【新文速递】2024年1月15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 2 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 1 篇

International Journal of Solids and Structures

Data-driven analysis of structural instabilities in electroactive polymer bilayers based on a variational saddle-point principle

Siddharth Sriram, Elten Polukhov, Marc-André Keip

doi:10.1016/j.ijsolstr.2024.112663

基于变分鞍点原理的电活性聚合物双层结构不稳定性数据驱动分析

In this work, we use a data-driven approach to model the onset of wrinkling in composite dielectric elastomer (DE) bilayer structures that are subjected to combined electro-mechanical loading conditions. Specifically, the critical surface-charge density required to activate wrinkling and the resulting number of half-waves are determined as functions of the tunable geometrical and material features of the DE bilayer using supervised machine learning (ML) models. The required data for the ML surrogates is generated using a finite-element-based framework for structural stability analysis of the DE bilayer, which is rooted in a variational saddle-point formulation for non-linear electro-elastostatics. Within the considered broad design space for the DE bilayer, the data points are sampled according to a Latin-hypercube-type design, following which training and test datasets containing the values of the target variables for the sampled input-feature vectors are generated using the adopted finite-element framework. Subsequently, we implement and compare the capabilities of different ML models to capture accurately the non-linear dependence of the wrinkling characteristics on the tunable features of the DE bilayer.

在这项工作中，我们使用数据驱动的方法来模拟复合介质弹性体(DE)双层结构在复合机电载荷条件下起皱的开始。具体来说，激活起皱所需的临界表面电荷密度和产生的半波数是使用监督机器学习(ML)模型确定的，作为DE双层可调几何和材料特征的函数。ML替代品所需的数据是使用基于有限元的框架生成的，用于DE双层结构稳定性分析，该框架植根于非线性电弹性静力学的变分鞍点公式。在考虑DE双层的广泛设计空间内，根据拉丁超立方体类型的设计对数据点进行采样，然后使用所采用的有限元框架生成包含采样输入特征向量的目标变量值的训练和测试数据集。随后，我们实现并比较了不同机器学习模型的能力，以准确捕获皱褶特征对DE双层可调特征的非线性依赖。

Journal of the Mechanics and Physics of Solids

Nonlinear constitutive model of CFRP composites under constant direct current: combined effects of thermal damage and dielectric degradation

Haoran Song, Zheng Zhong

doi:10.1016/j.jmps.2024.105547

恒直流电作用下CFRP复合材料的非线性本构模型:热损伤和介电退化的联合效应

Prolonged exposure to low-density direct current (DC) can lead to mechanical degradation of carbon fiber-reinforced polymer (CFRP) composites, posing significant risks to material safety and reliability. This paper presents a nonlinear constitutive model to elucidate the mechanical degradation of CFRP composites when subjected to DC influences. Grounded in the principles of non-equilibrium thermodynamics, this model introduces two internal variables to account for the impact of thermal damage and dielectric degradation on the Helmholtz free energy. Furthermore, specialized dissipation functions are employed to derive the evolution equations governing these internal variables. Utilizing the model, we analyze the damage progression in carbon fiber–epoxy laminates subjected to constant DC loading. The theoretically projected resistivity and elastic modulus align closely with available experimental data in literature, thus confirming the rationality and accuracy of the proposed model. This model holds the potential to forecast the long-term evolution of mechanical properties in unidirectionally reinforced composite materials with varying carbon fiber contents under the influence of DC, thereby furnishing a theoretical foundation for enhancing the reliability design of CFRP composites in electrically-charged environments.

