些系数的影响。然后,将该模型与无孔隙初始应力模型、Biot孔隙弹性模型和无初始应力的多孔超弹性模型的线性化方程进行对比分析,以说明两种成分的性能。作为一个具体的例子,我们研究了外部压力和初始应力下孔隙大小的变化,因为变形过程中孔隙大小的变化对于理解页岩油气的聚集和运移至关重要。该模型提供了第一初始应力多孔超弹性模型(ISPH),适用于描述大孔隙率和显著初始应力同时存在的固体材料的有限变形行为。


Mechanics of Materials

Quantification of elastic incompatibilities at triple junctions via physics-based surrogate models

Aaditya Rau, Christopher Schuh, Raúl Radovitzky

doi:10.1016/j.mechmat.2024.105163

通过基于物理的替代模型量化三联点的弹性不相容

Stresses resulting from elastic incompatibilities at grain boundaries have long been known to drive the premature failure and loss of desirable macroscopic properties in polycrystalline materials. In this work, we employ machine learning to create a surrogate model that furnishes a functional relationship between grain boundary configurational data and metrics of incompatibility. A planar triple junction geometry composed of cubic grains rotated about their [001] axis was adopted as the grain boundary model. High-fidelity finite element simulations of this triple junction under hydrostatic extension were used to generate a synthetic dataset for training the surrogate model. A set of J integrals computed around microcracks placed along the triple junction boundaries were used to quantify the elastic incompatibilities between the grains. Using the grain rotation angles and J integrals as the feature and label data respectively, a multi-layer perceptron network was trained using the synthetic data produced with the physics-based model. We demonstrate that the network trained using data from the physics-based model establishes an accurate functional dependence between the triple junction angles and the J integrals that enables direct and fast evaluation. We use the surrogate model to efficiently sweep the configuration space and create contour maps of the largest stress intensification at the triple junction as a function of the grain rotation angles. Furthermore, we show that the analytical properties of the surrogate model can be utilized to identify the most and least compatible triple junction configurations via optimization.

长期以来晶界弹性不相容所产生的应力会导致多晶材料过早失效并丧失理想的宏观特性。在这项工作中,我们利用机器学习创建了一个替代模型,该模型提供了晶界构型数据与不相容性指标之间的函数关系。晶界模型采用了由围绕 [001] 轴旋转的立方晶粒组成的平面三结点几何体。在流体静力学延伸条件下,对该三交界处进行高保真有限元模拟,生成用于训练代用模型的合成数据集。沿三重交界处的微裂缝周围计算的一组 J 积分用于量化晶粒之间的弹性不相容性。将晶粒旋转角度和 J 积分分别作为特征数据和标签数据,使用基于物理模型生成的合成数据训练多层感知器网络。我们证明,使用基于物理模型的数据训练的网络在三重交界角和 J 积分之间建立了精确的函数关系,从而可以进行直接和快速的评估。我们利用代用模型有效地扫描了构型空间,并绘制出了三重交界处最大应力增强与晶粒旋转角函数关系的等高线图。此外,我们还展示了代用模型的分析特性可用于通过优化确定最兼容和最不兼容的三重连接配置。


Thin-Walled Structures

Morphogenesis Analysis of Icosahedral and Prismatic Tensegrity Modules

Xinran Wang, Zhihong Zhang, Hai Liu, Zhenhua Wang, Mingshan Zhang

doi:10.1016/j.tws.2024.112500

二十面体和棱柱张拉整体模的形态发生分析

Morphogenesis is a critical aspect of tensegrity system design. This paper explores icosahedral and prismatic tensegrity modules' pattern formation and foundational theories. First, a material consumption functional and self-strain energy functional is introduced from an engineering perspective, along with a variational principle involving independent dual-variable in the morphogenesis process of tensegrity structures. Next, a Symbol Parsing Method is proposed and successfully applied to the optimal morphology analysis of the icosahedral tensegrity module. Due to memory limitations in personal computers, the Singular Value Decomposition of the symbolic equilibrium matrix for the prismatic tensegrity module is constrained. As an alternative, a discrete numerical solution, the semi-symbolic parsing method, is obtained by directly utilizing a numerical equilibrium matrix. This method was recently employed to analyze and optimize a practical tensegrity footbridge designed by the authors. Lastly, the paper delves into the stability of self-equilibrium states in icosahedral and classical prismatic tensegrity modules by employing a second-order variational analysis of the self-strain energy functional. The findings presented are expected to contribute to future research on the morphogenesis of tensegrity structures.

