【新文速递】2024年1月10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 1 篇，Journal of the Mechanics and Physics of Solids 1 篇，Thin-Walled Structures 3 篇

International Journal of Solids and Structures

A generalized strain model for nonlinear residually stressed magneto-electrically coupled viscoelastic solids

M.H.B.M. Shariff, R. Bustamante, J. Merodio

doi:10.1016/j.ijsolstr.2024.112659

非线性残余应力磁电耦合粘弹性固体的广义应变模型

In this communication a generalized strain approach is proposed, in order to obtain constitutive equations for nonlinear residually stressed magneto-electric coupled viscoelastic solids with short term memory. This approach is a change with respect to the work that has been done in the last decades regarding mechanics of nonlinear solids. The generalized strain model uses spectral invariants, where they have a clear physical meaning and hence are attractive for use in experiments. A specific form for a constitutive equation containing single-variable functions is presented, which are easy to deal with, if compared to multivariable functions. The effects of viscosity, residual stress and magneto-electric fields are studied via the results of boundary value problems, and some of these results are compared with experimental data.

本文提出了一种广义应变方法，以获得具有短期记忆的非线性残余应力磁电耦合粘弹性固体的构成方程。这种方法改变了过去几十年中有关非线性固体力学的研究。广义应变模型使用频谱不变量，这些不变量具有明确的物理意义，因此在实验中很有吸引力。本文介绍了包含单变量函数的构成方程的具体形式，与多变量函数相比，单变量函数易于处理。通过边界值问题的结果研究了粘度、残余应力和磁电场的影响，并将其中一些结果与实验数据进行了比较。

Journal of the Mechanics and Physics of Solids

On the theory of mechanically induced chemiluminescence in multiple network elastomers

Peng Sun, Shaoxing Qu, Rui Xiao

doi:10.1016/j.jmps.2024.105543

论多重网络弹性体的机械诱导化学发光理论

Mechanophores, force-sensitive molecules, can be covalently linked into polymer networks to reveal the damage properties of polymeric materials under deformation. Recent works have introduced bis-adamantyl dioxetane (Ad) into multiple network elastomers. These mechanoluminescent cross-linking molecules can emit luminescence as they break. The experimental results can directly visualize the damage behaviors of multiple network elastomers and reveal the damage mechanism of these materials during deformation. In this work, we develop a constitutive model to describe the complex mechanical behaviors of multiple network elastomers based on observations from mechano-chemiluminescent experiments. The free energy density consists of the contributions from the filler network, the matrix network, and the entangled network. A new type of single-chain model is developed for the filler network, while the classic eight-chain mapping is adopted for the micro-macro transition. The chains in the filler network are progressively damaged under deformation to explain the stress-softening behaviors observed in the small and median strain regions of multiple network elastomers. The entangled network is rooted in individual fragments of the damaged filler network, which can be further damaged in the large deformation regime. The model can comprehensively capture the complex mechanical responses of multiple network elastomers with different values of the prestretching ratio of the filler network, including linear response, necking instability, and re-hardening phenomena in quadruple networks. By assuming that the luminescence intensity of the materials is proportional to the total percentage of damage from both filler and entangled networks, we quantify the relationship between damage and the luminescence intensity from mechanophores, which is further validated in quantifying luminescence intensity against different sets of experimental data on the uniaxial tension of multiple network elastomers. The model is further implemented for finite element analysis, demonstrating the ability to visualize and characterize the damage behaviors around a crack.