长时间暴露在低密度直流电(DC)下会导致碳纤维增强聚合物(CFRP)复合材料的机械降解，对材料的安全性和可靠性构成重大风险。本文提出了一种非线性本构模型来解释CFRP复合材料在直流作用下的力学退化。该模型以非平衡态热力学原理为基础，引入了两个内部变量来解释热损伤和介电退化对亥姆霍兹自由能的影响。此外，利用专门的耗散函数推导出控制这些内部变量的演化方程。利用该模型分析了碳纤维环氧复合材料在恒定直流载荷作用下的损伤过程。理论推算的电阻率和弹性模量与文献实验数据吻合较好，证实了模型的合理性和准确性。该模型具有预测不同碳纤维含量的单向增强复合材料在直流影响下力学性能长期演变的潜力，从而为提高CFRP复合材料在带电环境下的可靠性设计提供理论依据。

Temperature-Dependent, Multi-Mechanism Crystal Plasticity Reveals the Deformation and Failure Behaviour of Multi-Principal Element Alloys

Yilun Xu, Xiaochong Lu, Xinyu Yang, Wanghui Li, Zachary Aitken, Guglielmo Vastola, Huajian Gao, Yong-Wei Zhang

doi:10.1016/j.jmps.2024.105549

温度相关的多机制晶体塑性揭示了多主元素合金的变形和破坏行为

In this work, we have developed a temperature-dependent, multi-mechanism crystal plasticity (CP) model aimed at unravelling the deformation and failure resistance of Cantor alloy-like multi-principal element alloys (MPEA) under both uniaxial tensile and cyclic loading conditions. Three deformation mechanisms: dislocation slip, deformation twinning, and phase transformation are considered under a unified stress-driven, thermally activated law. In addition, the effect of short-range ordering (SRO) is introduced by accounting for the inhomogeneous distributions of material properties within individual grains. Our work yields the following key findings: (1) The rate- and temperature-sensitivity of the materials, such as the occurrence and sequence of dislocation slip, deformation twinning, and martensitic phase transformation observed in experiments, can be captured through the calibrated material properties. (2) The enhancement of the mechanical response of the Cantor alloy-like MPEAs due to the SRO effect is intrinsically linked to the generation of geometrically necessary dislocations resulting from localized variations in material properties. (3) The excellent fatigue and fracture resistance exhibited by Cantor alloy-like MPEAs at low temperatures can be attributed to the homogenization of stored energy density within the microstructure. This homogenization arises from the development of deformation twinning and martensitic phase transformation. Our newly developed CP model and the key findings provide a valuable guide for the design of MPEAs to achieve superior fatigue and fracture resistance without compromising their inherent strength.

在这项工作中，我们开发了一个温度依赖的多机制晶体塑性(CP)模型，旨在揭示Cantor合金类多主元素合金(MPEA)在单轴拉伸和循环加载条件下的变形和抗破坏能力。在统一的应力驱动、热激活规律下，考虑了位错滑移、变形孪晶和相变三种变形机制。此外，通过考虑单个晶粒内材料性能的不均匀分布，引入了短程有序(SRO)的影响。我们的工作产生了以下关键发现:(1)材料的速率和温度敏感性，例如在实验中观察到的位错滑移、变形孪晶和马氏体相变的发生和顺序，可以通过校准的材料特性来捕获。(2) SRO效应对类康托合金MPEAs力学响应的增强与材料性能局部变化引起的几何必要位错的产生有着内在的联系。(3) Cantor类合金mpea在低温下表现出优异的抗疲劳性和抗断裂性，这可归因于微观组织内存储能量密度的均匀化。这种均质化是由形变孪晶和马氏体相变的发展引起的。我们新开发的CP模型和关键发现为mpea的设计提供了有价值的指导，从而在不影响其固有强度的情况下实现卓越的抗疲劳和断裂性能。

International Journal of Plasticity

Anisotropic and heterogeneous acoustoplasticity of α-Ti during ultrasonic vibration assisted compression: modeling and experiments

