【新文速递】2024年2月16日固体力学SCI期刊最新文章

13小时前浏览32

今日更新：International Journal of Solids and Structures 1 篇，Mechanics of Materials 1 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 3 篇

International Journal of Solids and Structures

Efficient computational homogenisation of 2D beams of heterogeneous elasticity using the patch scheme

Thien Tran-Duc, J.E. Bunder, A.J. Roberts

doi:10.1016/j.ijsolstr.2024.112719

使用补丁方案对异质弹性二维梁进行高效计算均质化

Modern ‘smart’ materials have complex heterogeneous microscale structure, often with unknown macroscale closure but one we need to realise for large scale engineering and science. The multiscale Equation-Free Patch Scheme empowers us to non-intrusively, efficiently, and accurately predict large scale, system level, solutions through computations on only small sparse patches of the given detailed microscale system. Here the microscale system is that of a 2D beam of heterogeneous elasticity, with either fixed-fixed, fixed-free, or periodic boundary conditions. We demonstrate that the described multiscale Patch Scheme simply, efficiently, and stably predicts the beam’s macroscale, with a controllable accuracy, at finite scale separation. Dynamical systems theory supports the scheme. This article points the way for others to use this innovative systematic non-intrusive approach, via a developing toolbox of functions, to model and compute accurately macroscale system-levels of general complex physical and engineering systems.

现代 "智能 "材料具有复杂的异质微观结构，通常具有未知的宏观封闭性，但我们需要实现大规模的工程和科学。多尺度无方程补丁方案使我们能够通过对给定详细微尺度系统的稀疏小补丁进行计算，非侵入式地高效、准确地预测大尺度系统级解决方案。这里的微尺度系统是具有固定-固定、无固定或周期性边界条件的异质弹性二维梁。我们证明，所描述的多尺度补丁方案可以简单、高效、稳定地预测梁的宏观尺度，并且在有限尺度分离的情况下精度可控。动力系统理论为该方案提供了支持。这篇文章为其他人使用这种创新的系统化非侵入式方法指明了方向，即通过一个开发中的函数工具箱，对一般复杂物理和工程系统的宏观系统级进行建模和精确计算。

Mechanics of Materials

Tailoring electromagnetic interference shielding effectiveness of SiO2-decorated MWCNT/polymer nanocomposites

Xiaodong Xia, Yang Liu, Juanjuan Zhang, Jianyang Luo, George J. Weng

doi:10.1016/j.mechmat.2024.104949

定制二氧化硅装饰的 MWCNT/聚合物纳米复合材料的电磁干扰屏蔽效果

While the decorated process has been demonstrated to be a highly efficient method to tailor the electrical conductivity of multi-walled carbon nanotube (MWCNT)-based nanocomposites, the corresponding influences on the agglomeration and electromagnetic interference (EMI) shielding behaviors still remain unknown. In this paper, the decoration-dependent EMI shielding behavior of progressively agglomerated SiO2@MWCNT/polymer nanocomposites is investigated through a hierarchical homogenization scheme of electromagnetic properties in the X-band. Various microstructural features including the MWCNT waviness, progressive agglomeration, hollow structure of MWCNT and decoration-dependent functional interfacial effects have been fully considered. The multiscale theoretical prediction of decorated EMI shielding effectiveness (SE) of progressively agglomerated SiO2@MWCNT/polymer nanocomposites agrees with the experiments along a wide range of decoration thickness. The SiO2 decorated interphase is demonstrated to tune both the nonuniform distribution of MWCNTs and the functional interface effects in the nanocomposites, and therefore tailor the decoration-dependent EMI shielding performance. The effective EMI SE is revealed to first enhance with the decoration thickness, but then decreases with it. The optimal decoration thickness for high EMI SE is obtained numerically. This research provides a guidance to tailor the X-band EMI shielding performance of progressively agglomerated SiO2@MWCNT/polymer nanocomposites by the decoration process.