形态发生是张拉整体系统设计的一个重要方面。本文探讨了二十面体和棱柱张拉整体模的模式形成及其基础理论。首先,从工程角度介绍了材料消耗函数和自应变能函数,以及张拉整体结构形态形成过程中涉及独立双变量的变分原理。其次,提出了一种符号解析方法,并成功应用于二十面体张拉整体模块的最优形态分析。由于个人计算机的内存限制,柱形张拉整体模块的符号平衡矩阵的奇异值分解受到了限制。作为一种替代方法,直接利用数值平衡矩阵得到离散数值解,即半符号解析法。最近将该方法应用于作者设计的实际张拉整体人行桥的分析和优化。最后,通过对自应变能泛函的二阶变分分析,探讨了二十面体和经典棱柱张拉整体模的自平衡态的稳定性。所提出的研究结果有望对张拉整体结构形态发生的未来研究做出贡献。



来源:复合材料力学仿真Composites FEM
ACTSystemDeformGENESISFidelity静力学油气理论材料机器人
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首次发布时间:2024-11-27
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【新文速递】2024年11月22日复合材料SCI期刊最新文章

今日更新:Composite Structures 1 篇,Composites Part A: Applied Science and Manufacturing 1 篇,Composites Part B: Engineering 1 篇,Composites Science and Technology 3 篇Composite StructuresClosed-form analytical solution for local buckling of omega-stringer-stiffened composite panels under compressionCherine El Yaakoubi-Mesbah, Christian Mittelstedtdoi:10.1016/j.compstruct.2024.118716受压下欧米茄筋加筋复合材料板局部屈曲的闭型解析解The use of stiffened thin-walled lightweight structures in e.g. aircraft fuselages requires efficient calculation methods to describe the stability behavior. In this work, a closed-form model for the local buckling analysis of orthotropic composite plates braced by omega-stringers is developed. The problem can be reduced to a plate simply supported at all edges subjected to uniaxial compression with eccentrically attached stringer feet, while the stringer itself is modeled as restraint stiffnesses along the longitudinal edges. The discontinuities in the stiffnesses introduced by the stringer feet result in discontinuities in the curvature behavior and the shear distortion of the structure. In order to map this influence on the local buckling behavior, the reduced model is divided into plate segments of corresponding stiffnesses, for which Ritz-based approach functions for the deformations are defined. Finally, an explicit formulation of the buckling load is derived using the energy method. To validate the model, the Lévy solution is obtained and a finite element analysis is conducted. The results of the parameter studies demonstrate excellent agreement within the design space of the aviation application area.在诸如飞机机身中使用加筋薄壁轻质结构需要有效的计算方法来描述其稳定性行为。本文建立了正交各向异性欧米茄筋支撑复合材料板局部屈曲分析的封闭模型。该问题可以简化为在单轴压缩下所有边缘都有简单支撑的板,并带有偏心附加的弦脚,而弦本身则被建模为沿纵向边缘的约束刚度。弦脚引入的刚度的不连续导致结构的曲率行为和剪切变形的不连续。为了映射这种对局部屈曲行为的影响,将简化模型划分为相应刚度的板段,并定义了基于ritz的变形逼近函数。最后,利用能量法推导出屈曲载荷的显式表达式。为了验证模型的正确性,得到了lsamvy解,并进行了有限元分析。参数研究的结果表明,在航空应用领域的设计空间内,参数研究的结果非常一致。Composites Part A: Applied Science and ManufacturingNonlinear transient analysis of delaminated composite shell panel under hygro-thermo-mechanical load and experimental validationChetan Kumar Hirwani, Naveen Kumar Akkasali, Erukala Kalyan Kumar, Ravi Kumar, Amit Kumar Mehar, Subrata Kumar Pandadoi:10.1016/j.compositesa.2024.108587湿热机械载荷作用下分层复合材料壳板非线性瞬态分析及实验验证In this work, the nonlinear time-dependent deflection responses of delaminated composite shell panel structure under the influence of hygro-thermo-mechanical loading have been investigated numerically. To develop a mathematical model, two different higher-order displacement kinematics, Green-Lagrange’s nonlinear strain–displacement relations and two sub-laminate approaches are adopted for delaminated