Haidong Zhang, Lei Deng, Yi Hao, Cheng Li, Xuefeng Tang, Pan Gong, Mao Zhang, Junsong Jin, Xinyun Wang

doi:10.1016/j.ijplas.2024.103886

超声振动辅助压缩过程中α-Ti的各向异性和非均质声塑性:模型和实验

Introducing ultrasonic vibration (UV) into the plastic deformation process is a promising and efficient way to improve the formability of metallic materials. However, the acoustoplasticity of α-Ti with pronounced anisotropic behavior during UV-assisted deformation is still not well understood, and the underlying mechanisms associated with the ultrasonic effect on multiple slip/twinning systems remain ambiguous. In this research, the anisotropic and heterogeneous acoustoplasticity of α-Ti was investigated through modeling and experiments. A novel acoustic crystal plasticity model considering the anisotropic ultrasonic response of multiple slip/twinning systems was proposed, in which the ultrasonic softening is determined by the coupling effect of crystal orientation, mechanical threshold, and ultrasonic energy density. The proposed model was validated through the mechanical response of the UV-assisted compression and the twin volume fraction of α-Ti specimens along RD, TD, and ND directions. Full-field crystal plasticity simulations regarding UV-assisted compression were carried out. Then the mechanism of the acoustoplasticity of α-Ti was explored via the analysis of ultrasonic activation on multiple slip/twinning systems and the grain scale deformation behavior. A considerable anisotropic and heterogeneous ultrasonic softening effect of α-Ti was found, and the anisotropy as well as the magnitude of ultrasonic softening increase with the ultrasonic energy density. The ultrasonically activated deformation modes gradually change from prismatic slip and tensile twinning to basal slip and compressive twinning from RD, TD to ND specimens, which results in a higher average CRSS decrease and more pronounced ultrasonic softening macroscopically. The grain scale stress inhomogeneity of α-Ti is relieved under UV, and the local deformation and grain rotation are both enhanced. The dislocation motion and twinning behavior are both promoted by UV. The facilitated twinning behavior can be attributed to the enhanced dislocation assisted nucleation and propagation of deformation twins under UV. These findings provide a fundamental understanding of the anisotropic and heterogeneous acoustoplasticity of α-Ti during the UV-assisted deformation process.

在塑性变形过程中引入超声振动是提高金属材料成形性的一种有效途径。然而，具有明显各向异性行为的α-Ti在紫外辅助变形中的声塑性仍未得到很好的理解，并且超声效应在多滑移/孪晶体系中的潜在机制仍不清楚。本研究通过模型和实验研究了α-Ti的各向异性和非均质声塑性。提出了一种考虑多滑移/孪晶系统各向异性超声响应的声学晶体塑性模型，该模型中超声软化由晶体取向、力学阈值和超声能量密度的耦合效应决定。通过紫外辅助压缩的力学响应和α-Ti试样沿RD、TD和ND方向的双体积分数验证了该模型的有效性。进行了紫外辅助压缩下的全场晶体塑性模拟。然后通过超声对多滑移/孪晶体系的激活和晶粒尺度变形行为分析，探讨α-Ti的声塑性机理。α-Ti具有明显的各向异性和非均质超声软化效应，且各向异性和超声软化幅度随超声能量密度的增大而增大。从RD、TD到ND试样，超声激活变形模式由棱柱滑移和拉伸孪晶逐渐转变为基底滑移和压缩孪晶，导致宏观上CRSS平均降幅较大，超声软化更为明显。UV作用下α-Ti的晶粒尺度应力不均匀性得到缓解，局部变形和晶粒旋转均增强。紫外光促进了位错运动和孪晶行为。紫外光作用下，位错辅助变形孪晶形核和扩展的增强是促进孪晶行为的主要原因。这些发现为α-Ti在紫外辅助变形过程中的各向异性和非均质声塑性提供了基本的认识。

Thin-Walled Structures

Nonlinear Electromechanical Responses in Multi-layered Fiber-reinforced Dielectric Elastomer Composites

