【新文速递】2025年9月23日固体力学SCI期刊最新文章

 

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，International Journal of Plasticity 2 篇，Thin-Walled Structures 2 篇

International Journal of Solids and Structures

Modeling the electromechanical behavior of fiber-like dielectric elastomer actuator

Yu Zhu, Meng-Ting Xu, Zhi-Han Chen, Ting Fan, Zhen-Hua Tang, Yuan-Qing Li, Shao-Yun Fu

doi:10.1016/j.ijsolstr.2025.113669

类纤维介电弹性体作动器机电性能建模

Due to their excellent electrode-dielectric interfaces, straightforward fabrication process, lightweight, and slender structure, fiber-like dielectric elastomer actuators (DEAs) with axial deformation have broader application prospects than classical sandwich-configuration DEAs in soft robotics and are receiving increasing attention. However, the corresponding theoretical work is far behind of experimental research. Herein, a coaxial fiber-like DEA consisting of electrode core-dielectric annulus-electrode shell layout is proposed, and a nonlinear thermodynamic model is established to elucidate its electromechanical coupling behavior. Meanwhile, the standard linear solid rheological model is used to characterize the dielectric elastomer’s viscoelastic behavior. Subsequently, the static and dynamic electromechanical responses of the fiber-like DEAs are an alyzed numerically, and the effects of material and structural parameters on the electromechanical behaviors are demonstrated. Theoretical calculation results indicate that coaxial fiber-like architecture could effectively suppress the electromechanical instability and achieve higher axial strain than tube-like hollow counterparts under equivalent electric fields. Moreover, decreasing the viscoelasticity and the thickness of the dielectric layer can effectively increase actuation strain. Finally, to verify the validity of the theoretical framework, the actuation performance of the fiber-like DEAs fabricated through one-step co-extrusion technique is measured. The theoretical predictions show good agreement with the experimental results, conclusively validating the effectiveness of the proposed model. This research establishes a theoretical groundwork for the design and optimization of fiber-like DEAs and provides critical guidelines for developing high-performance fiber-like DEAs for applications in soft robotics.

具有轴向变形的类纤维介电弹性体致动器（DEAs）由于具有优良的电极-介电界面、制作工艺简单、重量轻、结构纤细等优点，在软机器人中比经典的三明治结构DEAs具有更广阔的应用前景，受到越来越多的关注。然而，相应的理论工作远远落后于实验研究。提出了一种由电极芯-介电环-电极壳结构组成的同轴类纤维DEA，并建立了非线性热力学模型来解释其机电耦合行为。同时，采用标准的线性固体流变模型来表征介电弹性体的粘弹性行为。在此基础上，通过数值模拟分析了类纤维dea的静、动态机电响应，论证了材料参数和结构参数对其机电性能的影响。理论计算结果表明，在等效电场作用下，同轴类纤维结构比管状空心结构能有效抑制机电失稳，获得更高的轴向应变。减小介质层厚度和粘弹性可以有效地增加驱动应变。最后，为了验证理论框架的有效性，通过一步共挤压技术制备的类纤维DEAs的驱动性能进行了测试。理论预测结果与实验结果吻合较好，最终验证了模型的有效性。本研究为类纤维dea的设计和优化奠定了理论基础，并为开发应用于软机器人的高性能类纤维dea提供了重要指导。

Journal of the Mechanics and Physics of Solids

Microstructure-informed hyper-viscoelastic model capturing soft tissue tensile behavior across large deformations