panel structure in association with finite element steps. The delaminated composite shell panel is under the three simultaneous loading, i.e., humidity, temperature, and mechanical loading. The nonlinear time-dependent responses are obtained by solving the governing equation using the direct iterative method and Newmark’s integration technique. The influence of delamination parameters (size, location, and position), geometry and loading on dynamic characteristics have been analyzed. The differences in responses indicated that the kinematic model with higher degrees of freedom generally shows higher deflection values. Further, a detailed discussion of the numerical illustrations and conclusive remarks based on the findings of the numerical illustrations have been provided.本文对分层复合材料壳板结构在湿热机械载荷作用下的非线性时变挠度响应进行了数值研究。为了建立数学模型,采用格林-拉格朗日非线性应变-位移关系和两种不同的高阶位移运动学方法,结合有限元步骤对分层板结构进行分层。分层复合壳板同时承受湿度、温度和机械三种载荷。采用直接迭代法和Newmark积分法求解控制方程,得到非线性时变响应。分析了分层参数(尺寸、位置和位置)、几何形状和载荷对动态特性的影响。响应的差异表明,自由度越大的运动学模型通常具有较高的挠度值。此外,还提供了数值图解的详细讨论和基于数值图解结果的结论性评论。Composites Part B: EngineeringN/S co-doped nanocomposite of graphene oxide and graphene-like organic molecules as all-carbonaceous anode material for high-performance Li-ion batteriesWooree Jang, Jongmin Kim, Seoyun Lee, Seokhoon Ahn, Hyeyoung Koo, Cheol-Min Yangdoi:10.1016/j.compositesb.2024.111994 N/S共掺杂氧化石墨烯与类石墨烯有机分子纳米复合材料作为高性能锂离子电池的全碳阳极材料In this study, to enhance the electrochemical performance of graphene-based anodes for Li-ion batteries (LIBs), we synthesized an all-carbonaceous N/S co-doped nanocomposite of graphene oxide (GO) and graphene-like small organic molecules (GOM) using a mild, eco-friendly, one-step hydrothermal method with thiourea (CH4N2S) (denoted as h-N/S-GO/GOM). The thiourea facilitated N/S co-doping and π−π bonding, which improved the interaction between hydrophilic GO and hydrophobic GOM in aqueous solution. Notably, the formation of π−π bonds between GO and GOM created pathways that enhanced electron transfer, thereby promoting efficient Li-ion transport from the electrolyte through the channels during rapid charge–discharge cycles. Additionally, the functional groups resulting from N/S co-doping increased the number of active sites within the nanocomposite. Consequently, the h-N/S-GO/GOM anode demonstrated superior electrochemical performance, achieving an average reversible capacity of 1265 mAh g−1 at 0.1 A g−1 and retaining 83.0% of its capacity after 200 cycles. Furthermore, the nanocomposite exhibited excellent long-term cycling stability, maintaining a capacity of 688 mAh g−1 even after 1000 cycles at a high current density of 1.0 A g−1. The hierarchical network structure of the all-carbonaceous h-N/S-GO/GOM anode facilitated efficient charge transfer between the electrode and electrolyte through shorter diffusion paths for Li-ion transport and provided additional active sites, contributing to its outstanding electrical performance. The h-N/S-GO/GOM nanocomposite represents a promising alternative to traditional graphite-based anodes, offering a path toward high-performance, eco-friendly LIBs suitable for applications such as electric vehicles and energy storage systems.在本研究中,为了提高锂离子电池(LIBs)石墨烯基阳极的电化学性能,我们采用温和、环保的一步水热法与硫脲(CH4N2S)合成了氧化石墨烯(GO)和类石墨烯小有机分子(GOM)的全碳共掺杂纳米复合材料(记为h-N/S-GO/GOM)。