Marzie Majidi, Masoud Asgari

doi:10.1016/j.tws.2024.111599

多层纤维增强介电弹性体复合材料的非线性机电响应

The capabilities of dielectric elastomer actuators (DEAs) across various applications of soft smart materials constantly expands. However, the electromechanical behavior of multi-layer anisotropic dielectric elastomer composites (DECs), has not been studied accurately despite of its great potentials. Hence, this paper proposes a comprehensive coupled electromechanical model to address this issue and effectively capture various attributes of such an actuator including the number of layers and layers’ configuration. Using a coupled nonlinear model enables it to analyze multi-layer DECs with an unlimited number of layers, and reinforcing fiber families. A new user defined material subroutine is developed to explore the actuation performance of different multi-layer DECs such as binder, diaphragm, and tubular actuators. It provides a unique insight into effects of the number and arrangement of layers on the electromechanical performance of these actuators. Experimental results have been used for validation of developed model and numerical implementation. The results propose a practical tool for designing and optimizing fiber-reinforced multi-layer DECs based on objective purposes, contributing to developing more efficient and reliable electromechanical models for these materials.

介电弹性体致动器(dea)在各种软智能材料应用中的能力不断扩大。然而，多层各向异性介电弹性体复合材料(DECs)的机电性能虽然具有很大的潜力，但尚未得到准确的研究。因此，本文提出了一个综合的耦合机电模型来解决这一问题，并有效地捕获了该执行器的各种属性，包括层数和层的配置。采用耦合非线性模型可以分析无限层数的多层DECs和增强纤维族。开发了一种新的用户自定义材料子程序，用于探索不同多层DECs(粘结器、膜片和管状执行器)的驱动性能。它提供了一个独特的见解，对这些执行器的机电性能层的数量和安排的影响。实验结果用于验证所建立的模型和数值实现。研究结果为基于客观目的设计和优化纤维增强多层DECs提供了实用工具，有助于开发更有效和可靠的这些材料的机电模型。

