多晶NiTi形状记忆合金相变的细观力学本构模型

doi:10.3724/SP.J.1037.2012.00319

金属学报

2013, Vol. 49

Issue (1): 123-128 DOI: 10.3724/SP.J.1037.2012.00319

论文

本期目录 | 过刊浏览

多晶NiTi形状记忆合金相变的细观力学本构模型

朱祎国^1,2,张杨^1,2,赵聃^1,2

1. 大连理工大学运载工程与力学学部工程力学系, 大连 116023

2. 大连理工大学工业装备结构分析国家重点实验室, 大连116023

MICROMECHANICAL CONSTITUTIVE MODEL FOR PHASE TRANSFORMATION OF NiTi POLYCRYSTAL SMA

ZHU Yiguo ^1,2, ZHANG Yang^1,2, ZHAO Dan^1,2

1. Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116023
2. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116023

引用本文:

朱祎国,张杨,赵聃. 多晶NiTi形状记忆合金相变的细观力学本构模型[J]. 金属学报, 2013, 49(1): 123-128.
ZHU Yiguo, ZHANG Yang, ZHAO Dan. MICROMECHANICAL CONSTITUTIVE MODEL FOR PHASE TRANSFORMATION OF NiTi POLYCRYSTAL SMA

[J]. Acta Metall Sin, 2013, 49(1): 123-128.

全文: PDF(663 KB)

摘要:

假设NiTi单晶在相变过程中具有层状的微观结构及理想的界面连续条件, 推导出各相微观量与宏观量之间的关系, 及相变驱动力的表达式, 建立了单晶相变的控制方程, 从而得到单晶的本构模型. 以此为基础, 利用Tayloy假设, 建立了NiTi多晶的本构模型. 通过控制应变进行加载, 数值模拟了恒温条件下具有{111}织构的NiTi合金的力学响应, 得到的应力-应变曲线与实验结果吻合较好. 利用模拟结果讨论了拉伸与压缩的不对称性、软化和温度对NiTi合金变形的影响.

关键词 ： NiTi多晶, 形状记忆合金, 相变, 超弹性, 本构模型

Abstract：

Shape memory alloys (SMAs) are new functional material featured by the excellent properties including shape memory effect and superelasticity. NiTi SMAs have some important implications in avitation, medical device,etc. The main objective of this work is to derive a simple Taylor model for NiTi polycrystal.By the assumption of laminated microstructure and perfect interfacial relationship for NiTi single crystal transformation, microscopic strain for each phase can be transformed to overall strain of respective volume element, and expression of phase transformation driving force is derived, then control equation of phase transformation is constructed. Based on the single crystal model, the NiTi polycrystal constitutive model is constructed by Taylor assumption. The model is used to simulate the mechanical response of NiTi polycrystal alloys with strong {111} texture, the results are in agreement with those observed experimentally. The predicted result of NiTi alloy with strong texture shows asymmetry of tension and compression. Simulation results behave softening as the free energy function is non-convex during phase transformation. Transformation stress level rises as temperature is raised.

Key words：

NiTi polycrystal shape memory alloy phase transformation pesudoelasticity constitutive model

收稿日期: 2012-05-31

基金资助:

国家自然科学基金项目10602011和10925209及教育部长江学者创新团队计划项目IRT1110资助

作者简介: 朱祎国, 男, 1972年生, 副教授, 博士

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链接本文:

https://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00319 或 https://www.ams.org.cn/CN/Y2013/V49/I1/123

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