【新文速递】2023年11月23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 2 篇，Journal of the Mechanics and Physics of Solids 1 篇，Mechanics of Materials 1 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 1 篇

International Journal of Solids and Structures

Frictionless line-to-line contact: Comparison of mortar and unbiased formulation in combination with Lagrange-multiplier and penalty method

Tomec Jan, Jelenić Gordan

doi:10.1016/j.ijsolstr.2023.112586

无摩擦线对线接触：结合拉格朗日乘法器和惩罚法的砂浆和无偏公式比较

Recent developments in the beam-to-beam contact mechanics have prompted us to investigate further into the relations between different formulations and contact-force models. Specifically we address in this paper the recently developed mortar method for beams and develop its variant based on the penalty method. This allows an in-depth comparison between the two formulations. Furthermore, we design an unbiased approach and introduce a new discretisation technique developed specifically for this method. The unbiased line-to-line method is also combined both with the Lagrange-multiplier and the penalty method. All developed elements have been tested using the same examples to provide an objective comparison between formulations in terms of robustness and computational cost.

梁对梁接触力学的最新发展促使我们进一步研究不同公式和接触力模型之间的关系。具体而言，我们在本文中讨论了最近开发的梁灰泥法，并根据惩罚法开发了其变体。这样，我们就可以对两种公式进行深入比较。此外，我们还设计了一种无偏方法，并引入了专门为该方法开发的新离散化技术。无偏线对线方法还与拉格朗日乘法器和惩罚法相结合。我们使用相同的示例对所有开发的元素进行了测试，以便在鲁棒性和计算成本方面对各种公式进行客观比较。

Improved deep artificial neural network-powered prediction of extreme mechanical performances of fractal architectures with high hierarchical rank

Viet N.V., Ilyas S., Zaki W.

doi:10.1016/j.ijsolstr.2023.112591

由深度人工神经网络驱动的高分层等级分形结构极端力学性能的改进预测

This work explores the mechanical performances, including anisotropy, wave propagation, and buckling resistance capability of the Menger sponge and Jerusalem fractal structures, with the high rank, using an improved deep artificial neural network (ANN) model inserted by a loop with multiple conditions. Where, the effective mechanical attributes, including Young’s modulus, shear modulus, and Poisson’s ratio of the Menger sponge structure with rank 4 are attained using high-performance computer cluster (HPCC) that are then used to train and also validate the ANN model. The accuracy of the deep ANN model trained by data of fractal structures with and without rank 4 is verified by the numerical model and experiment with the good agreement found or the maximum percent difference being 15.6% where the numerical and experimental data don’t belong to its training samples. Remarkably, the deep ANN model demonstrates an extremely low cost, but very fast compared with the numerical and experimental works. Namely, the improved deep ANN model implemented by a regular computer can accurately predict the mechanical attributes of Menger sponge fractal structures with full ranks in 3 minutes. While it takes a week for numerical work using HPCC or experiment method to produce the same mechanical properties of the Menger sponge with only rank 4, displaying at least thousands of times slower than the ANN model. The ANN results indicate that the onset of anisotropy of considered fractal structures is from rank 1, and the reversal of anisotropy will take place upon an increase in the rank while such reversal is not seen for the case of lattice structure. The anisotropy reversal could be one of main reasons why the fractal structure tends to have a high rank in nature. In addition, the buckling stress and phase wave velocity are observed to decrease with rising rank, with a nonlinear pattern.

这项研究利用一个改进的深度人工神经网络（ANN）模型，通过一个具有多个条件的循环，探索了高阶门格尔海绵和耶路撒冷分形结构的力学性能，包括各向异性、波传播和抗屈曲能力。其中，利用高性能计算机集群（HPCC）获得了等级为 4 的门格尔海绵结构的有效力学属性，包括杨氏模量、剪切模量和泊松比，然后用于训练和验证 ANN 模型。通过数值模型和实验验证了由有无秩 4 的分形结构数据训练出的深度 ANN 模型的准确性，结果表明，在数值数据和实验数据不属于其训练样本的情况下，两者的一致性良好，最大百分比差异为 15.6%。值得注意的是，与数值和实验结果相比，深度 ANN 模型成本极低，但速度极快。也就是说，用普通计算机实现的改进型深度 ANN 模型可以在 3 分钟内准确预测门格尔海绵分形结构的全等级力学属性。而使用 HPCC 或实验方法进行数值计算需要一周时间才能得出只有 4 级的门格尔海绵的相同力学属性，比 ANN 模型至少慢数千倍。方差分析结果表明，所考虑的分形结构的各向异性是从阶 1 开始的，阶数增加时各向异性会发生逆转，而晶格结构则不会发生这种逆转。各向异性反转可能是分形结构倾向于具有高秩的主要原因之一。此外，还观察到屈曲应力和相位波速随着阶数的增加而减小，呈现非线性模式。