来源：复合材料力学仿真Composites FEM

【新文速递】2024年1月17日固体力学SCI期刊最新文章

今日更新：Mechanics of Materials 1 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 3 篇Mechanics of MaterialsTime–temperature correlations of amorphous thermoplastics at large strains based on molecular dynamics simulationsWuyang Zhao, Rui Xiao, Paul Steinmann, Sebastian Pfallerdoi:10.1016/j.mechmat.2024.104926基于分子动力学模拟的大应变下非晶态热塑性塑料的时间-温度相关性In this paper, we investigate the time–temperature correlation of amorphous thermoplastics at large strains based on coarse-grained molecular dynamics simulations. This correlation behavior is characterized by the strain hardening modulus in uniaxial tension simulations at different strain rates across the glass transition region. The temperature regime is divided into a melt zone, a glassy zone, and a transition zone between them, according to the storage modulus calculated from dynamic mechanical analysis (DMA) at small strains. In the melt zone, the existence of time–temperature superposition (TTS) at large strains is verified by constructing a master curve of the hardening modulus. The obtained shift factors are then compared to those from DMA at small strains, showing that the TTS behavior is transferable between small and large strains. In the glassy zone, the effects of time and temperature are not superposable at large strains but still can be correlated. To demonstrate this correlation behavior, we introduce a level set of the hardening modulus with a variable pair of strain rate and temperature. Pairs lying in the same level result in coincident stress–strain curves at large strains. The transferability of the correlation behavior between large and small strains is validated by comparing these stress–strain curves at small strains in the pre-yield region. In the transition zone, the correlation behavior is studied with both aforementioned methods, showing that TTS is applicable to large strains but not transferable to small strains. Finally, we propose a phenomenological constitutive model for uniaxial tension to demonstrate the time–temperature correlation at large strains, considering different constant strain rates and temperatures.在本文中，我们基于粗粒度分子动力学模拟研究了大应变下非晶热塑性塑料的时间-温度相关性。在不同的应变速率下，单轴拉伸模拟的应变硬化模量表征了这种相关行为。根据动态力学分析(DMA)计算的小应变下的存储模量，将温度区划分为熔融区、玻璃化区和两者之间的过渡区。通过构建硬化模量主曲线，验证了在大应变下熔体存在时间-温度叠加现象。然后将得到的位移因子与DMA在小应变下的位移因子进行比较，表明TTS行为在小应变和大应变之间是可转移的。在玻璃区，时间和温度的影响在大应变下不重叠，但仍然可以相关。为了证明这种相关行为，我们引入了应变速率和温度对可变的硬化模量水平集。在大应变下，处于同一水平的对导致应力-应变曲线一致。通过对预屈服区小应变应力-应变曲线的比较，验证了大应变与小应变相关行为的可转移性。在过渡区，用上述两种方法研究了相关行为，表明TTS适用于大菌株，但不适用于小菌株。最后，我们提出了单轴拉伸的现象学本构模型，以证明在大应变下，考虑不同的恒定应变率和温度下的时间-温度相关性。International Journal of PlasticityInfluences of the evolving plastic behavior of sheet metal on V-bending and springback analysis considering different stress statesChong Zhang, Yanshan Loudoi:10.1016/j.ijplas.2024.103889考虑不同应力状态下板料塑性行为变化对v型弯曲和回弹分析的影响Bending is a common forming process that covers various stress states during sheet metal forming, mainly from uniaxial to plane strain states of both tension and compression depending on the inner or outer sides of the sheet. To model the tension-compression asymmetry (TCA) at different stress states, a five stress states-sensitive (Five-SSS) yield function is proposed. The non-linear effect of stress triaxiality η on plasticity is considered. Multiple analytical calibration methods are obtained for the Five-SSS function by considering different groups of stress states from equi-biaxial compression to equi-biaxial tension. One of the methods considers the uniaxial tension, uniaxial compression, plane strain tension, plane strain compression and equi-biaxial tension, which is used to simulate the V-bending process of an advanced high-strength