Lei Shi, Kristin Myers

doi:10.1016/j.jmps.2025.106348

微观结构信息的超粘弹性模型捕捉软组织拉伸行为跨越大变形

Soft biological tissues exhibit highly nonlinear and time-dependent mechanical behavior arising from their complex collagen network microstructure. In this study, we present a unified, microstructure-informed hyper-viscoelastic constitutive model that captures the tensile response of soft tissues across s mall to large deformations under monotonic tension. The model couples a continuous fiber recruitment formulation—realized through a generalized Maxwell framework—with a physically motivated flow rule representing constrained segmental mobility. This time-dependent mechanis m, inspired by reptation- and Brownian-like dynamics, captures viscoelastic relaxation governed by localized fibrillar rearrangement, interfibrillar sliding, and motion in loosely crosslinked regions. The formulation is thermodynamically consistent and includes explicit expressions for the tangent modu li to ensure computational stability in finite element simulations. The model was calibrated and validated using multi-step stress-relaxation experiments performed on human cervix specimens from both pregnant and nonpregnant individuals, revealing physiologically meaningful trends in fiber recruitment and viscoelastic properties. Notably, the model is capable of predicting faster relaxation responses using parameters calibrated from slower-relaxation data, demonstrating robustness across different strain rates. To demonstrate generalizability, the model was further applied to published datasets from rat subcutaneous tissue and bovine tendon, accurately capturing their viscoelastic responses. Compared to classical viscoelastic models, the proposed framework offers improved accuracy and mechanistic interpretability by explicitly linking macroscopic behavior to underlying collagen network structure and crosslinking density. This work provides a foundation for robust, microstructure-informed modeling of soft tissue mechanics and has broad applicability in tissue characterization and digital twin development.

软体生物组织由于其复杂的胶原网状结构而表现出高度非线性和时间依赖性的力学行为。在这项研究中，我们提出了一个统一的、微观结构信息的超粘弹性本构模型，该模型捕获了在单调张力下软组织从小到大变形的拉伸响应。该模型将连续光纤补充公式（通过广义Maxwell框架实现）与表示受限段迁移率的物理驱动流规则耦合在一起。这种依赖时间的机制，受到重复和布朗动力学的启发，捕捉由局部纤维重排、纤维间滑动和松散交联区域运动控制的粘弹性松弛。该公式在热力学上是一致的，并且包含了切线模的显式表达式，以确保有限元模拟中的计算稳定性。该模型通过对孕妇和非孕妇宫颈标本进行多步骤应力松弛实验进行校准和验证，揭示了纤维招募和粘弹性特性的生理意义趋势。值得注意的是，该模型能够使用从慢弛豫数据校准的参数预测更快的弛豫响应，证明了在不同应变速率下的鲁棒性。为了证明其普遍性，该模型进一步应用于大鼠皮下组织和牛肌腱的公开数据集，准确地捕获了它们的粘弹性反应。与经典粘弹性模型相比，该框架通过明确地将宏观行为与潜在的胶原网络结构和交联密度联系起来，提高了准确性和机制可解释性。这项工作为强健的、微观结构的软组织力学建模提供了基础，并在组织表征和数字孪生开发中具有广泛的适用性。

Mechanics of Materials

A micromechanical rate-dependent friction-damage model for quasi-brittle materials under quasi-static compressive loading

Lunyang Zhao, Weichang Zou, Jianwei Xiao, Xinwen Wang, Yan Tian, Zipeng Qin, Zhaoming Lv, Pengfei Li

doi:10.1016/j.mechmat.2025.105505

准静态压缩载荷下准脆性材料的微力学速率相关摩擦损伤模型

This study proposes a novel micromechanical constitutive model to describe the quasi-static compressive behavior of quasi-brittle materials over a strain rate range of 10−5/s to 1/s. The material is idealized as an elastic matrix embedded with randomly distributed penny-shaped microcracks under the assumption of infinitesimal deformation. The model incorporates the Mori–Tanaka homogenization scheme to account for microcrack interactions, a rate-dependent friction law inspired by rate-and-state friction (RSF) theory to characterize plastic deformation, and a strain-rate sensitive damage law to capture microcrack induced damage evolution. A coupled plasticity-damage framework yields a macroscopic strength criterion that quantitatively links microscale mechanis ms with macroscopic strength. For computational efficiency, a semi-implicit decoupled correction algorithm is employed. The model is validated against quasi-static triaxial compression experiments conducted on Bukit Timah granite, mudstone and concrete under varying confining pressures and strain rates. Numerical results show excellent agreement with experimental observations, accurately reproducing strain-rate sensitivity, strength enhancement, and failure characteristics.