Journal of the Mechanics and Physics of Solids

Lessons learned from matching 3D DEM and experiments at macro, meso and fabric scales for triaxial compression tests on lentils

Pan Jin-hong, Pinzón Gustavo, Wang Rui, Andò Edward, Viggiani Gioacchino, Zhang Jian-Min

doi:10.1016/j.jmps.2023.105494

将三维 DEM 与小扁豆三轴压缩试验的宏观、中观和织物尺度试验相匹配，从中汲取经验教训

A series of discrete element method (DEM) triaxial compression simulations on specimens of an anisometric granular material starting from distinct initial fabric anisotropy states are conducted and compared with physical experiments on lentils at different scales, assisted by operando x-ray tomography measurements. A quantitative reproduction of the group of experimental results is achieved by appropriate idealization and determination of particle shape, boundary conditions, contact parameters, and initial state. The reliability of DEM in quantitative representation of macro scale stress–strain response, meso scale strain localization, and micro scale fabric anisotropy evolution is thus comprehensively validated against measurements from physical experiments, which is a step forward from comparisons only at the macro or particle kinematics level. Several key factors that govern realistic DEM simulations are also identified. The friction coefficient between particles during specimen generation, particle shape, and specimen preparation method can significantly affect the initial state of DEM specimens. Differences in initial state at macro and micro scales and boundary conditions can strongly influence the stress–strain response. However, the evolution of fabric anisotropy appears to be insensitive to changes in initial state and boundary conditions.

在 X 射线断层扫描测量的辅助下，对从不同的初始结构各向异性状态开始的异性颗粒材料试样进行了一系列离散元法（DEM）三轴压缩模拟，并与不同尺度的扁豆物理实验进行了比较。通过对颗粒形状、边界条件、接触参数和初始状态的适当理想化和确定，实现了一组实验结果的定量再现。因此，DEM 在定量表示宏观尺度应力应变响应、中观尺度应变定位和微观尺度织物各向异性演变方面的可靠性得到了物理实验测量结果的全面验证，这比仅在宏观或颗粒运动学层面进行比较向前迈进了一步。此外，还确定了影响真实 DEM 模拟的几个关键因素。试样生成过程中颗粒之间的摩擦系数、颗粒形状和试样制备方法都会对 DEM 试样的初始状态产生重大影响。宏观和微观尺度上初始状态的差异以及边界条件会对应力-应变响应产生重大影响。然而，织物各向异性的演变似乎对初始状态和边界条件的变化并不敏感。

Mechanics of Materials

Effect of temperature on adhesion behavior of layered piezoelectric structure

Luo Qing-Hui, Zhou Yue-Ting, Li Fengjun, Wang Lihua

doi:10.1016/j.mechmat.2023.104870

温度对层状压电结构粘附行为的影响

The effect of temperature on adhesion is neglected in classical adhesive contact theories. However, an increasing number of experimental results indicate that temperature has a prominent effect on adhesion behaviors. In this study, the anisothermal adhesive contact behaviors between two transversely isotropic piezoelectric cylinders with different initial temperatures is investigated by virtue of the generalized JKR model, where the contact interface is assumed to be perfectly bonded. The considered problem is reduced to coupled singular integral equations, which is derived by using the Fourier integral transform. The closed-form solutions of anisothermal generalized stress fields are obtained by taking the series expansion of the integrand induced by temperature difference. The effect of temperature difference on adhesion behaviors of two different types of layered piezoelectric structures under the action of mechanical-electro loadings is revealed. It is found that the pull-off force and contact size at pull-off moment decrease with increasing the temperature difference. The adhesion weakening effect induced by temperature difference diminishes when the electric loading is exerted. The results derived from this paper shed lights on understanding the adhesive contact behaviors of piezoelectric materials in the presence of temperature difference.