力学分子是对力敏感的分子，可通过共价键连接到聚合物网络中，从而揭示聚合物材料在变形过程中的破坏特性。最近的研究将双金刚烷基二氧杂环丁烷（Ad）引入到多种网络弹性体中。这些机械发光交联分子可在断裂时发出荧光。实验结果可以直接观察到多重网络弹性体的损伤行为，并揭示这些材料在变形过程中的损伤机理。在这项工作中，我们根据机械化学发光实验的观察结果，建立了一个构成模型来描述多重网络弹性体的复杂机械行为。自由能密度由填料网络、基体网络和缠结网络的贡献组成。针对填料网络开发了一种新型单链模型，而针对微观-宏观过渡则采用了经典的八链映射。填充网络中的链在变形过程中逐渐损坏，从而解释了在多网络弹性体的小应变区和中值应变区观察到的应力软化行为。缠结网络植根于受损填充网络的单个片段，在大变形机制中会进一步受损。该模型能全面捕捉不同填充网络预拉伸比值的多重网络弹性体的复杂机械响应，包括线性响应、颈缩不稳定性和四重网络中的再硬化现象。通过假定材料的发光强度与填料和纠缠网络的总损伤百分比成正比，我们量化了损伤与来自机械分子的发光强度之间的关系，并根据多网络弹性体单轴拉伸的不同实验数据集进一步验证了发光强度的量化。该模型进一步用于有限元分析，展示了可视化和描述裂纹周围损伤行为的能力。

Thin-Walled Structures

Axial compressive behavior of high-strength steel-UHPC-clad steel composite walls

Ying Wang, Xiang Li, Tianyu Liao, Zhichao Lai, Chenxi Fang, Junbo Zuo

doi:10.1016/j.tws.2024.111588

高强度钢-UHPC 包钢复合墙体的轴向抗压行为

This paper proposed a novel high-strength steel-UHPC-clad steel composite wall (HS-UHPC-CS composite wall) and investigated its axial compressive behavior through experimental and numerical methods. A total of 18 axial compressive tests and finite element (FE) analyses, including parametric studies of 120 cases, were conducted. It was shown that the stud spacing-to-plate thickness ratio and the normalized slenderness ratio notably affected the strength and local buckling, while their influence on the initial stiffness was minor. The strength and initial stiffness were improved, while the ductility was compromised by the presence of ultra-high-performance concrete (UHPC). Steel fiber was critical to the HS-UHPC-CS composite wall, while the lack of steel fiber could trigger premature brittle failure. The influence of the strength of concrete was higher compared to steel plate. The critical buckling stress of the steel plate was calculated using Euler's buckling formula for the clad steel plate of the HS-UHPC-CS composite wall. The results were compared with the ordinary composite wall database. In addition, strength from test results, FE results, and the database were compared were compared with strength calculated by design provisions. It was found that the calculated strength was close but not safe. It was recommended that different concrete contribution coefficients should be applied for HS-UHPC-CS composite walls with different normalized slenderness ratios.

本文提出了一种新型高强度钢-UHPC-覆层钢复合墙体（HS-UHPC-CS 复合墙体），并通过实验和数值方法研究了其轴向抗压行为。共进行了 18 次轴向抗压试验和有限元（FE）分析，包括 120 个案例的参数研究。结果表明，螺栓间距与板厚之比和归一化细长比对强度和局部屈曲有显著影响，而对初始刚度的影响较小。超高性能混凝土（UHPC）的存在提高了强度和初始刚度，而延展性则受到了影响。钢纤维对 HS-UHPC-CS 复合墙体至关重要，而缺乏钢纤维则会引发过早的脆性破坏。与钢板相比，混凝土强度的影响更大。采用欧拉屈曲公式计算了 HS-UHPC-CS 复合墙体包覆钢板的临界屈曲应力。结果与普通复合墙体数据库进行了比较。此外，还将测试结果、FE 结果和数据库中的强度与设计规定计算出的强度进行了比较。结果发现，计算出的强度虽然接近，但并不安全。建议对不同归一化细长比的 HS-UHPC-CS 复合墙体采用不同的混凝土贡献系数。

S890 hot-rolled ultra-high strength steel (UHSS) seamless circular hollow section beam–columns: Testing, modelling and design