本研究提出了一种新的微观力学本构模型来描述准脆性材料在应变速率10−5/s至1/s范围内的准静态压缩行为。在无限小变形假设下，将材料理想化为嵌入随机分布的便士状微裂纹的弹性矩阵。该模型结合了Mori-Tanaka均质化方案来解释微裂纹相互作用，由速率与状态摩擦（RSF）理论启发的速率相关摩擦定律来表征塑性变形，以及应变速率敏感损伤定律来捕捉微裂纹引起的损伤演变。塑性-损伤耦合框架产生宏观强度准则，定量地将微观机制与宏观强度联系起来。为了提高计算效率，采用了半隐式解耦校正算法。该模型通过武吉知马花岗岩、泥岩和混凝土在不同围压和应变率下的准静态三轴压缩试验进行了验证。数值结果与实验结果非常吻合，准确地再现了应变率敏感性、强度增强和破坏特征。

International Journal of Plasticity

Hierarchical Nanoporous-based Design Strategy Towards Ductile Ceramics with Excellent Strain Hardening Capability

Zhuochen Chen, Wanghui Li, Oluwafunmilola Ola, Lanxi Feng, Xiaoqing Zhang, Yong-Wei Zhang, Xiaohu Yao

doi:10.1016/j.ijplas.2025.104487

基于分层纳米孔的应变硬化韧性陶瓷设计策略

Overcoming the inherent brittleness of ceramics is a longstanding, unsolved challenge in materials science and engineering. Here, we demonstrate a new effective strategy to achieve a brittle-ductile transition in ceramics by introducing a hierarchical spinodal structure. Combining phase field method and molecular dynamics (MD) method, we first constructed nanoporous SiC samples with 1-level and hierarchical 2-level structures separately using a phase field method whose rationality is well validated, featuring spinodal topologies. Then, the mechanical response of the nanoporous ceramics under compression is investigated by all-atom MD simulations to discover the underlying nanoscale deformation mechanis ms. The results revealed that the 1-level nanoporous SiC samples exhibited conventional brittleness due to stress-concentration-induced cracking; in stark contrast, the hierarchical 2-level samples displayed a ductile, strain-hardening, metal-like behavior, which is attributed to the presence of dispersed nuclei of defects like stacking faults, which effectively dispersed stress and prevented stress-concentration-induced failure. The strength of the hierarchical nanoporous ceramics follows Shi's law rather than classical Gibson-Ashby law. Our study not only elucidates the two distinct deformation mechanis ms but also introduces a highly effective hierarchical nanoporous strategy for the design of ductile ceramics with excellent strain hardening capability, addressing the enduring challenge of brittleness in ceramics.

克服陶瓷固有的脆性是材料科学与工程中一个长期未解决的难题。在这里，我们展示了一种新的有效策略，通过引入分层spinodal结构来实现陶瓷的脆性-韧性转变。结合相场法和分子动力学（MD）方法，我们首次采用相场法分别构建了1级和2级结构的纳米多孔SiC样品，其合理性得到了很好的验证，具有spinodal拓扑结构。然后，采用全原子MD模拟方法研究了纳米孔陶瓷在压缩条件下的力学响应，揭示了纳米尺度下的变形机制。结果表明：1级纳米多孔碳化硅样品由于应力集中引起的裂纹表现为常规脆性；与此形成鲜明对比的是，层次化的2级样品表现出延展性、应变硬化、类金属的行为，这是由于层错等缺陷的分散核的存在，有效地分散了应力，防止了应力集中引起的破坏。分层纳米多孔陶瓷的强度遵循施定律，而不是经典的吉布森-阿什比定律。我们的研究不仅阐明了两种不同的变形机制，而且还引入了一种高效的分层纳米多孔策略，用于设计具有优异应变硬化能力的韧性陶瓷，解决了陶瓷脆性的长期挑战。

Architecting micro-and nanoscale heterostructure for exceptional strength-ductility synergy in additively manufactured titanium alloy