虽然装饰工艺已被证明是一种定制多壁碳纳米管（MWCNT）基纳米复合材料导电性的高效方法，但其对团聚和电磁干扰（EMI）屏蔽行为的相应影响仍然未知。本文通过 X 波段电磁特性的分层均质化方案，研究了逐渐团聚的 SiO2@MWCNT/聚合物纳米复合材料与装饰相关的电磁干扰屏蔽行为。充分考虑了各种微观结构特征，包括 MWCNT 的波浪状、渐进团聚、MWCNT 的中空结构以及与装饰相关的功能界面效应。对渐进团聚的 SiO2@MWCNT/ 聚合物纳米复合材料的装饰电磁干扰屏蔽效能（SE）进行的多尺度理论预测与实验结果在较宽的装饰厚度范围内相吻合。事实证明，SiO2 装饰的中间相可以调整纳米复合材料中 MWCNT 的不均匀分布和功能界面效应，从而定制与装饰相关的 EMI 屏蔽性能。结果表明，有效的 EMI SE 首先会随着装饰厚度的增加而增加，但随后会随着装饰厚度的增加而减少。通过数值计算得到了实现高 EMI SE 的最佳装饰厚度。这项研究为通过装饰工艺定制逐步团聚的 SiO2@MWCNT/ 聚合物纳米复合材料的 X 波段 EMI 屏蔽性能提供了指导。

International Journal of Plasticity

A forming limit framework accounting for various failure mechanisms: localization, ductile and cleavage fracture

Fuhui Shen, Yannik Sparrer, Jing Rao, Markus Könemann, Sebastian Münstermann, Junhe Lian

doi:10.1016/j.ijplas.2024.103921

考虑到各种破坏机制的成形极限框架：局部破坏、韧性破坏和劈裂破坏

The forming limits and failure properties of three distinct advanced high-strength steels (AHSS) have been investigated under various stress states in tensile tests with optimized specimen geometries. In addition to the commonly observed failure patterns governed by localized necking and ductile fracture for two of the AHSS, after substantial plastic deformation at room temperature, cleavage fracture occurs for a large range of stress states in a laboratory quenching and partitioning steel with superior tensile properties. The competition between failure patterns, encompassing ductile and cleavage fractures with and without necking, is governed by the mechanical properties of materials and the stress states, as a transition of failure mechanisms occurs with increasing triaxiality. The forming limit framework is, therefore, further extended to seamlessly integrate cleavage fracture in this study, where the competition between various failure mechanisms is demonstrated using three AHSS in the space of critical strain and principal stress. These findings shed light on the importance of considering cleavage fracture strength as a parameter besides the strength-ductility synergy in advanced high-strength metallic materials, and the proposed framework also gives a more comprehensive guide in designing and conducting the sheet metal forming processes.

在采用优化试样几何形状的拉伸试验中，研究了三种不同的高级高强度钢（AHSS）在各种应力状态下的成型极限和破坏特性。除了两种 AHSS 常见的局部缩颈和韧性断裂失效模式外，一种具有优异拉伸性能的实验室淬火分区钢在室温下发生大量塑性变形后，在很大的应力状态范围内出现了劈裂断裂。材料的机械性能和应力状态决定了破坏模式之间的竞争，包括韧性断裂和劈裂断裂（有无缩颈），因为随着三轴度的增加，破坏机制会发生转变。因此，本研究进一步扩展了成形极限框架，以无缝整合劈裂断裂，并使用临界应变和主应力空间中的三种 AHSS 证明了各种破坏机制之间的竞争。这些发现揭示了在先进高强度金属材料中将劈裂断裂强度作为强度-电导率协同作用之外的一个参数考虑的重要性，所提出的框架也为设计和实施金属板材成形工艺提供了更全面的指导。

Thin-Walled Structures

Upper-bound Vibration Response Spectrum Computation for Deployable Membrane Structures with Uncertainty Effects

Takashi Iwasa, Shuuta Fujibayashi, Nobuhisa Katsumata, Ken Higuchi

doi:10.1016/j.tws.2024.111706

具有不确定性效应的可部署膜结构的上界振动响应谱计算

Real-time monitoring technology is essential for establishing a control technology for large-sized membrane space structures. However, numerous measurement points are necessary to capture the maximum vibration response, which renders the real-time monitoring technology impractical. Thus, this study proposed an upper-bound vibration spectrum computation approach using a few measurement points samples on a deployable membrane structure. The proposed method exhibits characteristics of applying the standardized upper-bound spectrum, including uncertainty effects for the computations. The experiment results indicated that the upper-bound spectrum calculated from only 30 measured data points appropriately covered the measured spectra, thus confirming the effectiveness of the proposed method.

