【新文速递】2023年11月25日复合材料SCI期刊最新文章

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今日更新：Composite Structures 3 篇，Composites Part A: Applied Science and Manufacturing 2 篇

Composite Structures

Flexural behavior evaluation of a foam core curved sandwich beam

Honglei Xie, Wanjin Li, Hai Fang, Shijiang Zhang, Zhixin Yang, Yuan Fang, Feng Yu

doi: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 Formulation

RW Laureano, JL Mantari, J Yarasca, AS Oktem, J Monge, Xueqian Zhou

doi: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 modeling

Long Chen, Junjun Che, Shuxun Liang, Yingjun Wang

doi: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 Manufacturing

Enhanced thermal conductivity of phase change composites with novel binary graphite networks

Biao Cheng, Huafeng Quan, Yuefeng Zhang, Dong Huang, Tongqi Li, Chong Ye, Xingming Zhou, Zhen Fan, Yafang Zhang, Ting Ouyang, Fei Han, Hongbo Liu, Jinshui Liu

doi: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 FEM

Yichuan Ran, Renke Kang, Jiansong Sun, Zhigang Dong, Hao Wang, Yan Bao

doi: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

【新文速递】2023年11月16日固体力学SCI期刊最新文章

今日更新：International Journal of Solids and Structures 1 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 1 篇International Journal of Solids and StructuresCracks in tensile-contracting and tensile-dilating poroelastic materialsGaryfallogiannis Konstantinos, Purohit Prashant K., Bassani John L.doi:10.1016/j.ijsolstr.2023.112563拉伸收缩和拉伸膨胀孔弹性材料中的裂纹Fibrous gels such as cartilage, blood clots, and carbon-nanotube-based sponges with absorbed oils suffer a reduction in volume by the expulsion of liquid under uniaxial tension, and this directly affects crack-tip fields and energy release rates. A continuum model is formulated for isotropic fibrous gels that exhibit a range of behaviors from volume increasing to volume decreasing in uniaxial tension by changing the ratio of two material parameters. The motion of liquid in the pores of such gels is modeled using poroelasticity. The direction of liquid fluxes around cracks is shown to depend on whether the gel locally increases or decreases in volume. The energy release rate for cracks is computed using a surface-independent integral and it is shown to have two contributions - one from the stresses in the solid network, and another from the flow of liquid. The contribution to the integral from liquid permeation tends to be negative when the gel exhibits volume decrease, which effectively is a crack shielding mechanism.纤维凝胶，如软骨、血凝块和碳纳米管海绵，在单轴拉伸下，由于液体的排出，其体积会减少，这直接影响到裂纹尖端的场和能量释放率。对于各向同性纤维凝胶，通过改变两种材料参数的比例，在单轴拉伸下表现出从体积增加到体积减少的一系列行为，建立了连续介质模型。液体在这种凝胶的孔隙中的运动是用孔隙弹性来模拟的。裂缝周围液体通量的方向取决于凝胶的局部体积是增加还是减少。裂缝的能量释放率是用与表面无关的积分来计算的，它有两个贡献——一个来自固体网络中的应力，另一个来自液体的流动。当凝胶体积减小时，液体渗透对积分的贡献趋于负，这是一种有效的裂缝屏蔽机制。International Journal of PlasticityStrain delocalization in a gradient-structured high entropy alloy under uniaxial tensile loadingFu Wujing, Sun Yonggang, Fan Guohua, Huang Yongjiang, Ning Zhiliang, Li Xuewen, Wang Keyan, Sun Jianfei, Jiang Shandoi:10.1016/j.ijplas.2023.103808梯度结构高熵合金在单轴拉伸载荷下的应变离域Suppressing strain localization in hard layers was crucial for making gradient alloys ductile. Here, a typical structure in CrFeCoNiMn0.75Cu0.25 high entropy alloy (HEA), which combines gradient distributions along the depth for grain width and twin