期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 127, 期 -, 页码 295-331出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2019.03.015
关键词
Zero/negative thermal expansion; Shape memory alloy; Self-consistent homogenization scheme; Crystal plasticity; Martensite reorientation
资金
- Hong Kong Research Grant Council (GRF Project) [16209817]
- National Natural Science Foundation of China [11602203, 11532010]
- Young Elite Scientist Sponsorship by CAST [2016QNRC001]
- Fundamental Research Funds for Central Universities [2682018CX43]
Recent experimental investigation shows that macroscopic overall zero/negative thermal expansion (TE) can be obtained through the martensite reorientation of NiTiPd shape memory alloy (SMA). In this work, a microstructure-based theoretical model is established to quantify such phenomenon. Based on the crystallographic symmetry, the microstructures and the coefficients of thermal expansion of the austenite and martensite lattices of NiTiPd SMA are analyzed. A crystal plasticity-type constitutive model at the individual grain level is constructed to describe the martensite transformation (MT) and martensite reorientation (MR) processes, and the evolution of thermal expansion coefficient. The nonlinear constitutive model is linearized by adopting the implicit backward Euler time discretization scheme and an incremental affine stress-strain-temperature relationship is obtained. An incremental self-consistent homogenization scheme is proposed to describe the interaction among the grains and calculate the elastic, inelastic (MT and MR) and thermal deformations of the polycrystalline aggregates. The established model is used to simulate the MR and the resulting zero/negative TE of polycrystalline NiTiPd SMA. It is shown that the observed quantitative features in experiments can be captured reasonably by the model. (C) 2019 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据