| 计及相变微结构演化的形状记忆合金本构描述 |
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| 引用本文： | 李卫国,彭向和,方岱宁,皮文丽.计及相变微结构演化的形状记忆合金本构描述[J].固体力学学报,2007,28(3):255-260. |
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| 作者姓名： | 李卫国 彭向和 方岱宁 皮文丽 |
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| 作者单位： | 1. 清华大学航天航空学院,北京,100084
2. 重庆大学资源与环境科学学院,重庆,400044 |
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| 基金项目： | 国家自然科学基金
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教育部跨世纪优秀人才培养计划 |
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| 摘 要： | 基于对NiTi形状记忆合金的实验观察及有限元分析,考虑两相间的应变不协调关系,采用应变修正法建立了计及片层状微结构的本构模型,本模型考虑了两相间的相互约束,及其约束随微结构演化的变化规律.研究了NiTi形状记忆合金微圆管在拉伸和扭转下的响应特性.计算结果与实验结果的对比表明所建本构模型较好地描述了伪弹性响应尤其是较好地描述了拉伸实验过程中的应力跌落现象.
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| 关 键 词： | 形状记忆合金 伪弹性 片层状微结构 本构模型 |
| 修稿时间： | 2006-10-09 |
CONSTITUTIVE DESCRIPTION OF SHAPE MEMORY ALLOYS WITH PHASE TRANSFORMATION MICROSTRUCTURE EVOLUTION |
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| Li Weiguo,Peng Xianghe,Fang Daining,Pi Wenli.CONSTITUTIVE DESCRIPTION OF SHAPE MEMORY ALLOYS WITH PHASE TRANSFORMATION MICROSTRUCTURE EVOLUTION[J].Acta Mechnica Solida Sinica,2007,28(3):255-260. |
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| Authors: | Li Weiguo Peng Xianghe Fang Daining Pi Wenli |
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| Institution: | 1. School of Aerospace, Tsinghua University, Beijing, 100084;2. College of Resource and Environment Science, Chongqing University, Chongqing , 400044 |
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| Abstract: | Based on the experimental results and the finite element analysis,and taking into account laminar microstructure,the thickness of martenite phase and the interaction between the two phases,the incremental form of the constitutive model is proposed for two-phase shape memory alloys using the modified strain method.The pseudoelastisity of NiTi shape memory alloy microtube subjected to pure tension or pure torsion are analyzed and compared with the experimental results.It can be seen that the pseudoelastic behavior,especially the phenomena of a stress drop during tension processes can be well described with the proposed model. |
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| Keywords: | shape memory alloys pseudoelasticity laminar microstructure constitutive model |
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