Yajin Wang, Andi Su, Hua Yang, Jian Zhao, Yuyin Wang

doi:10.1016/j.tws.2024.111583

S890 热轧超高强度钢 (UHSS) 无缝圆形空心截面梁柱：测试、建模和设计

With the recent rapid development of manufacturing techniques and material science, advanced hot-rolling of ultra-high strength steel (UHSS) with material grades up to S890 becomes possible. The structural behaviour of S890 hot-rolled ultra-high strength steel (UHSS) seamless circular hollow section (CHS) beam–columns fabricated through the advanced manufacturing method, was investigated through testing and numerical modelling and reported in this paper. In the physical testing, a total of 12 beam–columns were firstly tested featuring the flexural buckling failure mode, with the material coupon tests and initial global geometric imperfection measurements performed. FE modelling was then conducted, where the FE models were developed and validated against the test observations. The validated FE models were then adopted in the parametric studies in a wider spectrum of member lengths, cross-section dimensions and loading combinations, resulting in the additional 300 FE data to be generated. Finally, the current design provisions, as set out in Eurocode, American specification and Australian standard, are assessed for their applicability to S890 hot-rolled UHSS seamless CHS beam–columns. It was revealed from the assessment results that the design provisions in three design codes can be accurately applied to S890 hot-rolled UHSS seamless CHS beam–columns.

随着近年来制造技术和材料科学的快速发展，材料等级高达 S890 的超高强度钢（UHSS）的先进热轧技术已成为可能。本文通过测试和数值模拟研究了采用先进制造方法制造的 S890 热轧超高强度钢（UHSS）无缝圆形空心截面（CHS）梁柱的结构行为，并对其进行了报告。在物理测试中，首先对 12 根梁柱进行了挠曲屈曲失效模式测试，并进行了材料试样测试和初步的全局几何缺陷测量。然后进行 FE 建模，开发 FE 模型并根据测试观测结果进行验证。经过验证的 FE 模型随后被应用于参数研究，研究范围包括更广泛的构件长度、横截面尺寸和加载组合，从而产生了额外的 300 个 FE 数据。最后，评估了欧洲规范、美国规范和澳大利亚标准中的现行设计规定对 S890 热轧 UHSS 无缝 CHS 梁柱的适用性。评估结果表明，三种设计规范中的设计规定均可准确地应用于 S890 热轧 UHSS 无缝 CHS 梁柱。

Investigation on the mechanical properties and damage mechanisms of plain-woven composites at elevated temperatures through a newly-designed testing system

Hao Lu, Tao Zheng, Li Zhang, Xiaodong Liu, Jindi Zhou, Xiaojian Han, Licheng Guo

doi:10.1016/j.tws.2024.111587

通过新设计的测试系统研究平织复合材料在高温下的力学性能和损伤机理

In this paper, the mechanical properties and damage mechanisms of T800/epoxy plain-woven composites at elevated temperatures are investigated by using a newly-designed testing system, including improved digital image correlation (DIC) equipment, modified fixture and dedicated environmental chamber. The molecular structure, glass transition temperature (Tg) and thermal stability of the composites and epoxy resin are separately characterized. The tensile and compressive experiments of plain-woven composites are conducted at 20°C, 60°C, 100°C and 150°C. The full-field strain distributions of plain-woven composites at elevated temperatures can be accurately measured by the newly-designed testing system. The experimental results indicate that the modulus, failure strengths and damage mechanisms of plain-woven composites are highly temperature dependent. In general, the tensile and compressive moduli decrease slightly with increasing temperature, and the temperature exhibits a more pronounced weakening effect on compressive strength. When the temperature exceeds Tg, the resin attached to fiber yarns is gelatinous. High temperatures severely degrade the interlayer performance of plain-woven composites, resulting in severe delamination accumulation. Particularly, a modified Gibson model is proposed to predict the failure strengths of plain-woven composites at elevated temperatures, which is in high agreement with the experimental results.

本文使用新设计的测试系统，包括改进的数字图像相关（DIC）设备、改良的夹具和专用环境室，研究了 T800/ 环氧平织复合材料在高温下的力学性能和损伤机理。分别对复合材料和环氧树脂的分子结构、玻璃化转变温度（Tg）和热稳定性进行了表征。在 20°C、60°C、100°C 和 150°C 下对平织复合材料进行了拉伸和压缩实验。新设计的测试系统可精确测量平织复合材料在高温下的全场应变分布。实验结果表明，平织复合材料的模量、破坏强度和破坏机制与温度高度相关。一般来说，拉伸模量和压缩模量随温度升高而略有下降，而温度对压缩强度的削弱作用更为明显。当温度超过 Tg 时，附着在纤维纱上的树脂呈胶状。高温会严重降低平织复合材料的层间性能，导致严重的分层累积。特别是提出了一种改进的 Gibson 模型来预测平织复合材料在高温下的破坏强度，该模型与实验结果高度吻合。

来源：复合材料力学仿真Composites FEM

【新文速递】2024年1月13日固体力学SCI期刊最新文章

今日更新：International Journal of Plasticity 1 篇，Thin-Walled Structures 3 篇International Journal of PlasticityStrengthening and ductilization of a refractory high-entropy alloy over a wide strain rate range by multiple heterostructuresRuixin Wang, Yu Tang, Yuanlin Ai, Shun Li, Li'an Zhu, Shuxin Baidoi:10.1016/j.ijplas.2024.103882 通过多重异质结构在宽应变率范围内强化和延展难熔高熵合金To improve the mechanical properties of refractory high-entropy alloy (RHEA), whose strain hardening capacity is relatively weak, over a wide strain rate range, the multi-heterostructure strategy is investigated in this work. Based on the composition and annealing design, the multi-heterostructure consisting of two mutually coherent body-centred cubic solid solution matrices and penetrating complex phases is achieved in TiZrNbTaNi0.05 RHEA (MH-RHEA). Under quasi-static loading, this multi-heterostructure takes both good precipitation strengthening and hetero-deformation-induced hardening effects, diversifies the deformation modes, finally promotes the strain hardening capacity and deformation homogeneity. The tensile yield strength, ultimate tensile strength and elongation of MH-RHEA are 1195±12 MPa, 1235±9 MPa and 22.4±1.0%, respectively, which are 18%, 20% and 50% higher than those of the base alloy. Under dynamic loading (∼103 s−1), the thermal effect can be neutralized and the deformation localization is avoided. Consequently, a high yield strength of ∼1450 MPa and a large ultimate strain of ∼25% without fracture at a high strain rate of 2390 s−1 are realized in MH-RHEA. This heterostructure strategy offers a new paradigm to enhance the strength and ductility simultaneously of RHEAs over a wide strain rate range.难熔高熵合金（RHEA）的应变硬化能力相对较弱，为改善其在宽应变速率范围内的机械性能，本研究采用了多异质结构策略。基于成分和退火设计，在 TiZrNbTaNi0.05 RHEA（MH-RHEA）中实现了由两个相互协调的体心立方固溶体基体和渗透复相组成的多异质结构。在准静态加载条件下，这种多元异质结构兼具良好的沉淀强化和异质变形诱导硬化效应，使变形模式多样化，最终提高了应变硬化能力和变形均匀性。MH-RHEA 的拉伸屈服强度、极限拉伸强度和伸长率分别为 1195±12MPa、1235±9MPa 和 22.4±1.0%，比基合金分别高出 18%、20% 和 50%。在动态加载（∼103 s-1）条件下，可以中和热效应，避免变形局部化。因此，在 2390 s-1 的高应变速率下，MH-RHEA 实现了 ∼1450 MPa 的高屈服强度和 ∼25% 的大极限应变，且没有断裂。这种异质结构策略为在宽应变速率范围内同时提高 RHEA 的强度和延展性提供了一种新的范例。Thin-Walled StructuresOut-of-plane Engineering Constants of Beetle Elytra Inspired Sandwich CoresXindi Yu, Qicheng Zhang, Mark Schenk, Fabrizio Scarpadoi:10.1016/j.tws.2024.111571甲虫叶甲启发的三明治夹芯平面外工程常数The Beetle Elytron Plate (BEP) is a new type of biomimetic sandwich core developed as a potential replacement of classical honeycomb cores in sandwich panels. This work investigates the out-of-plane engineering elastic constants, including Young's and pure shear moduli of parametric BEP cellular topologies. The BEP core configurations are simulated using Finite Element models, with both full-scale and representative unit cells for asymptotic homogenization. The numerical models are also validated by flatwise compression and out-of-plane pure shear loading experiments performed according to ASTM standards. The benchmarked models are then used to perform a parametric analysis of the beetle elytra cellular cores against their geometry characteristics. Results show that the out-of-plane Young's modulus E3/Es and the transverse pure shear modulus G31/Es of both BEP configurations are larger than those of the classic hexagonal honeycombs and increase when the size of the unit cell cylinders, or rib thickness become large. The specific shear moduli of the beetle-elytra inspired honeycombs are however lower than those of classical pure hexagonal honeycomb configurations, although the added presence of cylinders within the cell configuration offers opportunities for tailoring the design of multifunctional cores.Beetle Elytron Plate（BEP）是一种新型仿生物夹层芯材，可替代夹层板中的传统蜂窝芯材。这项工作研究了平面外工程弹性常数，包括 BEP 蜂窝拓扑参数的杨氏模量和纯剪切模量。采用有限元模型模拟 BEP 核心配置，并使用全尺寸和代表性单元格进行渐近均质化。根据 ASTM 标准进行的平面压缩和平面外纯剪切加载实验也对数值模型进行了验证。然后使用基准模型对甲虫鞘甲壳细胞核的几何特征进行参数分析。结果表明，平面外杨氏模量 E3 / Es 和横向纯剪切模量 G31/Es 都比传统的六边形蜂窝大，而且当单胞圆柱体的尺寸或肋条厚度变大时，其剪切模量也会增大。然而，受甲虫鳞片启发的蜂窝的特定剪切模量低于经典的纯六边形蜂窝结构，尽管在单元结构中增加了圆柱体，为定制多功能芯材的设计提供了机会。Damage and energy absorption behavior of CFRP/aluminum hybrid open-section thin-walled columns subjected to quasi-static loadingHaolei Mou, Yingshi Chen, Zhenyu Feng, Haibao Liudoi:10.1016/j.tws.2024.111593承受准静态荷载的 CFRP/铝混合开口薄壁柱的损伤和能量吸收行为In this study, the damage and energy absorption behaviors of carbon fiber reinforced plastic (CFRP)/aluminum (Al) hybrid open-section thin-walled columns were explored. The results showed that hybrid columns exhibited tremendous merits for the energy absorption. The CFRP-Al columns could absorb 61.21% and 44.11% more energy than the corresponding single CFRP columns and the single Al columns with the same thickness, respectively. Furthermore, the specific energy absorption (SEA) of HI-2 columns was 16.29% and 85.06% higher than that of the corresponding single CFRP columns and the single Al columns. However, different configurations of hybrid columns underwent different damage and failure processes. In addition to Al-CFRP columns, the open-section thin-walled structure exhibited a positive hybrid interaction effect, and the energy dissipated 45.6% of the total energy absorption. The Al inner layer absorbed a large amount of energy by inducing the CFRP to undergo large deformation and progressive damage, thus, the CFRP-Al columns and CFRP-Al-CFRP columns dissipated more energy and had a higher energy absorption efficiency. Concurrently, the energy absorption behavior of the hybrid column could be changed by different proportions of 45° layers. The present research on damage and energy absorption mechanisms provides some guidance for the lightweight and crashworthiness design of hybrid open-section thin-walled columns.