实时监测技术对于建立大型膜空间结构的控制技术至关重要。然而，要捕捉最大振动响应，必须要有大量的测量点，这使得实时监测技术变得不切实际。因此，本研究提出了一种利用可展开膜结构上的少量测量点样本进行上限振动频谱计算的方法。所提出的方法具有应用标准化上界频谱的特点，包括计算的不确定性影响。实验结果表明，仅用 30 个测量数据点计算出的上限值频谱恰当地覆盖了测量频谱，从而证实了所提方法的有效性。

Influence of Diverse Boundary Conditions on SH and P-SV Wave Dynamics in Micropolar Plates

Satish Kumar, Vikas Sharma

doi:10.1016/j.tws.2024.111708

不同边界条件对微极性板块中 SH 波和 P-SV 波动力学的影响

Studying wave propagation characteristics in plates is vital for comprehending the material dynamics to enhance the strength of structures and for optimizing the effectiveness of non-destructive testing devices. Micropolar elasticity displays microcontinuum behavior by integrating rotational and coupling effects through displacements and micro-rotations. The present study thoroughly investigates horizontally polarized shear waves (SH) within a thin micropolar plate by employing diverse boundary conditions namely stress-free, clamped, and mixed conditions. Shear horizontal waves propagate within a plate by shearing the material along the surface, excluding any motion in perpendicular direction. Moreover, for a more comprehensive grasp of wave behavior in a micropolar plate, the study investigates P-SV type waves under plain strain conditions. Analytical techniques are utilized to derive the dispersion relations for SH and P-SV type waves in a micropolar plate. Graphical representations are provided to showcase the impacts of various micropolar parameters such as coupling number, characteristic length, and plate thickness on the phase velocities of SH and P-SV type waves. The study also includes a dispersion analysis of the multimode aspect of SH and P-SV waves. This thorough investigation can significantly augment the comprehension of wave propagation phenomena within plate-like structures.

研究板材中的波传播特性对于理解材料动力学以提高结构强度和优化无损检测设备的有效性至关重要。微极性弹性通过位移和微旋转整合了旋转和耦合效应，从而显示出微连续行为。本研究通过采用不同的边界条件，即无应力、夹紧和混合条件，深入研究了薄微波板内的水平极化剪切波（SH）。剪切水平波是通过沿表面剪切材料而在板内传播的，不包括任何垂直方向的运动。此外，为了更全面地掌握微极板中的波行为，研究还探讨了平应变条件下的 P-SV 型波。研究利用分析技术推导出微极板中 SH 波和 P-SV 波的频散关系。研究用图表展示了各种微波参数（如耦合数、特征长度和板厚度）对 SH 波和 P-SV 波相速的影响。研究还包括 SH 波和 P-SV 波多模方面的频散分析。这一深入研究可极大地增强对板状结构内波传播现象的理解。

A multistable composite hinge structure

Chenmin Zhao, Xinyu Lin, Bing Wang, Juncheng Zhu, Chenglong Guan, Shuncong Zhong

doi:10.1016/j.tws.2024.111709

多稳复合铰链结构

A composite tape-spring (CTS) structure is a thin-walled open slit tube with fibres oriented at ±45°, which is stable in both extended and coiled configurations. The governing factors of its bistability include composite constitutive behaviour, initial geometrical proportions, and geometrically non-linear structural behaviour. Its bistable principle can be employed to produce a flexible multistable hinge structure with tailorable stability. This is achieved by introducing variable stiffness design within a cylindrical shell structure, where folding stability is dependent on central functional patch region, and then connected to linking ploy regions. Thus, a novel multistable composite hinge structure can be designed with positive Gaussian curvature deformation, and its multistability is highly tailorable: a lengthy one-dimensional mechanical arm can be designed to coil and fold multiple times to enable large folding ratio. An analytical model was established based on the strain energy principle, in order to determine effects from functional tape length; the typical structural stability and stable configurations were then predicted with respect to regional length of the functional layer. It is found that the stability of a multistable composite hinge structure is dependent on geometry and combination of both the functional patch region, and connecting ploy region; the stable criteria are then proposed and show good agreement with experimental observations and FE analysis. These enrich the diversities of functional deployable structures to benefit novel requirements for various deployable mechanisms, and enable customised design, as well as smart driving for flexible and multifunctional mechanical composite hinge applications.

复合胶带弹簧（CTS）结构是一种纤维方向为±45°的薄壁开缝管，在伸展和盘绕两种配置下都很稳定。其双稳态性的制约因素包括复合材料的构成行为、初始几何比例和几何非线性结构行为。其双稳态原理可用于制造具有可定制稳定性的柔性多稳态铰链结构。这是通过在圆柱形壳体结构中引入可变刚度设计来实现的，其中折叠稳定性取决于中心功能补丁区域，然后连接到连接犁区域。因此，可以设计出一种具有正高斯曲率变形的新型多稳态复合铰链结构，而且其多稳态性具有很强的可定制性：可以设计出一个冗长的一维机械臂，使其可以多次卷绕和折叠，从而实现较大的折叠率。根据应变能原理建立了一个分析模型，以确定功能带长度的影响；然后预测了与功能层区域长度有关的典型结构稳定性和稳定构型。研究发现，多稳态复合铰链结构的稳定性取决于功能贴片区域和连接杆区域的几何形状和组合；随后提出了稳定标准，并与实验观察和 FE 分析结果表明了良好的一致性。这些研究丰富了功能性可展开结构的多样性，从而满足了各种可展开机构的新要求，实现了定制化设计以及灵活和多功能机械复合材料铰链应用的智能驱动。

来源：复合材料力学仿真Composites FEM

【新文速递】2024年2月1日复合材料SCI期刊最新文章

今日更新：Composites Part A: Applied Science and Manufacturing 2 篇，Composites Part B: Engineering 1 篇，Composites Science and Technology 1 篇Composites Part A: Applied Science and ManufacturingA critical plane approach for multiaxial fatigue life prediction of short fiber reinforced thermoplastic compositesMohammad Amjadi, Ali Fatemidoi:10.1016/j.compositesa.2024.108050短纤维增强热塑性复合材料多轴疲劳寿命预测的临界面方法The usage of short fiber reinforced thermoplastics has been increasing in many industries recently. These composites have many advantages such as high specific strength, lightweight, wear and rust resistance, high stiffness, fast processing rate, and relatively low manufacturing cost. Multiaxial cyclic loading and non-proportionality between different loading sources are inevitable in many applications with such materials. In this study, the multiaxial fatigue behavior of short glass fiber reinforced thermoplastics under different environmental and loading conditions is modeled using a critical plane-based damage approach. This model was recently used for uniaxial fatigue life prediction of Short Fiber Reinforced Thermoplastic Composites. In this paper the model is applied to a large amount of experimental multiaxial fatigue data, demonstrating significantly better correlations than other models used in the literature. The effects of fiber orientation, stress state, mean stress, and stress concentration on multiaxial fatigue behavior are considered in the model. Temperature and frequency effects on multiaxial fatigue behavior were also included by applying the proposed damage model into a general fatigue model. Model predictions are presented and discussed by comparing them with experimental data from the literature.近来，短纤维增强热塑性塑料在许多行业中的使用日益增多。这些复合材料具有许多优点，如比强度高、重量轻、耐磨防锈、刚度高、加工速度快以及制造成本相对较低。在这类材料的许多应用中，多轴循环加载和不同加载源之间的非比例性是不可避免的。本研究采用基于临界面的损伤方法，对短玻璃纤维增强热塑性塑料在不同环境和加载条件下的多轴疲劳行为进行建模。该模型最近被用于短纤维增强热塑性复合材料的单轴疲劳寿命预测。本文将该模型应用于大量多轴疲劳实验数据，结果表明其相关性明显优于文献中使用的其他模型。该模型考虑了纤维取向、应力状态、平均应力和应力集中对多轴疲劳行为的影响。通过将提出的损伤模型应用到一般疲劳模型中，还考虑了温度和频率对多轴疲劳行为的影响。模型预测结果与文献中的实验数据进行了比较和讨论。A new interface bonding improvement method combined with precipitation and hot-pressing process to ameliorate the defects of para aramid paperPing Xie, Na Li, Kairong Zhao, Yutong Cao, Junrong Yu, Yan Wang, Zuming Hudoi:10.1016/j.compositesa.2024.108052 结合沉淀和热压工艺的界面粘合改进新方法可改善对位芳纶纸的缺陷At present, the mechanical properties of para aramid paper (PPTA paper) are still severely challenged since interface bonding defects. In this work, a novel method for improving the interface bonding of PPTA paper was proposed by introducing m-phenylenediamine (MPD) into PPTA molecular chain by copolymerization. Result showed that the addition of MPD could monitor the rigidity and glass transition temperature (Tg) of PPTA. The Tg generated by the copolymerized modified PPTA precipitated fibers (MAPFs) realized micro-melting bonding with adjacent fibers during hot-pressing process. Further optimization of MAPFs precipitation and hot-pressing process improved the tensile strength of paper. Results indicated that the tensile strength of paper made of MAPFs with 60% MPD far beyond PPTA paper (PAP), and was 1.07 times of Nomex paper. The method provides a reference value for the application of high performance PAP in lightweight and high strength fields, broadening the application field of PAP as well.目前，对位芳纶纸（PPTA 纸）的机械性能仍然受到界面粘合缺陷的严重挑战。本研究提出了一种改善 PPTA 纸界面粘结性的新方法，即通过共聚在 PPTA 分子链中引入间苯二胺（MPD）。结果表明，MPD 的加入可监测 PPTA 的刚性和玻璃化转变温度（Tg）。共聚改性 PPTA 沉淀纤维（MAPFs）产生的 Tg 在热压过程中实现了与相邻纤维的微熔粘合。进一步优化 MAPFs 的沉淀和热压工艺可提高纸张的抗张强度。结果表明，60% MPD 的 MAPFs 纸张的抗张强度远远超过 PPTA 纸（PAP），是 Nomex 纸的 1.07 倍。该方法为高性能 PAP 在轻质高强领域的应用提供了参考值，同时也拓宽了 PAP 的应用领域。Composites Part B: EngineeringAn accurate forming model for capturing the nonlinear material behaviour of multilayered binder-stabilised fabrics and predicting fibre wrinklingPeter H. Broberg, Esben Lindgaard, Adam J. Thompson, Jonathan P.