经典的粘合接触理论忽略了温度对粘合力的影响。然而，越来越多的实验结果表明，温度对粘附行为有显著影响。在本研究中，通过广义 JKR 模型研究了两个具有不同初始温度的横向各向同性压电圆柱体之间的等温粘附接触行为，其中假定接触界面是完全粘合的。所考虑的问题被简化为耦合奇异积分方程，并通过傅立叶积分变换得到。通过对温差引起的积分进行序列展开，得到了等温广义应力场的闭式解。揭示了温差对两种不同类型的层状压电结构在机械电子负载作用下的粘附行为的影响。研究发现，拉脱力和拉脱时刻的接触尺寸随温差的增大而减小。施加电加载时，温差引起的附着力减弱效应减弱。本文得出的结果有助于理解压电材料在温差作用下的粘附接触行为。

International Journal of Plasticity

A generalized, computationally versatile plasticity model framework - Part I: Theory and verification focusing on tension‒compression asymmetry

Hou Yong, Du Kai, Min Junying, Lee Hyung-Rim, Lou Yanshan, Park Namsu, Lee Myoung-Gyu

doi:10.1016/j.ijplas.2023.103818

通用的、可计算的塑性模型框架--第一部分：以拉伸-压缩不对称为重点的理论与验证

Microstructural characteristics and complex loading conditions in the deformation of metallic materials lead to complexity in mechanical responses. In this study, we propose a generalized constitutive framework that reproduces the plastic anisotropy and asymmetry under various loading conditions. Particularly, the developed model can accurately capture distinctive flow stress, plastic flow and strain hardening between tensile and compressive dominant loadings under a wide range of stress states. The model is based on the stress triaxiality dependence of state variable (or weighting factor) newly incorporated in the existing plasticity theory to keep the computational efficiency and versatility. For example, the new generalized framework can be applied to widely employed Hill48, Yld2k-2d, and Poly6 as a class of associated flow rule-based yield functions, as well as Stoughton-Yoon2009 and Min2016 yield functions for the non-associated flow rule. Also, the model is adaptable when selecting the yield function under tension or compression, which efficiently controls the degree of accuracy in anisotropic modeling under tension and compression. The generalized plasticity framework is validated comprehensively by demonstrating the predictive capability for anisotropy in yield stress and plastic flow of metallic materials with different crystal structures. Moreover, the model can efficiently capture the continuous evolution of asymmetric yield surfaces as functions of strain, temperature, and strain rate. Finally, the identification procedure of the model is discussed by demonstrating the analytical determination of model parameters utilizing the experimental or generic material data obtained from various loading conditions such as tension, compression, plane strain loading and pure shear.

金属材料变形过程中的微观结构特征和复杂的加载条件导致了机械响应的复杂性。在本研究中，我们提出了一种通用的构成框架，它能再现各种加载条件下的塑性各向异性和不对称。特别是，所开发的模型能在广泛的应力状态下准确捕捉拉伸和压缩主导载荷之间独特的流动应力、塑性流动和应变硬化。该模型基于现有塑性理论中新加入的状态变量（或权重因子）的应力三轴依赖性，以保持计算效率和通用性。例如，新的广义框架可应用于广泛采用的基于关联流动规则的 Hill48、Yld2k-2d 和 Poly6 屈服函数，以及非关联流动规则的 Stoughton-Yoon 2009 和 Min2016 屈服函数。此外，该模型在选择拉伸或压缩下的屈服函数时具有适应性，可有效控制拉伸和压缩下各向异性建模的精确度。通过展示不同晶体结构金属材料屈服应力和塑性流动各向异性的预测能力，全面验证了广义塑性框架。此外，该模型还能有效捕捉非对称屈服面作为应变、温度和应变率函数的连续演化。最后，通过演示利用从拉伸、压缩、平面应变加载和纯剪切等各种加载条件下获得的实验或通用材料数据分析确定模型参数的过程，讨论了模型的识别程序。

Thin-Walled Structures

Magneto-thermo-elastic Coupled Free Vibration and Nonlinear Frequency Analytical Solutions of FGM Cylindrical Shell

