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织物增强形状记忆复合材料大型空间可展桁架研究进展 被引量:6
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作者 高冀峰 房光强 +4 位作者 余兵 樊鹏玄 陈务军 赵兵 曹争利 《机械工程学报》 EI CAS CSCD 北大核心 2020年第5期80-92,共13页
围绕新型织物增强形状记忆复合材料空间可展桁架,总结了材料研制、结构制备、形状记忆行为、多尺度力学模型和地面试验的相关研究进展。可展桁架纵杆为织物增强复合材料制成的薄壁管,复合材料是将二维碳纤维织物添加到环氧形状记忆树脂... 围绕新型织物增强形状记忆复合材料空间可展桁架,总结了材料研制、结构制备、形状记忆行为、多尺度力学模型和地面试验的相关研究进展。可展桁架纵杆为织物增强复合材料制成的薄壁管,复合材料是将二维碳纤维织物添加到环氧形状记忆树脂中制备而成,通过调整基体树脂和固化剂的配比可控制材料的形状记忆性能。基于相变理论构建了形状记忆本构模型,并应用三点弯曲试验验证。通过微观、细观、宏观多尺度方法,计算了复合材料的均匀ABD刚度矩阵,依据Kirchhoff假设推导了薄壁管等效空间梁单元。搭建地面技术演示平台,验证形状记忆可展桁架单元收纳比达到50:1,形状恢复率约为100%。 展开更多
关键词 空间可展桁架 织物增强复合材料 形状记忆本构模型 ABD刚度矩阵 复合材料梁单元
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A macroscopic constitutive model of shape memory alloy considering cyclic effects 被引量:1
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作者 ZHOU Bo YOON Sung-Ho 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第4期755-764,共10页
This paper presents a macroscopic constitutive model reproducing the hysteretic behaviors of the superelastic shape memory alloy (SMA) under cyclic loading. The progressive increase of residual strain with the increas... This paper presents a macroscopic constitutive model reproducing the hysteretic behaviors of the superelastic shape memory alloy (SMA) under cyclic loading. The progressive increase of residual strain with the increased cycle number in such materials is assumed to be a consequence of the progressive increase of residual stress-induced martensitic volume fraction upon the cyclic effects. The progressive decrease of phase transformation critical stresses with the increased cycle number in such materials is assumed to be a result from the progressive increase of phase transformation critical temperatures upon the cyclic effects. A cyclic evolution equation is supposed to describe the influences of cycle effects on the material properties of the SMA under cyclic loading. A phase transformation equation expressing the phase transformation behaviors of the SMA under cyclic loading is established based on the differential relationship between martensitic volume fraction and the free energy increment of phase transformation. A mechanical constitutive equation predicting the mechanical characteristics of the SMA under cyclic loading is developed on the basis of thermodynamics and continuum mechanics. The cyclic evolution equation, phase transformation equation, and mechanical constitutive equation together compose the presented macroscopic constitutive model considering cyclic effects. Results of the numerical simulations illustrate that it can well reproduce the superelastic hysteretic behaviors of the SMA under cyclic loading. 展开更多
关键词 shape memory alloy cyclic effect cyclic evolution equation phase transformation equation mechanical constitutive equation
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Softening micromechanical constitutive model of stress induced martensite transformation for NiTi single crystal shape memory alloy 被引量:1
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作者 ZHU YiGuo ZHANG Yang ZHAO Dan 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第10期1946-1958,共13页
Based on the assumption of laminated microstructure, a micromechanical model of stress induced martensite transformation for NiTi shape memory alloys single crystal is proposed. Elasticity anisotropy and different pro... Based on the assumption of laminated microstructure, a micromechanical model of stress induced martensite transformation for NiTi shape memory alloys single crystal is proposed. Elasticity anisotropy and different proper-ties for two phases are considered. Martensite volume fraction is chosen as the internal variable that controls the phase transformation quantitatively. An effective macroscopic elasticity matrix based on the different elasticity characteristics of each phase and the martensite volume fraction are obtained with the help of the perfect interfa-cial relationships. A phase transformation driving force is derived to construct the transformation criterion. The model corresponds to a non-convexity free energy function during phase transformation, so softening behavior can be well simulated by the model. A numerical simulation is implemented for the uniaxial loading of NiTi single crystal alloy according to the model, and simulation results are proved by experimental results of polycrystal with strong {111} texture. Superelasticity, Anisotropy, the evolution of microstructure and softening behavior can be well simulated. 展开更多
关键词 shape memory alloys softening model laminated microstructures phase transformation
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