【新文速递】2025年9月10日固体力学SCI期刊最新文章

今日更新：International Journal of Solids and Structures 2 篇，Journal of the Mechanics and Physics of Solids 2 篇，Mechanics of Materials 1 篇，Thin-Walled Structures 6 篇International Journal of Solids and StructuresMultiscale a nalysis and texture design for hydrodynamically lubricated interfaces with variable viscosity and density liquidsSarp Ilgaz Koç, İlker Temizer, Luca Biancofioredoi:10.1016/j.ijsolstr.2025.113640变黏度和密度流体动力润滑界面的多尺度分析和织构设计In this work, a numerical framework is developed for the an alysis and design of textured interfaces with piezoviscous, compressible and shear-thinning lubricants. This framework is based on a modified viscosity approach alongside homogenization as a mathematical technique for the upscaled solution of the Reynolds equation to alleviate the inherent computational difficulties to model roughness. Good agreement is observed between (i) direct numerical simulations, (ii) nonlinear Reynolds equation results and (iii) homogenized Reynolds equation results. Furthermore, the developed numerical framework has been used in conjunction with a topology optimization algorithm to design different surface textures that are dependent on the fluid rheology. These textures are shown to (i) minimize energy dissipation, or (ii) increase the traction to amplify the grip between the surfaces depending on the respective lubrication application.在这项工作中，开发了一个数值框架，用于分析和设计具有压粘性，可压缩和剪切稀化润滑剂的纹理界面。该框架是基于改进的粘度方法和均质化作为雷诺方程升级解的数学技术，以减轻模型粗糙度固有的计算困难。在(i)直接数值模拟，（ii）非线性雷诺方程结果和（iii）均匀化雷诺方程结果之间观察到良好的一致性。此外，所开发的数值框架已与拓扑优化算法结合使用，以设计依赖于流体流变的不同表面纹理。这些纹理显示：(1)最小化能量耗散，或(2)根据各自的润滑应用增加牵引力以扩大表面之间的抓地力。Cylindrical corrugated shell structures in vibration an alysis: A comprehensive study on lower and higher order theoriesMohammad Rahmaniandoi:10.1016/j.ijsolstr.2025.113643振动分析中的圆柱波纹壳结构：低阶和高阶理论的综合研究This study offers an extensive and unified semi-an alytical framework to compare a wide range of polynomial and non-polynomial theories concerning the free vibration of innovative shell configurations. The focus is on shell structures characterized by planforms that are either convex/concave or corrugated-shaped with a circular cross-section. A general formulation is employed, representing multiple theoretical approaches from classical to quasi-3D theories with/without normal/shear deformations. The general governing equations of motion are derived using Hamilton’s principle. The solution procedure is based on the Jacobi-Ritz method, where incorporation of orthogonal polynomials enhances the convergence rate and solution stability. Additionally, a spring penalty approach is implemented to enable modeling all combinations of classical and elastic boundary conditions. This provides an additional layer of versatility, enabling the formulation to adapt to different boundary restraint scenarios. The prominent novelties of this study includes, the development of a generalized mathematical model capable of accommodating convex, concave, and corrugated cylindrical shell geometries. This model is not only generalized but also optimized for rapid convergence, ensuring that the solutions are both reliable and computationally efficient. Moreover, the study provides a comprehensive comparison of various theoretical frameworks, providing insights into their respective strengths and limitations when applied to such complex geometries.