Fu Chen, Huaqiang Liu, Yuanfei Han, Jiaming Zhang, Xiaoyan Wang, Yongqiang Ye, Chunyu Shen, Yimin Zhuo, Jianwen Le, Guangfa Huang, Weijie Lu, Di Zhang

doi:10.1016/j.ijplas.2025.104488

在增材制造钛合金中构建微纳米异质结构以实现卓越的强度-延性协同作用

Strength-ductility trade-off in additively manufactured titanium alloys has been a critical bottleneck, significantly limiting their engineering applications. Our work demonstrated that this dilemma was overcome by tailoring a hierarchical heterostructure (HHS) in laser-directed energy deposited titanium alloy (Ti-6.5Al-3.5Mo-1.5Zr-0.3Si). The designed HHS consisted of coarse micro-sized α phases (αp, soft region) and ultrafine nano-sized α precipitates (αs, hard region), generating hierarchical heterointerfaces including microscale αp/βt and nanoscale αs/βr interfaces. The HHS enhanced the total elongation to failure by 476.2% without sacrificing strength compared to the conventional α-β lamella structure, achieving exceptional strength-ductility synergy. Micro/nano-scale mechanical deformation an alyses showed that hetero-deformation between coarse αp and ultrafine αs regions caused noticeable accumulation of geometrically necessary dislocations (GNDs) at heterointerfaces, inducing the pronounced hetero-deformation induced (HDI) strengthening effect on the soft αp, and the HDI hardening effect improving ductility. The HDI stress facilitated the formation and growth of dislocation networks in soft αp, promoting the accumulation of interfacial GNDs, enhancing the HDI hardening effect. Compared to single-level α/β interfaces, hierarchical heterointerface generated higher GND density with a dual-gradient distribution, further improving the HDI stress and producing multiscale HDI hardening. This resultant high HDI stress activated high-proportioned pyramidal <c+a> slip modes with significant increment of GND density, overcoming deformation incompatibility. Moreover, hierarchical heterointerface exhibited a multi-scale crack buffering effect, synergistically contributing to the excellent ductility. Finally, a two-level homogenization model was established to comprehensively elucidate the intrinsic strengthening-toughening mechanis m of the HHS. This work provided theoretical guidance for developing additively manufactured titanium alloys with high-performance.

增材制造钛合金的强度与延性权衡一直是制约其工程应用的关键瓶颈。我们的工作表明，通过在激光定向能沉积的钛合金（Ti-6.5Al-3.5Mo-1.5Zr-0.3Si）中定制分层异质结构（HHS）可以克服这一难题。设计的HHS由粗大的微尺度α相（αp，软区）和超细的纳米尺度α相（αs，硬区）组成，形成了微尺度αp/βt和纳米尺度αs/βr界面的分层异质界面。与传统的α-β片层结构相比，HHS在不牺牲强度的情况下将总延伸率提高了476.2%，实现了优异的强度-延性协同效应。微纳尺度的力学变形分析表明，αp粗区和αs超细区之间的异质变形导致异质界面上明显的几何必要位错（GNDs）积累，对软αp产生明显的异质变形诱导（HDI）强化作用，HDI硬化作用提高了塑性。HDI应力促进了软αp中位错网络的形成和生长，促进了界面GNDs的积累，增强了HDI硬化效果。与单能级α/β界面相比，分层异质界面以双梯度分布产生更高的GND密度，进一步提高了HDI应力，产生了多尺度HDI硬化。由此产生的高HDI应力激活了高比例锥体<c+a>滑移模式，并显著增加GND密度，克服了变形不相容。此外，分层异质界面具有多尺度的裂纹缓冲作用，协同促进了优异的延性。最后，建立了两级均匀化模型，全面阐明了HHS的内在强韧机理。该工作为开发高性能增材钛合金提供了理论指导。

Thin-Walled Structures

Experimental Investigation into the Axial Compressive Buckling Behavior of LQ550 Cold-formed Channel Columns with Web Openings