steel QP1180 and a magnesium alloy AZ31. A modified Lode-dependent anisotropic-asymmetric (LAA) function is adopted as plastic potential to model both the TCA and evolution of r-value. The Five-SSS + modified LAA functions can predict the double shift of neutral layer during V-bending for the two investigated materials due to multiple reverse loading in the neutral layer shift zone. For the springback prediction of V-bending, it is observed that the Five-SSS yield function can highly improve the prediction accuracy compared to other functions because it models the TCA under both uniaxial and plane strain states. In addition, the TCA of unloading modulus should be considered for AZ31 to significantly improve the accuracy of springback prediction.弯曲是一种常见的成形工艺，它涵盖了金属板材成形过程中的各种应力状态，主要是从单轴应变到平面应变的拉伸和压缩状态，具体取决于板材的内侧或外侧。为了模拟不同应力状态下的拉伸-压缩不对称（TCA），提出了五应力状态敏感（Five-SSS）屈服函数。考虑了应力三轴性 η 对塑性的非线性影响。通过考虑从等轴压缩到等轴拉伸的不同应力状态组，获得了五应力状态敏感屈服函数的多种分析校准方法。其中一种方法考虑了单轴拉伸、单轴压缩、平面应变拉伸、平面应变压缩和等轴拉伸，用于模拟先进高强度钢 QP1180 和镁合金 AZ31 的 V 形弯曲过程。采用改进的 Lode-dependent anisotropic-asymmetric (LAA) 函数作为塑性势能来模拟 TCA 和 r 值的演变。由于中性层偏移区存在多重反向加载，Five-SSS + 改进的 LAA 函数可以预测两种被研究材料在 V 型弯曲过程中中性层的双重偏移。对于 V 形弯曲的回弹预测，可以观察到，与其他函数相比，Five-SSS 屈服函数可以极大地提高预测精度，因为它对单轴和平面应变状态下的 TCA 都进行了建模。此外，应考虑 AZ31 的卸载模量 TCA，以显著提高回弹预测精度。Thin-Walled StructuresLow-velocity impact behavior of origami-inspired honeycomb acoustic metamaterial structureYao Chen, Pan Shi, Jialong Wei, Tianyu Xie, Jian Feng, Pooya Sarehdoi:10.1016/j.tws.2024.111607 折纸蜂窝声学超材料结构的低速冲击性能The ancient origami technique has inspired numerous acoustic metamaterials, and varieties of honeycomb sandwich structures with remarkable energy absorption capacity. This study introduces an origami-inspired honeycomb acoustic metamaterial structure designed for engineering applications that demand both impact resistance and sound absorption. This acoustic metamaterial structure is created by bonding the panel containing periodically distributed perforated holes and the panel without perforations to periodical Bellow tube unit cells. The acoustic wave propagation and drop-weight impact simulations are conducted to investigate the acoustic performance and low-velocity impact behavior of the structure. The results show that the Bellow honeycomb structure exhibits superior sound absorption capacity over the two frequency ranges, outperforming conventional honeycomb structures. In comparison to conventional hexagonal honeycomb structure, we find that the Bellow acoustic metamaterial structure demonstrates enhanced impact resistance and energy absorption capacity. Its mechanical performance under low-velocity impact can be further enhanced by increasing story height. Besides, matrix material of the origami foldcore can be tailored to suit various application scenarios. This novel acoustic metamaterial structure holds promise for applications in noise control with transportation, civil, mechanical, and aerospace engineering.古老的折纸技术启发了许多声学超材料，以及各种具有显著能量吸收能力的蜂窝夹层结构。本研究介绍了一种折纸蜂窝声学超材料结构，设计用于需要抗冲击和吸声的工程应用。这种声学超材料结构是通过将含有周期性分布穿孔孔的面板和没有穿孔的面板粘合到周期性波纹管单元细胞上而形成的。为了研究结构的声学性能和低速冲击特性，进行了声波传播和落锤冲击仿真。结果表明，波纹管蜂窝结构在两个频率范围内的吸声能力均优于传统蜂窝结构。与传统的六边形蜂窝结构相比，我们发现波纹管声学超材料结构具有更强的抗冲击能力和吸能能力。在低速冲击下，增加层高可进一步提高其力学性能。此外，折纸折纸芯的基体材料可以定制，以适应各种应用场景。这种新型声学超材料结构有望应用于交通、土木、机械和航空航天工程的噪声控制。