硫脲促进了N/S共掺杂和π−π成键,改善了水溶液中亲水性GO和疏水性GOM之间的相互作用。值得注意的是,GO和GOM之间π−π键的形成创造了增强电子转移的途径,从而促进了锂离子在快速充放电循环中从电解质通过通道的高效传输。此外,由N/S共掺杂产生的官能团增加了纳米复合材料中活性位点的数量。结果表明,h-N/S-GO/GOM阳极表现出优异的电化学性能,在0.1 A g−1时平均可逆容量达到1265 mAh g−1,并且在200次循环后保持83.0%的容量。此外,该纳米复合材料表现出优异的长期循环稳定性,在1.0 a g−1的高电流密度下,即使在1000次循环后,其容量仍保持在688 mAh g−1。全碳h-N/S-GO/GOM阳极的分层网络结构通过更短的锂离子传输扩散路径,促进了电极和电解质之间有效的电荷转移,并提供了额外的活性位点,有助于其出色的电学性能。h-N/S-GO/GOM纳米复合材料代表了传统石墨基阳极的一个有前途的替代品,为高性能、环保的锂离子电池提供了一条道路,适用于电动汽车和储能系统等应用。Composites Science and TechnologySulfur Co-polymer as a Universal Adhesive to Construct Segregated Structure in Cross-linked Rubber toward Improved Conductive and Mechanical PropertiesShu Wang, Zhenghai Tang, Yilin Xiao, Dong Wang, Baochun Guo, Liqun Zhangdoi:10.1016/j.compscitech.2024.110964 硫共聚物作为一种通用胶粘剂在交联橡胶中构建分离结构以改善导电性能和力学性能Creating segregated structure within composites can significantly improve electrical conductivity but usually compromises mechanical properties. In this contribution, we introduced a straightforward and universal method to fabricate segregated rubber composites with a rare integration of high electrical conductivity and mechanical robustness by utilizing an inverse vulcanized copolymer (SP) as an adhesive to bind the segregated domains. Specifically, sulfur-crosslinked butadiene styrene rubber (SBR) granules were mixed with SP and carbon nanotubes (CNTs), followed by compression molding. CNTs embedded within SP are strategically dispersed along the boundaries of SBR granules, and the reaction of SP with SBR granules creates covalent bonding among the segregated domains and increases their crosslinking density. The segregated skeleton constituted by highly interconnected CNTs is robust, which imparts the composites with high electrical conductivity that is stable upon deformations and is able to heal after damage. In addition, the rigid segregated skeleton preferentially ruptures to dissipate enormous energy, and the cohesive interphase facilitates chain finite extensibility in the highly crosslinked segregated domains, resulting in remarkable enhancements on the tensile strength and modulus of the composites. The universality of this strategy is further demonstrated by using ground waste tyre rubber as matrix and boron nitride sheets as filler.在复合材料中创建分离结构可以显著提高导电性,但通常会损害机械性能。在这篇文章中,我们介绍了一种简单而通用的方法来制造分离橡胶复合材料,通过利用反硫化共聚物(SP)作为粘合剂来结合分离域,该方法具有高导电性和机械稳健性的罕见集成。具体来说,将硫交联丁苯橡胶(SBR)颗粒与SP和碳纳米管(CNTs)混合,然后进行压缩成型。嵌入SP中的CNTs沿着SBR颗粒的边界有策略地分散,SP与SBR颗粒的反应在分离的结构域之间形成共价键,增加了它们的交联密度。由高度互联的CNTs构成的分离骨架是坚固的,这使得复合材料具有高导电性,在变形时稳定,在损伤后能够自愈。此外,刚性偏析骨架优先断裂以耗散大量能量,而内聚界面在高度交联的偏析畴中促进了链的有限扩展,从而显著提高了复合材料的抗拉强度和模量。以磨碎的废轮胎橡胶为基体,氮化硼片为填料,进一步证明了该策略的普遍性。Vertically Aligned Liquid Metal Thermal Pad with Excellent Electromagnetic Shielding and Ultra-High CompressibilityYisimayili Tuersun, Pingjun Luo, Xu Huang, Mingdeng Huang, Yilimiranmu Rouzhahong, Chu Shengdoi:10.1016/j.compscitech.2024.110974 具有优异电磁屏蔽和超高压缩性的垂直排列液态金属热垫With the increasing integration level of modern electronics, flexible highly thermally conductive and electromagnetic interference shielding (EMI) materials were urgently demanded in electronic devices. Traditionally carbon or solid metal fillers are widely used as a reinforcement