Dengfeng Wang, Jingwen Wang, Siyang Liu, Zhengyong Liu, Baoping Zhong

doi:10.1016/j.tws.2025.114017

LQ550带腹板开口冷弯槽柱轴向压缩屈曲行为试验研究

In recent years, cold-formed thin-walled steel members have been extensively utilized in prefabricated structures owing to their lightweight and high-strength properties. However, openings in the column web for accommodating water, electricity, heating, and ventilation ducts significantly affect the axial compressive bearing capacity, warranting a comprehensive investigation. This study conducts axial loading tests on LQ550 high-strength cold-formed thin-walled steel channel sections with web openings. The findings indicated that the presence of openings does not significantly affect the buckling mode; however, it intensifies the magnitude of buckling deformation and diminishes the bearing capacity of the columns. Short columns with openings predominantly undergo distortional-local buckling, while long columns exhibit distortional-local-global interactive buckling. The openings affect the location of buckling in the column. Local and distortional buckling in columns with varying heights predominantly occurs in the vicinity of the openings. However, for slender columns, the correlation between the position of maximum global deflection and the opening locations is negligible. The opening size exhibits the most significant impact on bearing capacity, followed by the number of openings, while the opening shape demonstrates the least effect. For the same number of openings, although sections with wide web exhibit a wider range and degree of local buckling around the openings, the reduction in bearing capacity for narrow-web sections is more pronounced. Finally, a conservative recommendation for the reduction coefficient of bearing capacity for the perforated columns is proposed.

近年来，冷弯薄壁钢构件以其轻量化、高强的特点在预制结构中得到了广泛的应用。然而，用于容纳水、电、供暖和通风管道的柱腹板开口显著影响轴压承载力，需要进行全面调查。本文对LQ550高强度冷弯薄壁带腹板开口槽钢进行了轴向加载试验。结果表明，孔洞的存在对屈曲模态没有显著影响；然而，它加剧了柱的屈曲变形，降低了柱的承载能力。有开口的短柱主要发生扭曲-局部屈曲，而长柱则表现为扭曲-局部-全局相互作用屈曲。开孔影响柱内屈曲的位置。不同高度柱的局部屈曲和变形屈曲主要发生在孔洞附近。然而，对于细长柱，最大总挠度位置与开口位置之间的相关性可以忽略不计。孔口尺寸对承载力影响最大，孔口数量次之，孔口形状影响最小。对于相同数量的开口，虽然宽腹板截面在开口周围表现出更大的范围和程度的局部屈曲，但窄腹板截面的承载力下降更为明显。最后，提出了穿孔柱承载力折减系数的保守建议。

Eigen-Value An alysis of Kresling Modules: A Systematic Approach to Designing Arm-Like Origami Structures

Seyed Masoud Alipour, Jamal Arghavani

doi:10.1016/j.tws.2025.114016

Kresling模的特征值分析：一种设计臂状折纸结构的系统方法

This study introduces a systematic framework for the geometric design of arm-like origami structures constructed from Kresling modules, leveraging comprehensive mechanical modeling and eigenvalue a nalysis. A generalized six-degree-of-freedom (6-DOF) truss model is developed to capture both axial and off-axis deformations of the Kresling module under quasi-static loading conditions. The model enables accurate prediction of the module’s mechanical behavior and is validated through comparison with experimental and finite element results. By performing eigenvalue an alysis on the linearized governing equations, the dominant deformation modes, specifically folding and bending, are identified, and their associated stiffness characteristics are quantified. These insights are used to construct a set of dimensionless design maps that link geometric parameters to mechanical performance, guiding the selection of module configurations tailored to specific application requirements. The proposed methodology supports the efficient and scalable design of adaptive, reconfigurable arm-like structures using symmetric bistable Kresling modules, with potential applications in soft robotics, deployable devices, and flexible mechanis ms.

本研究采用综合力学建模和特征值分析的方法，为由Kresling模块构建的类臂折纸结构的几何设计提供了一个系统框架。建立了一种广义的六自由度桁架模型，用于描述Kresling模块在准静态加载条件下的轴向和离轴变形。该模型能够准确预测模块的力学行为，并通过与实验和有限元结果的比较进行验证。通过对线性化控制方程进行特征值分析，确定了主要的变形模式，特别是折叠和弯曲，并量化了它们的相关刚度特性。这些见解用于构建一组无量纲设计图，将几何参数与机械性能联系起来，指导根据特定应用要求定制模块配置的选择。所提出的方法支持使用对称双稳态Kresling模块的自适应、可重构臂状结构的高效可扩展设计，在软机器人、可部署设备和灵活机构中具有潜在的应用前景。