本研究提供了一个广泛而统一的半解析框架来比较关于创新壳体构型自由振动的各种多项式和非多项式理论。重点是壳结构的特点是平台，要么是凸/凹或波纹形状与圆形截面。采用了一个通用的公式，代表了从经典到准三维理论的多种理论方法，有/没有法向/剪切变形。利用哈密顿原理推导出一般的运动控制方程。求解过程基于Jacobi-Ritz方法，其中正交多项式的加入提高了收敛速度和解的稳定性。此外，还实现了一种弹簧惩罚方法，以便对经典和弹性边界条件的所有组合进行建模。这提供了额外的多功能性，使公式能够适应不同的边界约束场景。这项研究的突出新颖之处包括，发展了一个能够容纳凸、凹和波纹圆柱壳几何形状的广义数学模型。该模型不仅进行了广义化，而且进行了快速收敛优化，保证了解的可靠性和计算效率。此外，该研究还提供了各种理论框架的全面比较，提供了在应用于此类复杂几何形状时各自优势和局限性的见解。Journal of the Mechanics and Physics of SolidsOn universal deformations of compressible Cauchy elastic solids reinforced by inextensible fibersArash Yavaridoi:10.1016/j.jmps.2025.106340不可拉伸纤维增强可压缩柯西弹性固体的普遍变形Universal deformations are those that can be maintained in the absence of body forces and with boundary tractions alone, for all materials within a given constitutive class. We study the universal deformations of compressible isotropic Cauchy elastic solids reinforced by a single family of inextensible fibers. We consider straight fibers parallel to the Cartesian Z -axis in the reference configuration and derive the associated universality constraints, which depend explicitly on the geometry of the deformed fibers. We study universal deformations in two cases: (i) deformed fibers are straight lines, and (ii) deformed fibers have non-vanishing curvature. For case (i), we provide a complete classification. Assuming that at least one principal invariant of the right Cauchy–Green tensor is not constant, we show that the deformed fiber direction must be an eigenvector of the Finger tensor, and the invariants depend only on the fiber arclength parameter. The universality constraints reduce to geometric restrictions on the orthogonal surfaces, which must be planes, circular cylinders, or spheres. This gives one inhomogeneous universal deformation family: the non-isochoric Family Z 1 of combined bending and stretching deformations. In addition, Family 0 Z consists of homogeneous deformations that respect the inextensibility constraint. We further show that if all principal invariants are constant and deformed fibers remain straight, then only homogeneous universal deformations are possible. For case (ii), when deformed fibers have non-vanishing curvature, the universality constraints become significantly more complex. We show that the three principal invariants are functionally dependent and that the binormal to the deformed fibers is an eigenvector of the Finger tensor. The existence of universal deformations in this case remains an open problem. In particular, we demonstrate that Family 5 universal deformations of incompressible elasticity, when restricted to satisfy the inextensibility constraint, are no longer universal in fiber-reinforced solids. Finally, we prove that the universal deformations of Cauchy and hyperelastic solids with the same fiber reinforcement coincide. Our results provide the first systematic classification of universal deformations for compressible isotropic fiber-reinforced solids and include a new inhomogeneous family. These solutions may serve as benchmark problems for numerical methods.普遍变形是指在没有物体力的情况下，对于给定本构类内的所有材料，仅存在边界牵引力就能保持的变形。研究了单科不可拉伸纤维增强可压缩各向同性柯西弹性固体的普遍变形。