to fabricate a flexible thermally conductive and EMI shielding materials. However Due to the trade-off between mechanical and thermal properties, it is difficult to further improve the performance of solid filler/polymer composites. Here in this work based on the intrinsic excellent electrical and thermal conductivity of liquid metal (LM), we embedded the LM network structure vertically in the silicone gel and fabricated a vertically aligned LM(VALM) composites. Compared to the randomly dispersed LM composites, VALM composite exhibits high through plane thermal conductivity (κ⊥: 6.08 W/m·K) and excellent EMI shielding efficiency (SE) (minimum and maximum EMI SE for VALM2 were 33.2 dB and 39.5 dB). In addition, due to the fluidic nature of LM, composite materials exhibit excellent softness and flexibility (compression modulus of 0.56 MPa). Practical heat dissipation test results and EMIS efficiencies demonstrate usefulness of VALM composite in next-generation electronics.随着现代电子产品集成化水平的不断提高,柔性高导热和电磁干扰屏蔽材料在电子器件中的应用日益迫切。传统上,碳或固体金属填料被广泛用作增强材料来制造柔性导热和电磁干扰屏蔽材料。然而,由于力学性能和热性能之间的权衡,固体填料/聚合物复合材料的性能很难进一步提高。本文基于液态金属(LM)固有的优异的导电性和导热性,将液态金属网络结构垂直嵌入有机硅凝胶中,制备了垂直排列的液态金属(VALM)复合材料。与随机分散的LM复合材料相比,VALM复合材料具有高透平面导热系数(κ⊥:6.08 W/m·K)和优异的EMI屏蔽效率(SE) (VALM2的最小和最大EMI SE分别为33.2 dB和39.5 dB)。此外,由于LM的流体性质,复合材料表现出优异的柔软性和柔韧性(压缩模量为0.56 MPa)。实际的散热测试结果和EMIS效率证明了VALM复合材料在下一代电子产品中的实用性。3D printing lignin carbonized nanotube and cellulose nano fiber aerogel for wearable pressure sensorsXiaoqing Du, Qi Chen, Qiqi Zhou, Yufan Zhou, Feng Wang, Wangjie Xu, Yulin Zhan, Man Jiangdoi:10.1016/j.compscitech.2024.110976 3D打印木质素碳化纳米管和纤维素纳米纤维气凝胶用于可穿戴压力传感器The nanocellulose represents an important sustainability and chemical stability candidate for conductive 3D aerogel sensors, while introducing additional conductive additives is necessary. Herein, the as developed lignin derived carbonized nanotube (LCNT) in our lab was adopted as conductive ingredient to fabricate cellulose nanofiber (CNF) based composite aerogel by 3D printing. Specifically, the as-prepared LCNT/CNF composite aerogel with ratio of 85:15 in weight presented homogeneous porous morphology with well dispersed and penetrated LCNT in CNF porous matrix, providing a piezoresistive type pressure sensor. Stable signals were achieved under testing range from 0.2 to 9.8 kPa, with response time between 100-200 ms, related to the testing accuracy. The mechanical property of the as-prepared composite aerogel was found to be satisfactory. Under a constant 30% compression strain for 1000 cycles, 92.5% stress retention was maintained, and the ultimate stress was tested to be 16.64 kPa. This work provided a customized wearable pressure sensor with satisfactory comprehensive performance made completely from cellulose and lignin renewable natural polymers.纳米纤维素代表了导电3D气凝胶传感器的重要可持续性和化学稳定性候选材料,同时引入额外的导电添加剂是必要的。本课题以本实验室开发的木质素衍生碳化纳米管(LCNT)为导电材料,采用3D打印技术制备纤维素纳米纤维(CNF)基复合气凝胶。具体而言,制备的重量比为85:15的LCNT/CNF复合气凝胶具有均匀的多孔形态,LCNT在CNF多孔基质中分散和渗透良好,可提供压阻式压力传感器。在0.2 ~ 9.8 kPa的测试范围内获得了稳定的信号,响应时间在100 ~ 200 ms之间,与测试精度有关。所制备的复合气凝胶的力学性能令人满意。在30%恒定压缩应变下,循环1000次,其应力保持率为92.5%,极限应力为16.64 kPa。本工作提供了一种完全由纤维素和木质素可再生天然聚合物制成的具有满意综合性能的定制可穿戴压力传感器。来源:复合材料力学仿真Composites FEM

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