Hu Yuda, Zhou Qi, Yang Tao

doi:10.1016/j.tws.2023.111406

FGM 圆柱壳的磁热弹耦合自由振动和非线性频率解析解

The magneto-thermo-elastic coupled free vibration of functionally graded materials (FGM) cylindrical shell is investigated. Based on the physical neutral surface theory and Kirchhoff-Love theory, the expressions of internal force and internal torque are obtained by considering the constitutive relationship that includes thermal stress. According to the electromagnetic elasticity theory, the model of Lorentz forces of the shell in magnetic field are derived. The expressions of potential energy, kinetic energy and its variational operators are given by introducing geometric nonlinearity, respectively. Based on Hamilton principle, the magneto-thermal-elastic coupled vibration equation of FGM cylindrical shell in multi-physical field is established. The displacement functions under simply supported boundary conditions are solved, which are combined with Galerkin method for derivation of nonlinear ordinary differential equations. The second-order approximate analytical solution of natural frequency is obtained by applying the multi-scale method. The characteristic curves of natural frequency with different parameters are drawn through numerical examples. The results show that reducing the volume fraction index and increasing the initial amplitude can lead to the increase of the natural frequency under transient conditions. With the increase of temperature and magnetic induction intensity, the natural frequency decreases. In addition, the natural frequency is also influenced by the shell size and volume fraction index.

研究了功能分级材料（FGM）圆柱形壳体的磁热弹性耦合自由振动。基于物理中性面理论和基尔霍夫-洛夫理论，通过考虑包含热应力的构成关系，得到了内力和内扭矩的表达式。根据电磁弹性理论，推导出了磁场中壳体的洛伦兹力模型。通过引入几何非线性，分别给出了势能、动能及其变分算子的表达式。基于汉密尔顿原理，建立了 FGM 圆柱壳在多物理场中的磁-热-弹性耦合振动方程。求解了简单支撑边界条件下的位移函数，并结合 Galerkin 方法推导出非线性常微分方程。应用多尺度法得到了固有频率的二阶近似解析解。通过数值实例绘制了不同参数下的固有频率特征曲线。结果表明，在瞬态条件下，减小体积分数指数和增大初始振幅可导致固有频率的增加。随着温度和磁感应强度的增加，固有频率降低。此外，固有频率还受到壳体尺寸和体积分数指数的影响。