我们考虑在参考构型中平行于直角Z轴的直纤维，并推导出相关的普适约束，这些约束明确地依赖于变形纤维的几何形状。我们研究了两种情况下的普遍变形：(i)变形纤维是直线，（ii）变形纤维具有不消失的曲率。对于情形(i)，我们提供了一个完整的分类。假设右Cauchy-Green张量的至少一个主不变量不恒定，我们证明了变形纤维的方向必须是Finger张量的特征向量，并且不变量仅依赖于纤维的弧长参数。普适性约束归结为正交表面上的几何约束，这些正交表面必须是平面、圆柱体或球体。这就给出了一个非均匀的通用变形族：弯曲和拉伸变形的非等时族z1。此外，族0z由尊重不可拓性约束的齐次变形组成。我们进一步证明了如果所有的主不变量都是常数并且变形纤维保持直，那么只有齐次泛变形是可能的。对于情形（ii），当变形纤维具有不消失曲率时，普适性约束明显变得更加复杂。我们证明了三个主不变量是函数相关的，并且变形纤维的二法线是Finger张量的特征向量。在这种情况下，普遍变形的存在仍然是一个悬而未决的问题。特别地，我们证明了不可压缩弹性的第5族通用变形，当被限制为满足不可扩展约束时，在纤维增强固体中不再是通用的。最后，我们证明了具有相同纤维增强的柯西固体和超弹性固体的普遍变形是一致的。我们的结果提供了可压缩各向同性纤维增强固体的普遍变形的第一个系统分类，并包括一个新的不均匀族。这些解可以作为数值方法的基准问题。On the role of effective temperature and dislocation microstructures on the mechanochemical effect in corrosion crackingY. Piao, J.Y.S. Lee, M.R. Wenman, D.S. Balintdoi:10.1016/j.jmps.2025.106341有效温度和位错组织对腐蚀裂纹力学化学效应的影响In this paper, we bring together the mechanochemical effect in corrosion cracking with the thermodynamic theory of plasticity. The incorporation of effective temperature (or its dual variable — the configurational entropy of dislocations), which has been previously overlooked in the modelling, enables the derivation of thermodynamically consistent formulations for both the chemical potential of dislocations and the mechanochemical effect. This approach enables consideration of the influence of different dislocation distributions. If the change in effective temperature (quantifying the configurational disorder of dislocations) is ignored, the formulation of the mechanochemical effect simplifies to the widely-used model proposed by Gutman (1994). The key quantities to evaluate the mechanochemical effect can be obtained within the framework of thermodynamic dislocation theory (TDT); using a few physical parameters extracted from plane strain testing at different strain rates, numerical simulations have been conducted and compared with experimental results for 316L stainless steel, showing good agreement with both stress–strain mechanical and corrosion current density tests. In this study, rather than being used to pass parameters into the corrosion model, the mechanical response is employed to validate the model’s ability to capture the coupled mechanochemical behaviour. Furthermore, different heterogeneous dislocation microstructures are constructed to examine their effect on the mechanochemical behaviour. It is found that, despite producing similar hydrostatic stresses, the mechanochemical effect varies depending on the underlying microstructural configuration, which demonstrates the importance of incorporating dislocation distributions into models of stress corrosion cracking.本文将腐蚀开裂的力学化学效应与塑性的热力学理论结合起来。有效温度（或其对偶变量——位错的构型熵）的结合，以前在建模中被忽视，使得推导出位错的化学势和机械化学效应的热力学一致的公式成为可能。这种方法可以考虑不同位错分布的影响。如果忽略有效温度的变化（量化位错的构型紊乱），则将力学化学效应的表述简化为Gutman（1994）提出的广泛使用的模型。在热力学位错理论（TDT）的框架下，可以得到评价力学化学效应的关键量；利用不同应变速率下平面应变试验提取的少量物理参数，对316L不锈钢进行了数值模拟，并与试验结果进行了比较，结果与应力-应变力学试验和腐蚀电流密度试验结果吻合较好。在这项研究中，力学响应不是用来将参数传递到腐蚀模型中，而是用来验证模型捕捉耦合力学化学行为的能力。此外，构建了不同的非均相位错微观结构来研究它们对力学化学行为的影响。研究发现，尽管产生了相似的静水应力，但机械化学效应取决于潜在的微观结构配置，这表明了将位错分布纳入应力腐蚀开裂模型的重要性。Mechanics of MaterialsEarly age Creep behavior of 3D Printable Mortar: Hydration and Viscoelasticity Coupling ModelPradeep S, Ananth Ramaswamydoi:10.1016/j.mechmat.2025.1054843D打印砂浆的早期蠕变行为：水化-粘弹性耦合模型Early age creep significantly influences buildability in extrusion-based 3D concrete printing(3DCP). This time-dependent deformation is primarily governed by the evolution of mechanical properties resulting from early-stage cement hydration. However, the role of hydration-induced aging in early age creep has received limited attention in prior research. In this study, a hydration model based on water diffusion in the alite (C3S) phase was employed to predict the evolution of the degree of hydration up to the dormant period. This evolution was then coupled with Burger’s viscoelastic model parameters using a simplified power-law relationship to account for aging effects. A finite element-based numerical framework was developed to simulate the early-age creep behavior of printable mortar using this hydration–viscoelastic coupled model. The proposed model’s capability was demonstrated using three printable mortar mixes reported in the literature, highlighting its effectiveness in capturing the time-dependent response during the early stages of the 3D printing process. Furthermore, a local sensitivity an alysis was performed to identify the most influential model parameter governing the model’s predictive performance.早期龄期蠕变显著影响挤压混凝土3D打印（3DCP）的可建造性。这种随时间变化的变形主要是由早期水泥水化引起的力学性能演变所决定的。然而，在先前的研究中，水合老化在早期蠕变中的作用受到了有限的关注。本研究采用基于水在alite （C3S）相中扩散的水化模型来预测水化程度直至休眠期的演变。然后将这种演变与Burger的粘弹性模型参数结合使用简化的幂律关系来解释老化效应。建立了基于有限元的数值框架，利用该水化-粘弹性耦合模型模拟可打印砂浆的早期蠕变行为。使用文献中报道的三种可打印砂浆混合物证明了所提出模型的能力，突出了其在3D打印过程早期阶段捕获时间相关响应的有效性。此外，进行了局部敏感性分析，以确定控制模型预测性能的最具影响力的模型参数。Thin-Walled StructuresA nalysis of modal and damping characteristics of irregular s mart composite laminated plates under incompletely constrained boundariesYu Zhang, Hui Zhang, Hongwei Ma, Wei Sun, Dongxu Du, Kunpeng Xu, Hui Lidoi:10.1016/j.tws.2025.113918非完全约束边界下异形智能复合材料层合板模态及阻尼特性分析Studies on active vibration suppression and vibration an alysis of integrated composite sandwich plates (ICSPs) embedded macro-fiber composites (MFC) have been rarely studied in previous papers, especially with incompletely constrained boundaries and irregular geometric shapes. This paper aims to provide a new structural design for thin-walled structures such as aircraft wings to improve the anti-vibration capability and study the influence of incompletely constrained boundaries on the modal and damping characteristics of integrated structures. A dynamic modeling framework for ICSPs that accounts for the piezoelectric effect is constructed by integrating the first-order shear deformation theory (FSDT) with Lagrange's equations. The influences of irregular geometric shapes and incomplete constraint are introduced into the model through coordinate mapping and artificial spring technology. A relevant experimental test system has been established. For the natural frequency results calculated by the method in this paper, the maximum errors compared with the experimental results and finite element results are 3.26% and 1.75%, respectively. The mode shapes and damping ratio results are consistent. The vibration reduction amplitude reaches 45.6%. The accuracy of the developed modeling approach and the vibration-damping performance of the ICSP are validated. Moreover, the frequency veering behavior caused by the change in the position of the incomplete constraint segment is an alyzed, and some interesting phenomena caused by the change in the length of the constraint segment are revealed. The influences of boundary conditions and control parameters on the damping performance of the ICSP are discussed. Some research results in this study can provide a helpful reference for the anti-vibration design of similar thin-walled structures.对于集成复合材料夹层板嵌入宏纤维复合材料（MFC）的主动振动抑制和振动分析，以往的研究很少，特别是在边界不完全约束和几何形状不规则的情况下。本文旨在为飞机机翼等薄壁结构提供一种新的结构设计，以提高其抗振能力，并研究不完全约束边界对整体结构模态和阻尼特性的影响。将一阶剪切变形理论（FSDT）与拉格朗日方程相结合，建立了考虑压电效应的ICSPs动力学建模框架。通过坐标映射和人工弹簧技术，引入不规则几何形状和不完全约束对模型的影响。建立了相应的实验测试系统。对于本文方法计算的固有频率结果，与实验结果和有限元结果的最大误差分别为3.26%和1.75%。模态振型和阻尼比结果是一致的。减振幅度达45.6%。验证了所建立的建模方法的准确性和ICSP的减振性能。分析了不完全约束段位置变化引起的频率转向行为，揭示了约束段长度变化引起的一些有趣现象。讨论了边界条件和控制参数对ICSP阻尼性能的影响。本文的一些研究成果可为类似薄壁结构的抗振设计提供有益的参考。Flexural behavior of steel beams with double corrugated webs: Experimental and ana lytical investigationsRui Pang, Ruirui Yuan, Shiling Liu, Longji Dang, Hongbing Lei, Yong Ludoi:10.1016/j.tws.2025.113929双波纹腹板钢梁的弯曲性能：实验和分析研究Corrugated web steel beams (CWS Bs) have been widely used in engineering structures due to the benefits of light weight and superior bearing capacity. Normally, traditional CWS Bs where prefabricated floor slabs are installed on the top flange of the steel beams, resulting in the reduction of ceiling height, and increasing waste of available space and material. In view of this, an innovative steel beam with double corrugated webs (S BDCW) which can be applied in ordinary frame and heavy-duty frame structures, was developed to solve the above typical limitations for conventional CWS B structures. To investigate the effect of thin-walled corrugated steel webs (TCSWs) on the flexural of S BDCWs, flexural tests of seven specimens while varying the critical parameters were conducted to reveal the failure modes of S BDCWs and collaborative work mechanis m between TCSWs and flanges. The test results showed that there was a shear lag effect in steel flanges, and the accordion effect of TCSWs was observed based on the strain an alysis of web. Subsequently, a finite element model was developed and a parameter study was also conducted to further evaluate the influences of web thickness, web angle and beam height on the flexural behavior of S BDCWs. Furthermore, an an alytical method for predicting the ultimate flexural capacity of S BDCWs was proposed fully taking into account the shear lag effect of flanges, contribution and accordion effect of TCSWs. The calculated results were in good agreement with the test and FEA values, indicating that the proposed methods can accurately predict ultimate flexural capacity of S BDCWs. In summary, this research can provide references and foundations for the design, investigation and application of thin-walled CWS Bs in ordinary and heavy-duty frame structures.波纹腹板钢梁由于具有重量轻、承载能力强等优点，在工程结构中得到了广泛的应用。通常，传统的cws b将预制楼板安装在钢梁的顶部法兰上，导致天花板高度降低，增加了可用空间和材料的浪费。鉴于此，为了解决传统波纹腹板结构的上述典型局限性，开发了一种适用于普通框架和重型框架结构的创新双波纹腹板钢梁（S BDCW）。为研究薄壁波纹钢腹板对薄壁波纹钢腹板抗弯性能的影响，通过对7个薄壁波纹钢腹板试件进行不同关键参数的抗弯试验，揭示薄壁波纹钢腹板的破坏模式以及薄壁波纹钢腹板与法兰的协同工作机制。试验结果表明，钢法兰存在剪切滞后效应，通过腹板应变分析，观察到tcsw的手风琴效应。随后，建立了有限元模型，并进行了参数研究，以进一步评估腹板厚度、腹板角度和梁高对S BDCWs抗弯性能的影响。在此基础上，提出了一种充分考虑翼缘剪力滞效应、翼缘剪力滞效应、翼缘剪力滞效应和翼缘剪力滞效应的翼缘剪力墙极限抗弯承载力预测分析方法。计算结果与试验和有限元分析结果吻合较好，表明该方法能较准确地预测结构的极限抗弯承载力。综上所述，本研究可为薄壁cws b在普通和重型框架结构中的设计、研究和应用提供参考和基础。A unified model for the second-order behavior of beam–columns prestressed by a follower tendonGérard-Philippe Zéhildoi:10.1016/j.tws.2025.113912 受从动筋预应力的梁柱二阶特性的统一模型This paper investigates the second-order elastic behavior of a beam–column prestressed by a follower tendon—a prestressing element that follows the lateral deformations of the beam–column but is assumed to carry a constant axial force. The proposed formulation captures geometric nonlinearities arising from axial compression, eccentric end moments, and distributed lateral loads, while incorporating the tendon–beam interaction directly into a single governing equation. Four complementary approaches—static equilibrium, differential equilibrium, energy minimization, and variational formulation—are employed to derive and validate the governing equation. This is, to the authors’ knowledge, the first formulation of a unified governing equation that captures the second-order and buckling behavior of beam–columns prestressed by a follower tendon. The model reveals key structural mechanis ms and eliminates the need for multi-body interaction models, thereby offering both an alytical clarity and computational efficiency. A notable feature of the formulation is that the destabilizing effect of tendon-induced axial compression is exactly counteracted by the tendon’s own distributed transverse action, thereby explaining why the prestressing force does not reduce the critical buckling load. An alytical solutions are obtained for canonical cases, and a Hermitian finite element implementation is developed for general geometries and loading profiles. The model is verified against commercial finite element software and applied to design-oriented tasks such as shape and tendon profile optimization. Offering a computationally efficient and theoretically grounded alternative to conventional multi-body tendon–beam models, the proposed approach is particularly well suited for inverse problems and structural optimization.本文研究了由跟随筋预应力的梁柱的二阶弹性行为-跟随梁柱的侧向变形的预应力元件，但假设其承受恒定的轴向力。提出的公式捕获了由轴向压缩、偏心端矩和分布的横向载荷引起的几何非线性，同时将肌腱-梁相互作用直接纳入单个控制方程。四种互补的方法-静态平衡，微分平衡，能量最小化和变分公式-被用来推导和验证控制方程。据作者所知，这是一个统一的控制方程的第一个公式，它捕获了由跟随者腱预应力的梁柱的二阶和屈曲行为。该模型揭示了关键的结构机制，消除了对多体相互作用模型的需要，从而提供了分析清晰度和计算效率。该公式的一个显著特征是，肌腱引起的轴向压缩的失稳效应恰好被肌腱自身分布的横向作用抵消，从而解释了预应力不能降低临界屈曲载荷的原因。得到了典型情况下的解析解，并开发了一般几何形状和加载剖面的厄米有限元实现。该模型通过商业有限元软件进行了验证，并应用于形状和肌腱轮廓优化等面向设计的任务。该方法为传统的多体肌腱梁模型提供了一种计算效率高、理论基础坚实的替代方案，特别适合于逆问题和结构优化。Coupling ratio and parametric an alysis of coupled steel plate shear wall based on orthogonal testXinghuang Wu, Jiping Hao, Yourong Jiang, Hang Fu, Xingbao Hou, Tong Oudoi:10.1016/j.tws.2025.113917基于正交试验的耦合钢板剪力墙耦合比及参数分析The contribution of coupling beams is usually reflected by coupling ratio. To determine the reasonable coupling ratio (CR), parametric an alysis of coupled steel plate shear wall (CSPSW) based on orthogonal test was done. Key parameters about the infill plate, boundary column, coupling beam and structure height were investigated. Firstly, the key parameters with different levels were arranged by orthogonal test table, thus representative combinations of the parameters