density, was fabricated using the laser shock peening treatment. In situ digital image correlation methods elucidated the mechanisms of the excellent mechanical properties in HEAs treated by LSP for 4 cycles from the perspective of local strain. Dense shear bands were nucleated at the low-strain stage, and remained stable evolution during the entire plastic deformation, thus, leading to an excellent tensile ductility (∼40%). The plastic deformation incompatibility results in two-dimensional stress states and lateral strain gradient near the plastic-elastic interfaces, which stimulates the interaction and accumulation of micro-defects, thus, improving the strain hardening capacity of alloys. These observations will reveal the mechanistic origin of the gradient structured alloys with superior strength-ductility from a new perspective, which also provide a guidance for optimized mechanical performances of HEAs.抑制硬层应变局部化是提高梯度合金延展性的关键。采用激光冲击强化处理，制备了CrFeCoNiMn0.75Cu0.25高熵合金(HEA)中晶粒宽度和孪晶密度沿深度梯度分布的典型组织。原位数字图像相关方法从局部应变的角度阐明了4次LSP处理后HEAs优异力学性能的机理。密集的剪切带在低应变阶段成核，并在整个塑性变形过程中保持稳定演变，从而导致优异的拉伸延展性(约40%)。塑性变形不相容导致在弹塑性界面附近产生二维应力状态和侧向应变梯度，刺激微缺陷的相互作用和积累，从而提高合金的应变硬化能力。这些观察结果将从新的角度揭示具有优异强度-延展性的梯度结构合金的机理根源，并为优化HEAs的力学性能提供指导。Thin-Walled StructuresNonlinear Vibrations of FG-GRLCC Rectangular Variable Cross-Section Plate Subjected to Transverse and Parametric Excitations in Thermal EnvironmentJiang Y., Zhang W., Zhang Y.F.doi:10.1016/j.tws.2023.111354热环境下FG-GRLCC变截面矩形板在横向和参数激励下的非线性振动This paper investigates the linear and nonlinear vibration responses for the functionally graded graphene-reinforced laminated composite cantilever (FG-GRLCC) rectangular variable cross-section plate subjected to the transverse and parametric excitations under the thermal environment. Halpin-Tsai model is used to calculate the material properties of the graphene-reinforced structure. Using the classical laminated plate theory, von Karman large deformation theory, Hamilton principle and Galerkin method, the dynamic model is given for the FG-GRLCC rectangular variable cross-section plate. The natural frequencies and mode shapes are analyzed for the FG-GRLCC rectangular variable cross-section plate under the thermal environment through using Rayleigh-Ritz method. The averaged equations of the system are obtained based on the multiple scale perturbation (MSP) under the primary, 1/2 sub-harmonic and 1:1 internal resonances. The comparisons between the theoretical algorithm and finite element method are proposed to illustrate the accuracy of the present model. The results about the frequency veering phenomenon and mode shape interaction have been illustrated. The amplitude-frequency response curves and force-amplitude response curves are depicted for the FG-GRLCC rectangular variable cross-section plate. The nonlinear and chaotic vibrations for the FG-GRLCC rectangular variable cross-section plate is studied by using the bifurcation diagrams and max Lyapunov exponents.研究了热环境下梯度石墨烯增强层合复合材料悬臂梁(FG-GRLCC)变截面矩形板在横向和参数激励下的线性和非线性振动响应。采用Halpin-Tsai模型计算石墨烯增强结构的材料性能。利用经典叠合板理论、von Karman大变形理论、Hamilton原理和Galerkin方法，建立了FG-GRLCC变截面矩形板的动力学模型。采用瑞利-里兹法分析了FG-GRLCC变截面矩形板在热环境下的固有频率和振型。在主谐振、1/2次谐振和1:1内谐振的情况下，得到了系统的平均方程。将理论算法与有限元法进行了比较，说明了模型的准确性。给出了频率转向现象和模态振型相互作用的研究结果。给出了FG-GRLCC矩形变截面板的幅频响应曲线和力幅响应曲线。利用分岔图和最大李雅普诺夫指数研究了FG-GRLCC矩形变截面板的非线性和混沌振动。来源：复合材料力学仿真Composites FEM