Luders-like band front motion and fatigue life of pseudoelastic polycrystalline NiTi shape memory alloy

被引：45
作者：
Zheng, Lin [1 ]
He, Yongjun [1 ]
Moumni, Ziad [1 ,2 ]
机构：
[1] Univ Paris Saclay, ENSTA ParisTech, CNRS, IMSIA,CEA,EDF, 828 Blvd Marechaux, F-91120 Palaiseau, France
[2] Northwestern Polytech Univ, