【新文速递】2024年3月5日固体力学SCI期刊最新文章
今日更新：International Journal of Solids and Structures 2 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 2 篇
International Journal of Solids and Structures
Fatigue life prediction and energy conversion efficiency evaluation of a photovoltaic-thermoelectric device subjected to time-varying thermal and wind hybrid loads
C. Liu, Y.J. Cui, K.F. Wang, B.L. Wang
doi:10.1016/j.ijsolstr.2024.112741
受时变热和风力混合负载影响的光伏热电装置的疲劳寿命预测和能量转换效率评估
The photovoltaic-thermoelectric (PV-TE) device is one of the most promising pollution-free devices along with the booming demand for green electricity. The multilayered PV-TE device has poor interfacial mechanical performance and is subjected to complex cyclic loads. Thus, the interfacial stresses and crack propagation are investigated to deepen understanding of the interfacial fatigue failure mechanism of PV-TE device subjected to the time-varying thermal and wind hybrid loads. The continuity of thermo-electrical–mechanical coupled stress at the interface is fulfilled by employing the modified laminated plate theory. Equations of motion are derived by means of Hamilton’s principle and Galerkin method. It is found that the thermally induced interlaminar shear stress is much larger than the wind-induced stress. The fatigue life varies linearly with wind speed and cold side temperature of the substrate layer. The fatigue life can be prolonged by reducing thickness of the TE leg and decreasing the efficiency temperature coefficient of the PV cell. A balance between the improvements of fatigue life and energy conversion efficiency of the device can be achieved by designing a reasonable thickness of PV cell. The fatigue life and energy conversion efficiency of the device without considering heat losses from PV cell are underestimated, especially at high wind speeds. The simple but useful expressions of fatigue life and energy conversion efficiency with respect to the wind speed and environment temperature are given to guide the engineering applications.
随着人们对绿色电力需求的不断增长，光伏热电（PV-TE）装置成为最有前途的无污染装置之一。多层 PV-TE 设备的界面机械性能较差，而且要承受复杂的循环负载。因此，本文研究了界面应力和裂纹扩展，以加深对 PV-TE 器件在时变热和风力混合载荷作用下的界面疲劳失效机理的理解。界面上热-电-机耦合应力的连续性是通过采用修正的层压板理论来实现的。通过汉密尔顿原理和 Galerkin 方法推导出运动方程。研究发现，热引起的层间剪切应力远大于风引起的应力。疲劳寿命随风速和基材层冷侧温度呈线性变化。通过减小 TE 脚的厚度和降低光伏电池的效率温度系数，可以延长疲劳寿命。通过设计合理厚度的光伏电池，可以在提高设备疲劳寿命和能量转换效率之间取得平衡。如果不考虑光伏电池的热损失，设备的疲劳寿命和能量转换效率就会被低估，尤其是在高风速下。本文给出了疲劳寿命和能量转换效率随风速和环境温度变化的简单而有用的表达式，以指导工程应用。
Effect of hydrogen on the rate-dependent deformation of superelastic NiTi shape memory alloy springs: Experimental observation and thermo-diffusional-mechanically coupled model
Han M. Jiang, Zhenghong Fu, Kaijuan Chen, Qianhua Kan, Chao Yu, Guozheng Kang
doi:10.1016/j.ijsolstr.2024.112743
氢对超弹性镍钛形状记忆合金弹簧随速率变形的影响：实验观察和热扩散力学耦合模型
In practical applications, NiTi shape memory alloy (SMA) devices are often serviced in hydrogen-rich environments, leading to a significant change in their service performance. In this paper, the influence of hydrogen on the rate-dependent deformation of superelastic NiTi SMA helical springs is investigated. In the experimental aspect, electrochemical hydrogen charging is performed for the NiTi SMA springs with two different spring indexes (8.5 and 11.7). Then, multi-step tension-unloading tests with the range of loading rate from 0.1 mm/s to 10 mm/s are performed for the springs with and without hydrogen charging. Experimental results show that hydrogen charging can significantly affect the rate-dependent deformation and temperature evolution of the springs. In the theoretical aspect, a thermo-diffusional-mechanically coupled constitutive model is constructed in the framework of irreversible thermodynamics. In the proposed model, the strains associated with the elasticity, martensite transformation (MT), thermal expansion, hydrogen expansion and plasticity are taken into account. The contributions of lattice and trapped hydrogens to the total hydrogen concentration are considered. The thermodynamic driving forces of MT and plastic deformation are derived by the newly established Helmholtz free energy. The evolution of temperature is derived from the energy conservation equation and Fourier’s law. The evolution of hydrogen concentration is obtained by combining the mass conservation equation and Fick’s law. To accurately describe the deformation behavior of helical spring, a new semi-analytical model is established by addressing the thermo-diffusional-mechanical coupling effect and both the torsion and bending deformation modes. By comparing the predictions with the experimental results, the proposed model's capability to reproduce the rate-dependent deformation of NiTi SMA springs with and without hydrogen charging is validated. Moreover, the deformation behavior of the spring at a variety of loading rates during in-situ hydrogen charging is predicted.
在实际应用中，镍钛形状记忆合金（SMA）器件经常在富氢环境中进行维修，导致其使用性能发生显著变化。本文研究了氢对超弹性镍钛 SMA 螺旋弹簧随速率变化的变形的影响。在实验方面，对两种不同弹簧指数（8.5 和 11.7）的镍钛 SMA 弹簧进行了电化学充氢。然后，对充氢和未充氢的弹簧进行了多步拉伸-卸载试验，加载速率范围为 0.1 mm/s 至 10 mm/s。实验结果表明，充氢会显著影响弹簧随速率变化的变形和温度变化。在理论方面，在不可逆热力学框架下构建了一个热扩散-机械耦合构成模型。在提议的模型中，与弹性、马氏体转变（MT）、热膨胀、氢膨胀和塑性相关的应变都被考虑在内。还考虑了晶格氢和捕获氢对总氢浓度的贡献。马氏体转变和塑性变形的热力学驱动力由新建立的亥姆霍兹自由能推导得出。温度的演变由能量守恒方程和傅里叶定律得出。氢浓度的演变则由质量守恒方程和菲克定律共同得出。为了准确描述螺旋弹簧的变形行为，通过解决热扩散-机械耦合效应以及扭转和弯曲变形模式，建立了一个新的半解析模型。通过将预测结果与实验结果进行比较，验证了所提出的模型能够再现镍钛 SMA 弹簧在充氢和不充氢时随速率变化的变形。此外，还预测了弹簧在原位充氢过程中各种加载速率下的变形行为。
International Journal of Plasticity
Plastic deformation and strengthening mechanism in CoNiV medium-entropy alloy fiber
Lin Deng, Ruixuan Li, Jinru Luo, Shilei Li, Xuefeng Xie, Shangshu Wu, Weiran Zhang, Peter K. Liaw, Elena A. Korznikova, Yong Zhang
doi:10.1016/j.ijplas.2024.103929
CoNiV 中熵合金纤维的塑性变形和强化机理
High/medium-entropy alloys (H/MEAs) are regarded as a potentially viable alternative to conventional metallic fibers for the production of ductile, high-strength fibers, to resolve the inherent trade-off between strength and ductility. The present study involved the cold drawing technique to produce a CoNiV MEA fiber measuring 300 μm in diameter with a length of more than 3 m. The mechanical properties of the FCC matrix can be improved through the inclusion of an appropriate amount of the κ phase via the optimized thermal treatment process. In addition to a yield strength of 1681 MPa and a well-coordinated elongation of 13.4%, the ideal CoNiV fiber demonstrated a substantial ultimate tensile strength of 1932 MPa. Further calculations revealed that the κ phase, which possesses a substantial Von Mises stress of approximately 2715 MPa and an area fraction of 18.2 ±1.1%, was observed to be a primary contributor to the strength. Deformation twins were generated in the FCC matrix as a result of the ultra-high flow stress, which provided adequate ductility. This study offers significant contributions to the understanding of the deformation mechanisms and strengthening effect of the κ phase, thereby facilitating the development of high-performance metallic fibers.
高/中熵合金（H/MEA）被认为是生产延展性高强度纤维的传统金属纤维的潜在可行替代品，可解决强度和延展性之间的固有权衡问题。本研究采用冷拔技术生产出直径为 300 微米、长度超过 3 米的 CoNiV MEA 纤维。除了 1681 兆帕的屈服强度和 13.4% 的协调伸长率外，理想的 CoNiV 纤维还具有 1932 兆帕的巨大极限拉伸强度。进一步的计算表明，κ相具有约 2715 兆帕的巨大 Von Mises 应力和 18.2 ±1.1% 的面积分数，是提高强度的主要因素。超高流动应力在催化裂化基体中产生了变形孪晶，从而提供了足够的延展性。这项研究为了解 κ 相的变形机制和强化效果做出了重要贡献，从而促进了高性能金属纤维的开发。
Thin-Walled Structures
Experimental and numerical investigations of circular concrete filled steel double-skin and double-tube columns exposed to fire
Hongjie Zhu, Shicai Chen, Mizan Ahmed, Qing Quan Liang
doi:10.1016/j.tws.2024.111766
暴露于火灾中的圆形混凝土填充钢双层和双管柱的实验和数值研究
Circular concrete-filled steel double-tube (CFSDT) columns have shown excellent ductility and load-carrying capacity. However, research on the fire resistance of CFSDT columns is still limited. This paper presents the fire tests, finite element (FE) modeling, behavior, and design of circular CFSDT columns and concrete-filled steel double-skin (CFSDS) columns exposed to fire. The fire resistance tests of one CFSDS and six CFSDT columns are described. Analysis is given on the effects of the material strength, the thickness of the inner steel tube, and the load ratio on the fire resistance of the specimens. Finite element models are developed that simulate the fire behavior of filled composite columns with double tubes and are verified by fire test results. The verified FE models are employed to undertake parametric studies on the structural responses of CFSDS and CFSDT columns under fire exposure. A design model is proposed for calculating the fire resistances of CFSDT columns. The results show that the load ratio and the column slenderness ratio have the most significant effect on the fire resistance of CFSDT columns; the cross-sectional parameters remarkably affect the fire resistance; and the material strength has a moderate impact on the fire resistance of CFSDT columns. Compared with CFSDS specimens, the existence of the core concrete significantly increases the fire resistance of CFSDT columns. The proposed design model for fire resistance can yield a safe prediction.
圆形混凝土填充钢双管（CFSDT）柱具有出色的延展性和承载能力。然而，对 CFSDT 柱耐火性的研究仍然有限。本文介绍了圆形 CFSDT 柱和混凝土填充钢双层管（CFSDS）柱在火灾中的耐火试验、有限元（FE）建模、行为和设计。论文介绍了一个 CFSDS 和六个 CFSDT 柱的耐火试验。分析了材料强度、内钢管厚度和荷载比对试样耐火性的影响。开发的有限元模型模拟了双管填充复合材料柱的防火行为，并通过防火测试结果进行了验证。利用经过验证的有限元模型，对 CFSDS 和 CFSDT 柱在火灾暴露下的结构响应进行了参数研究。提出了计算 CFSDT 柱耐火性的设计模型。结果表明，荷载比和柱细长比对 CFSDT 柱的耐火性能影响最大；截面参数对耐火性能影响显著；材料强度对 CFSDT 柱的耐火性能影响适中。与 CFSDS 试件相比，核心混凝土的存在显著提高了 CFSDT 柱的耐火性。所提出的耐火性设计模型可以进行安全预测。
Nonlinear Vibrations of Porous-Hyperelastic Cylindrical Shell under Harmonic Force using Harmonic Balance and Pseudo-Arc Length Continuation Methods
J. Zhang, W. Zhang, Y.F. Zhang
doi:10.1016/j.tws.2024.111767
使用谐波平衡法和伪弧长连续法计算多孔-超弹性圆柱壳在谐波力作用下的非线性振动
The resonant responses are investigated for the porous-hyperelastic Mooney-Rivlin cylindrical shell subjected to a radial harmonic excitation. Considering the higher-order shear deformation theory (HSDT), fourth-order strain-displacement relations are derived, which include the radial geometric imperfections varying along the thickness direction. Using the porous-hyperelastic Mooney-Rivlin constitution relation and Lagrange equation, the differential governing equations of motion are obtained for the porous-hyperelastic cylindrical shells. The resonant conditions are presented and the accuracy of the mathematical models is verified. The harmonic balance and pseudo-arc length continuation methods are used to obtain the amplitude-frequency and forced-amplitude curves. The stability of the solutions is analyzed by Floquet theory. The effects of the external excitation amplitudes, structure parameters and porosity infill parameters on the linear frequencies, amplitude-frequency responses and force-amplitude responses are discussed for the imperfect porous-hyperelastic cylindrical shells. The results show that the linear frequencies of the porous-hyperelastic cylindrical shells increase obviously as the uniform and sigmoid function porosity parameters reach the certain values. The increase of the structure parameters enhances the response amplitudes of the first-order mode and minified response amplitudes of the second-order mode. The decreasing porosity ratios weaken the softening nonlinear behaviors of the porous-hyperelastic cylindrical shells. With the changes of the external excitation amplitudes and structure parameters, the motion of the porous-hyperelastic cylindrical shell indicates that the synchronous vibrations occur with the period and chaotic vibrations alternately.
研究了多孔-热弹性穆尼-里夫林圆柱形壳体在径向谐波激励下的共振响应。考虑到高阶剪切变形理论（HSDT），得出了四阶应变-位移关系，其中包括沿厚度方向变化的径向几何缺陷。利用多孔-热弹性穆尼-里夫林构成关系和拉格朗日方程，得到了多孔-热弹性圆柱壳的微分控制运动方程。提出了共振条件，并验证了数学模型的准确性。利用谐波平衡和伪弧长延续方法获得了振幅-频率和强迫-振幅曲线。利用 Floquet 理论分析了解的稳定性。讨论了外部激励振幅、结构参数和孔隙率填充参数对不完全多孔热弹性圆柱壳的线性频率、振幅-频率响应和力-振幅响应的影响。结果表明，当均匀孔隙率参数和 sigmoid 函数孔隙率参数达到一定值时，多孔-超弹性圆柱壳的线性频率明显增加。结构参数的增加增强了一阶模态的响应振幅，减小了二阶模态的响应振幅。孔隙率的减小削弱了多孔-超弹性圆柱壳的软化非线性行为。随着外部激励振幅和结构参数的变化，多孔-超弹性圆柱壳的运动显示出周期振动和混沌振动交替出现的同步振动。