来源：复合材料力学仿真Composites FEM

【新文速递】2023年11月25日复合材料SCI期刊最新文章

今日更新：Composite Structures 3 篇，Composites Part A: Applied Science and Manufacturing 2 篇Composite StructuresFlexural behavior evaluation of a foam core curved sandwich beamHonglei Xie, Wanjin Li, Hai Fang, Shijiang Zhang, Zhixin Yang, Yuan Fang, Feng Yudoi:10.1016/j.compstruct.2023.117729泡沫芯材弯曲夹层梁的挠曲行为评估In this study, curved sandwich beams (CSBs) with glass fiber-reinforced polymer (GFRP) and polyethylene terephthalate (PET) foam core were initially fabricated. Experiments in three-point bending were then performed to understand the flexural behaviors including failure modes, load-bearing capacities, and load-displacement curves. The effects of various geometrical parameters including facesheets and core thicknesses, two different types of cores, and curvature radius were clarified. It was found that the utilization of PET foam in CSBs resulted in a prevention of core shearing failure and a gradual decrease in load-displacement response. Moreover, the results showed that the ultimate load-bearing capacity and stiffness of the CSBs decreased by 17.7% and 61.8%, with a curvature decreased from 1500 to 300 mm, respectively. An analytical model was performed to accurately estimate the experimental failure modes and load-bearing capacities of CSBs. Failure maps were also developed to investigate the various failure modes caused by different geometric parameters of curved sandwich beams. The failure maps offer valuable guidance for the design of lightweight structures.在这项研究中，首先制作了采用玻璃纤维增强聚合物（GFRP）和聚对苯二甲酸乙二酯（PET）泡沫芯材的曲面夹层梁（CSB）。然后进行了三点弯曲实验，以了解其弯曲行为，包括破坏模式、承载能力和载荷-位移曲线。实验明确了各种几何参数的影响，包括面片和芯材厚度、两种不同类型的芯材以及曲率半径。研究发现，在 CSB 中使用 PET 泡沫可防止芯材剪切失效，并逐渐降低荷载-位移响应。此外，研究结果表明，当曲率从 1500 毫米减小到 300 毫米时，CSB 的极限承载能力和刚度分别降低了 17.7% 和 61.8%。为准确估算 CSB 的实验失效模式和承载能力，我们建立了一个分析模型。此外，还绘制了失效图，以研究不同几何参数对弯曲夹层梁造成的各种失效模式。失效图为轻质结构的设计提供了宝贵的指导。Boundary Discontinuous Fourier analysis of clamped isotropic and cross-ply laminated plates via Unified FormulationRW Laureano, JL Mantari, J Yarasca, AS Oktem, J Monge, Xueqian Zhoudoi:10.1016/j.compstruct.2023.117736通过统一公式对夹紧的各向同性和交叉层压板进行边界非连续傅里叶分析This paper presents an analytical solution for the static analysis of plates with clamped boundary conditions prescribed at the edges. The displacement field is expressed via the Carrera Unified Formulation (CUF) where an Equivalent-Single-Layer (ESL) approach is adopted. The governing equations are obtained by employing the principle of virtual displacements (PVD) statement. The main novelty is the use of the boundary-discontinuous Fourier-based approach to provide accurate numerical solutions. From thick to thin isotropic, cross-ply laminated and sandwich plates with different side-to-thickness ratios and stacking sequences are studied. Furthermore, the out-of-plane stresses are calculated via both the constitutive relation and the stress recovery technique. The accuracy of the proposed solution is verified by comparing the numerical results obtained with those from the literature and 3D FEM solutions. The present approach seems capable of handling not just fully clamped conditions but also mixed external conditions, which may include clamped and simply-supported edges. The solution approach provided in this article is unique, hence the proposed results might be useful as a benchmark for validating new plate theories and finite elements.本文提出了一种分析方法，用于对边缘规定了夹紧边界条件的板材进行静态分析。位移场通过卡雷拉统一公式（CUF）表示，其中采用了等效单层（ESL）方法。通过采用虚拟位移原理 (PVD) 声明，获得了控制方程。主要的新颖之处在于使用基于边界的非连续傅立叶方法来提供精确的数值解。研究了从厚到薄的各向同性、交叉层压板和夹层板，以及不同的侧厚比和堆叠顺序。此外，平面外应力是通过构成关系和应力恢复技术计算得出的。通过将所获得的数值结果与文献和三维有限元求解结果进行比较，验证了所提出解决方案的准确性。本方法似乎不仅能处理完全夹紧条件，还能处理混合外部条件，其中可能包括夹紧和简支撑边缘。本文提供的求解方法是独一无二的，因此提出的结果可以作为验证新板材理论和有限元的基准。Multiscale topology optimization of gradient lattice structure based on volume parametric modelingLong Chen, Junjun Che, Shuxun Liang, Yingjun Wangdoi:10.1016/j.compstruct.2023.117746基于体积参数建模的梯度晶格结构多尺度拓扑优化In this study, a volume parametric modeling method of lattice structure is proposed, and an efficient multiscale topology optimization framework is realized based on isogeometric analysis (IGA) to construct the gradient lattice structure. The skeleton model is constructed, which can accurately describe the topology structure and improve data utilization and computational efficiency. Based on the skeleton model, a uniform volume parameter lattice structure with an arbitrary topology of multiple types of unit cells is constructed, which is suitable for IGA. Moreover, multiscale topology optimization based on IGA is realized to construct the gradient lattice structure. The same data model is used in modeling, analysis, and optimization, which can accurately represent the geometric shape without discretization errors. At the same time, the multiscale topology optimization iteration is realized by adjusting the density of control points. The optimized model can be directly analyzed and re-optimized, thus realizing the integrated design of lattice structure modeling, simulation, and optimization. The effectiveness and robustness of the algorithm are verified by several mechanical parts and freeform models. These examples show that the gradient lattice structure has higher strength and better stress distribution than the uniform lattice structure under the same boundary conditions.本研究提出了网格结构的体积参数化建模方法，并基于等几何分析（IGA）实现了高效的多尺度拓扑优化框架，构建了梯度网格结构。构建的骨架模型可以精确描述拓扑结构，提高数据利用率和计算效率。在骨架模型的基础上，构建了具有多种类型单元格的任意拓扑的均匀体积参数晶格结构，适用于 IGA。此外，还实现了基于 IGA 的多尺度拓扑优化，以构建梯度晶格结构。在建模、分析和优化过程中使用了相同的数据模型，可以准确地表示几何形状，而不会产生离散化误差。同时，通过调整控制点密度实现多尺度拓扑优化迭代。优化后的模型可直接进行分析和再优化，从而实现晶格结构建模、仿真和优化的一体化设计。该算法的有效性和鲁棒性通过几个机械零件和自由曲面模型得到了验证。这些实例表明，在相同的边界条件下，梯度晶格结构比均匀晶格结构具有更高的强度和更好的应力分布。Composites Part A: Applied Science and ManufacturingEnhanced thermal conductivity of phase change composites with novel binary graphite networksBiao Cheng, Huafeng Quan, Yuefeng Zhang, Dong Huang, Tongqi Li, Chong Ye, Xingming Zhou, Zhen Fan, Yafang Zhang, Ting Ouyang, Fei Han, Hongbo Liu, Jinshui Liudoi:10.1016/j.compositesa.2023.107925利用新型二元石墨网络增强相变复合材料的导热性能The thermal conductivity and porous structure of carbon-based networks significantly affect the heat exchange efficiency in phase change composites. However, simultaneously improving its thermal conductivity and controlling the formation of micrometer-scale open pores remains a significant challenge. In this study, a binary graphite network is constructed by both high-thermal-conductivity mesophase-pitch carbon fibers and high-textured pyrolysis carbon through chemical vapor deposition and ultra-high temperature graphitization, then embed paraffin to form high-performance phase change composites. The characteristic hierarchical pore structure in the binary graphite network facilitating the paraffin impregnation and its heat exchange efficiency is greatly improved by showing an optimum thermal conductivity of 144.78 W·m-1·K-1 and a phase change enthalpy of 87.4 J·g-1 at 0.6 g·cm-3 graphite skeleton and 51 wt.% paraffin. The developed phase change composites hold great application potential in thermal control for space optical-mechanical systems and other critical aerospace components.碳基网络的导热性和多孔结构会对相变复合材料的热交换效率产生重大影响。然而，如何同时提高其热导率和控制微米级开放孔隙的形成仍是一项重大挑战。在本研究中，通过化学气相沉积和超高温石墨化技术，利用高导热介相间距碳纤维和高纹理热解碳构建了二元石墨网络，然后嵌入石蜡形成高性能相变复合材料。在 0.6 g-cm-3 的石墨骨架和 51 wt.% 的石蜡条件下，二元石墨网络中特有的分层孔隙结构有利于石蜡的浸渍，其热交换效率大大提高，最佳热导率为 144.78 W-m-1-K-1，相变焓为 87.4 J-g-1。所开发的相变复合材料在太空光学机械系统和其他关键航空航天部件的热控制方面具有巨大的应用潜力。Insight into crack propagation induced by fiber orientations during single grain scratching of SiCf/SiC composites using FEMYichuan Ran, Renke Kang, Jiansong Sun, Zhigang Dong, Hao Wang, Yan Baodoi:10.1016/j.compositesa.2023.107928 利用有限元分析深入了解 SiCf/SiC 复合材料单晶划痕过程中纤维取向诱发的裂纹扩展Due to the multiphase structure and anisotropy of ceramic matrix composites (CMCs), crack propagation is extremely complex during grinding. However, there is no full comprehension of the crack propagation law of CMCs in varying fiber directions, which limits high-quality CMCs machining. Based on experimental and numerical results, the effect of fiber directions on crack propagation of SiCf/SiC composites was analyzed. Results demonstrate that the change in crack propagation path is the primary reason why the removal behavior of CMCs is different from traditional ceramics. For CMCs, the interface is the priority path of crack propagation no matter along any fiber direction. Besides, the fiber orientation determines the propagation paths of radial and subsurface cracks, which affects material removal behavior. Comparing the scratched groove, the groove edge damage is the most severe when scratching along the fiber transverse direction, whereas the scratched groove surface quality is best in the perpendicular direction.由于陶瓷基复合材料（CMC）的多相结构和各向异性，磨削过程中的裂纹扩展极为复杂。然而，人们对 CMC 在不同纤维方向上的裂纹扩展规律尚不完全了解，从而限制了 CMC 的高质量加工。基于实验和数值结果，分析了纤维方向对 SiCf/SiC 复合材料裂纹扩展的影响。结果表明，裂纹传播路径的变化是 CMCs 的去除行为不同于传统陶瓷的主要原因。对于 CMC 而言，无论沿着哪个纤维方向，界面都是裂纹传播的优先路径。此外，纤维取向决定了径向和表层下裂纹的传播路径，从而影响材料的去除行为。比较划痕沟槽，沿纤维横向划痕时沟槽边缘损伤最严重，而垂直方向划痕时沟槽表面质量最好。来源：复合材料力学仿真Composites FEM