Auxetic Pattern Design for Concentric-tube Robots Using an Active DNN-Metaheuristics OptimizationJieun Park, Jeong Min Hur, Soyeon Park, Do-Nyun Kim, Gunwoo Nohdoi:10.1016/j.tws.2024.111603基于主动dnn -元启发式优化的同心管机器人辅助图案设计We optimized the design parameters of three auxetic patterns to minimize the bending stiffness-to-torsional stiffness ratios (EI/GJ) in concentric-tube robots while maintaining minimal compliance. We proposed a deep neural network-based metaheuristics optimization framework that incorporates active data generation close to the Pareto front and retraining of the surrogate model. Iterative procedure of data generation and surrogate model retraining yielded improved optimal solutions due to enhanced prediction accuracy of the surrogate model near the Pareto front, with minimal added data. The auxetic patterns optimized using our method achieved lower EI/GJ values compared to the recently reported design with identical tube specifications.为了在保持最小柔度的同时最小化同心管机器人的弯曲刚度/扭转刚度比(EI/GJ)，我们对三种辅助模式的设计参数进行了优化。我们提出了一个基于深度神经网络的元启发式优化框架，该框架结合了接近帕累托前沿的主动数据生成和代理模型的再训练。数据生成和代理模型再训练的迭代过程得到了改进的最优解，因为代理模型在Pareto前沿附近的预测精度提高了，并且添加的数据最少。与最近报道的具有相同管规格的设计相比，使用我们的方法优化的消声模式获得了更低的EI/GJ值。Partially self-centering braces with NiTi- and Fe-SMA U-shaped dampersShuling Hu, M. Shahria Alam, Yuelin Zhang, Zhenghao Ding, Xiuzhang Hedoi:10.1016/j.tws.2024.111605部分自定心支架与NiTi和Fe-SMA u形阻尼器Partially self-centering behavior has been considered a promising and beneficial solution for achieving seismic resilience of building structures in the life-cycle span. This paper aims to develop an innovative partially self-centering brace (PSB) with NiTi-based shape memory alloy (NiTi-SMA) and iron-based shape memory alloy (Fe-SMA) U-shaped dampers. NiTi-SMA and Fe-SMA U-shaped dampers are the main nonlinear components and provide self-centering and energy-absorbing capacities, respectively. The PSB's self-centering capability can be flexibly controlled by adjusting the contribution of NiTi-SMA and Fe-SMA U-shaped dampers. The working principle, desired nonlinear behaviors, and preliminary design methods of PSBs were first introduced. This is followed by parametric 3D numerical simulations of PSBs, where the efficiency of the modeling of NiTi-SMA and Fe-SMA U-shaped dampers was verified based on test results. The cyclic loading results indicate that only U-shaped dampers developed nonlinear behavior and other components can maintain elastic, and the designed PSB can achieve the desired partial self-centering behavior with simple construction. Parametric analysis outcomes illustrate that an increased contribution of Fe-SMA U-shaped dampers could reduce the self-centering capacity while enhancing the hysteretic energy-dissipation capacity and maximum loading capacities of PSBs. Evaluating the seismic performance of structures with PSBs involved parametric dynamic analyses of single-degree-of-freedom systems. These analyses revealed that in comparison to fully self-centering systems, partially self-centering systems featuring PSBs could achieve lower force requirements, diminished absolute acceleration responses, and acceptable residual deformations, all while being designed to achieve the same maximum deformations. The analysis results affirm the potential of the proposed PSB as a promising lateral force-resisting element for augmenting the life-cycle advantages of self-centering building structures by striking a balance between initial construction expenses, structural damage control, and nonstructural damage control.部分自定心行为被认为是实现建筑结构全寿命抗震性能的一种有前途和有益的解决方案。本文旨在开发一种新型的部分自定心支撑(PSB)，该支撑采用镍基形状记忆合金(NiTi-SMA)和铁基形状记忆合金(Fe-SMA) u型阻尼器。NiTi-SMA和Fe-SMA u型阻尼器是主要的非线性部件，分别提供自定心和吸能能力。通过调整nti - sma和Fe-SMA u型阻尼器的贡献，可以灵活地控制PSB的自定心能力。首先介绍了psb的工作原理、期望的非线性行为和初步设计方法。随后对psb进行了参数化三维数值模拟，并根据试验结果验证了NiTi-SMA和Fe-SMA u型阻尼器建模的有效性。循环加载结果表明，只有u型阻尼器表现出非线性行为，其他部件均保持弹性，所设计的PSB结构简单，能达到预期的部分自定心性能。参数分析结果表明，增加Fe-SMA u型阻尼器的贡献可以降低psb的自定心能力，同时提高psb的滞回耗能能力和最大承载能力。评价带psb结构的抗震性能涉及单自由度体系的参数动力分析。这些分析表明，与完全自定心系统相比，具有psb的部分自定心系统可以实现更低的力要求，减少绝对加速度响应，并可以接受残余变形，同时实现相同的最大变形。分析结果肯定了所提出的PSB作为一种有希望的横向抗力元件的潜力，通过在初始施工费用、结构损伤控制和非结构损伤控制之间取得平衡，增加自定心建筑结构的生命周期优势。来源：复合材料力学仿真Composites FEM