本研究探讨了碳纤维增强塑料（CFRP）/铝（Al）混合开口薄壁柱的损伤和能量吸收行为。结果表明，混合柱在能量吸收方面表现出巨大优势。与相同厚度的单一 CFRP 柱和单一铝柱相比，CFRP-铝柱吸收的能量分别增加了 61.21% 和 44.11%。此外，HI-2 柱的比能量吸收（SEA）分别比相应的单一 CFRP 柱和单一铝柱高出 16.29% 和 85.06%。然而，不同结构的混合柱经历了不同的破坏和失效过程。除 Al-CFRP 柱外，开截面薄壁结构也表现出了积极的混合相互作用效应，能量耗散占总吸能的 45.6%。Al 内层通过诱导 CFRP 发生大变形和渐进破坏吸收了大量能量，因此 CFRP-Al 柱和 CFRP-Al-CFRP 柱耗散的能量更多，能量吸收效率更高。同时，45°层的不同比例可改变混合柱的能量吸收行为。本研究对破坏和能量吸收机理的研究为混合开截面薄壁柱的轻量化和耐撞性设计提供了一些指导。Thermal analysis for laminated plates with arbitrary supports under non-uniform temperature boundary conditionsHai Qian, Zhentao Wang, Chunhua Lu, Dongsheng Cai, Yang Yangdoi:10.1016/j.tws.2024.111595非均匀温度边界条件下带有任意支撑的层压板的热分析This paper aims to investigate thermal behaviors of composite laminated plates with different supports under non-uniform temperature boundary conditions. The thermo-elastic solutions of temperature, displacements, and stresses for the laminated plate with arbitrary layer numbers and thickness are obtained based on the three-dimensional theory of thermoelasticity. By applying the Fourier law of heat conduction and the thermoelastic equations, the state-space equations are established by employing the temperature, heat flux, displacements, and stresses as state variables without the hypothesis of displacement form. The differential quadrature method is introduced to discretize the in-plane state variables. On the basis of the continuities of state variables at the interfaces in the laminated plate, the relationships of temperature, heat flux, displacements, and stresses between the top and bottom surfaces can be derived. By simultaneously considering temperature and mechanical boundary conditions applied to the surfaces of the laminated plate, the initial state variables for temperature, displacements, and stresses can be determined uniquely. The errors in the temperature, displacements and stresses resulting from the differential quadrature method can be eliminated by incrementally augmenting the number of sampling points in the convergence study. The accuracy of the present method is thoroughly verified by comparing the current results with both the finite element solutions and the findings reported in previous literature. Finally, the influences of surface temperature, length-to-thickness ratios, material properties, layer numbers, and support types for the distributions of the temperature field, displacements, and stresses in the laminated plate are discussed in detail.本文旨在研究在非均匀温度边界条件下具有不同支撑的复合层压板的热行为。基于三维热弹性理论，得到了任意层数和厚度的层压板的温度、位移和应力的热弹性解。通过应用热传导的傅立叶定律和热弹性方程，以温度、热通量、位移和应力为状态变量，建立了状态空间方程，而不假定位移形式。引入微分正交法对平面内状态变量进行离散化。在层压板界面状态变量连续性的基础上，可以推导出上下表面之间的温度、热通量、位移和应力关系。通过同时考虑层压板表面的温度和机械边界条件，可以唯一确定温度、位移和应力的初始状态变量。在收敛性研究中，可以通过逐步增加采样点的数量来消除微分正交法产生的温度、位移和应力误差。通过将当前结果与有限元求解结果和以往文献中的结论进行比较，彻底验证了本方法的准确性。最后，详细讨论了表面温度、长度厚度比、材料特性、层数和支撑类型对层压板中温度场、位移和应力分布的影响。来源：复合材料力学仿真Composites FEM