were selected. Then, finite element models of the CSPSW corresponding to these parameter combinations were established, and cyclic loading simulation was conducted by ABAQUS, besides the cyclic behavior was summarized. Finally, a comprehensive evaluation index (Is) was constructed, and variance an alysis of this evaluation index was performed by statistic software SPSS. Through numerical simulation and statistical an alysis, the results show that the CSPSW models roughly start yielding at 1% roof drift, then hitting the peak load at 3% roof drift, and finally reaching the limit state before 5% roof drift. The average values of overstrength factor (Rf ) and ductility coefficient (μd ) are 1.25 and 5.28, respectively. The index Is 2 can reflect the properties of bearing capacity, ductility and energy consumption, while considering the economy. The CR of 0.6 is a critical turning point, and the CR of 0.6∼0.8 is suggested during the structure design, while the CR is finally recommended to be controlled within 0.64∼0.74 so that rational mechanical behavior can be obtained. Besides, the percentage of shear resisted by infill plates is summarized in 53%∼76% with an average of 64.4%.耦合梁的贡献通常用耦合比来反映。为确定合理的耦合比（CR），采用正交试验对耦合钢板剪力墙（CSPSW）进行参数分析。对填充板、边界柱、连接梁、结构高度等关键参数进行了研究。首先，通过正交试验表对不同水平的关键参数进行排序，选取具有代表性的参数组合；然后，建立了与这些参数组合相对应的CSPSW有限元模型，利用ABAQUS进行了循环加载仿真，并总结了循环行为。最后，构建综合评价指标Is，并利用SPSS统计软件对该评价指标进行方差分析。数值模拟和统计分析结果表明，CSPSW模型在顶板漂移1%时开始屈服，在顶板漂移3%时达到峰值荷载，最终在顶板漂移5%前达到极限状态。过强因子(Rf )和延性系数(μd )分别为1.25和5.28。指数是 2能体现承载力、延性和能耗等性能，同时兼顾经济性。0.6的CR是一个关键的转折点，在结构设计时建议将CR控制在0.6 ~ 0.8，而最终建议将CR控制在0.64 ~ 0.74之间，以获得合理的力学行为。填充板抗剪率为53% ~ 76%，平均为64.4%。Mechanical performance of FDM-printed PLA TPMS lattices under hydrothermal agingMeiyu Li, Yanan Xu, Chi Wu, Qing Li, Chengqing Wu, Jianguang Fangdoi:10.1016/j.tws.2025.113924 水热老化下fdm打印PLA TPMS晶格的力学性能Triply periodic minimal surface (TPMS) metamaterials exhibit superior mechanical properties, yet their response to hydrothermal aging remains largely unexplored. This study explores the hydrothermal aging behavior of TPMS lattice metamaterials with four distinct architectures, i.e., Primitive (P), Gyroid (G), Diamond (D) and I-Wrapped Primitive (IWP). The metamaterials were additively manufactured using fused deposition modeling (FDM) with polylactide (PLA) and subjected to water immersion at 50°C for up to 30 days. Compression tests showed that all the metamaterials lost load carrying capacity after 30 days of aging due to material degradation. The G and D lattices exhibited the highest retention of mechanical properties, maintaining 96% and 94% of their initial peak stresses after 18 days. This superior performance is attributed to more cycles of variation in their load-bearing areas. In contrast, the P lattice, with fewer variation cycles, exhibited the weakest mechanical properties and the largest increase in stress fluctuation. Notably, the IWP lattice was most sensitive to aging, with mechanical degradation beginning on day 7. Moreover, TPMS lattice metamaterials loaded perpendicular to the building direction ( ⊥ BD) degraded more rapidly than those loaded along the building direction ( ∥ BD). This was evident at the material level, where the interlayer bonding had half the tensile strength of the filaments and deteriorated significantly during aging, confirming interlayer debonding as the dominated failure mode. These findings highlight the importance of architecture and interlayer bonding in the aging behavior of 3D printed metamaterials.