-H. Belnoue, Stephen R. Hallett, Brian L.V. Bakdoi:10.1016/j.compositesb.2024.111268捕捉多层粘合剂稳定织物的非线性材料行为并预测纤维起皱的精确成型模型Prefabricated stacks of binder-stabilised dry fabrics are used to increase reinforcement deposition rates in the manufacturing of large composite structures such as wind turbine blades. To ensure optimal part quality, accurate simulation tools may be used to avoid costly trial-and-error experiments. This paper introduces a new modelling framework for predicting wrinkle defects that arise from forming thick binder-stabilised stacks of quasi-unidirectional non-crimp fabric. In this context, quasi-unidirectional non-crimp fabrics are unidirectional rovings stabilised with a backing layer. The non-constant bending stiffness of the fabric is modelled using an asymmetric compressive modulus, while a mixed-mode cohesive formulation with user-defined damage evolution is used for modelling the initial non-constant elastic binder interface stiffness and interface degradation. The model is verified against cantilever bending tests of single fabric layers and transverse shear experiments of bindered fabric layers. Comparison with experimental results on the forming of preforms shows that the model accurately predicts wrinkle location and geometry during the forming of thick binder-stabilised preforms. The error between the wrinkle geometry predicted by the new modelling approach and the experimentally measured wrinkle geometry is reduced by 35% to 94% compared to wrinkles predicted by conventional modelling approaches. The modelling framework is freely available at https://doi.org/10.5281/zenodo.10077428.在风力涡轮机叶片等大型复合材料结构的制造过程中，使用预制的粘合剂稳定干织物堆栈来提高加固沉积率。为确保最佳的零件质量，可使用精确的模拟工具来避免成本高昂的试错实验。本文介绍了一种新的建模框架，用于预测准单向非卷曲织物形成厚粘合剂稳定堆叠时产生的皱褶缺陷。在这种情况下，准单向非卷曲织物是用背衬层稳定的单向粗纱。织物的非恒定弯曲刚度使用非对称压缩模量建模，而混合模式内聚公式与用户定义的损伤演变则用于建模初始非恒定弹性粘合剂界面刚度和界面退化。该模型通过单层织物的悬臂弯曲试验和双层织物的横向剪切试验进行了验证。与预型件成型实验结果的比较表明，该模型能准确预测厚粘合剂稳定预型件成型过程中的皱褶位置和几何形状。与传统建模方法预测的皱纹相比，新建模方法预测的皱纹几何形状与实验测量的皱纹几何形状之间的误差减少了 35% 至 94%。建模框架可在 https://doi.org/10.5281/zenodo.10077428 免费获取。Composites Science and TechnologyTwo-step re-protonation strategy to fabricate aramid nanofiber sheet (ANFS) based high performance composite filmYun Wei, Xin Chen, Zijian Dai, Minhan Cheng, Qiang Fu, Hua Dengdoi:10.1016/j.compscitech.2024.110480 用两步再质子化策略制造基于芳纶纳米纤维片（ANFS）的高性能复合薄膜Aramid nanofibers have aroused great research enthusiasm in functional composites thanks to their numerous advantages. However, the mechanism of proton recovery in aramid nanofibers regeneration is still unclear, and the mechanical properties of aramid nanofibers, which simply and roughly regenerated from water in one-step, are still insufficient. In this work, we explore the mechanism of aramid nanofiber proton reconstruction by eight proton donor ability solvents and prepared a macroscopic sheet-like aramid nanofiber (ANFS). Studies show that weak proton donor is more likely to recover intramolecular -H-bonds, and strong proton donor is more likely to recover intermolecular -H-bonds in aramid nanofibers. Based on above, we proposed a two-step re-protonation strategy (EG + H2O) to recover aramid nanofibers structure to obtain high performance ANFS film. Furthermore, high efficiency thermal transfer channel constructed by aligned BN nanosheets along with ANFS lamellae configuration facilitate high thermal conductivity (in-plane) of 19.66 W m−1 K−1 with surprising mechanical properties with 211 MPa tensile strength, 12.8 % elongation at break, toughness of 17.94 MJ/m3 and only 10 wt% filler. This work provides a novel insight for aramid nanofibers re-protonation and high efficiency heat transfer path to obtain mechanically strong and highly thermal conductive composites.芳纶纳米纤维以其众多优点在功能复合材料领域引起了极大的研究热情。然而，芳纶纳米纤维再生中的质子恢复机理尚不清楚，一步法简单粗暴地从水中再生出的芳纶纳米纤维的力学性能仍有不足。本研究探索了八种质子供体能力溶剂对芳纶纳米纤维质子重构的机理，制备了宏观片状芳纶纳米纤维（ANFS）。研究表明，在芳纶纳米纤维中，弱质子供体更容易恢复分子内-H键，而强质子供体更容易恢复分子间-H键。在此基础上，我们提出了两步再质子化策略（EG + H2O）来恢复芳纶纳米纤维的结构，从而获得高性能的 ANFS 薄膜。此外，由排列整齐的 BN 纳米片和 ANFS 片状结构构建的高效热传导通道可实现 19.66 W m-1 K-1 的高导热率（面内），同时还具有令人惊讶的机械性能：211 兆帕的拉伸强度、12.8 % 的断裂伸长率、17.94 MJ/m3 的韧性，而填料含量仅为 10 wt%。这项研究为芳纶纳米纤维的再质子化和高效传热路径提供了新的见解，从而获得了机械强度高、导热性强的复合材料。来源：复合材料力学仿真Composites FEM

有附件