三周期最小表面（TPMS）超材料具有优异的力学性能，但其对热液老化的响应仍未得到充分研究。本研究探讨了四种不同结构的TPMS晶格超材料的水热老化行为，即原始(P)，陀螺(G)，金刚石(D)和i -包裹原始（IWP）。这些超材料使用聚乳酸（PLA）熔融沉积建模（FDM）进行增材制造，并在50°C下浸泡30天。压缩试验结果表明，经过30天的老化，所有超材料都因材料降解而失去了承载能力。G和D晶格的力学性能保持率最高，在18天后分别保持了其初始峰值应力的96%和94%。这种优越的性能是由于其承载区域的变化周期更多。而P晶格的力学性能最弱，应力波动幅度最大，变化周期较少。值得注意的是，IWP晶格对老化最敏感，机械降解开始于第7天。此外，垂直于建筑方向加载的TPMS晶格超材料（⊥BD）比沿建筑方向加载的材料（∥BD）降解得更快。这在材料层面上是很明显的，层间结合的抗拉强度只有长丝的一半，并且在老化过程中显著恶化，这证实了层间脱粘是主要的破坏模式。这些发现强调了结构和层间键合在3D打印超材料老化行为中的重要性。Underwater Implosion Protection Effect of a Novel Thin-walled Composite Structure: Experiment and SimulationXinyu Zhang, Shengxia Sun, Min Zhao, Tong Gedoi:10.1016/j.tws.2025.113930一种新型薄壁复合结构水下内爆防护效果：实验与仿真Implosion may occur when pressure-resistant structures operate in deep-sea environments, and relevant protective measures must be proposed urgently. In this study, we designed and manufactured a lightweight and pressure-resistant novel thin-walled composite structure and conducted experiments and simulations to evaluate its implosion protection effect. The experiment was conducted using a full-ocean-depth sea environment simulator. By comparing the shock waves and damaged structural fragments at the monitoring points, the flow field response characteristics and structural failure modes were an alyzed. Further, the effectiveness of the novel thin-walled composite structure in terms of implosion protection compared with traditional ceramic pressure-resistant floating spheres was intuitively revealed. Subsequently, simulation studies were conducted and found to be consistent with the experimental results, demonstrating the effectiveness of the numerical an alysis. Finally, the concepts of critical implosion protection pressure and critical differential pressure of implosion protection were proposed, and parametric studies were conducted to explore the effects of reducing the surrounding pressure or increasing the internal pressure on the implosion response and protective effect. The results indicated that when the surrounding pressure was reduced to the critical implosion protection pressure, the overall structure could avoid catastrophic collapse, the protection effect improved, and the structure was relatively safe. In addition, when the surrounding pressure was determined, critical differential pressure of implosion protection could be achieved by increasing the internal pressure of the hollow composite structure to enhance its implosion protection performance. These findings provide a reference for the design and implementation of deep-sea pressure-resistant shells.耐压结构物在深海环境中运行时可能发生内爆，迫切需要提出相应的防护措施。在本研究中，我们设计和制造了一种轻质耐压的新型薄壁复合材料结构，并对其内爆防护效果进行了实验和模拟评估。实验采用全海深海洋环境模拟器进行。通过对监测点处的激波和结构破片的对比，分析了结构的流场响应特征和破坏模式。此外，与传统的陶瓷耐压浮球相比，新型薄壁复合材料结构在防内爆方面的有效性也得到了直观的揭示。随后进行了仿真研究，结果与实验结果一致，证明了数值分析的有效性。最后，提出了临界内爆保护压力和内爆保护临界差压的概念，并进行了参数化研究，探讨了降低周围压力或增加内压对内爆响应和防护效果的影响。结果表明，当周围压力降低到临界内爆防护压力时，结构整体可以避免灾难性倒塌，防护效果提高，结构相对安全。另外，当周围压力确定时，通过提高中空复合材料结构的内压，可以达到内爆防护的临界压差，从而提高其内爆防护性能。研究结果可为深海耐压壳的设计与实现提供参考。来源：复合材料力学仿真Composites FEM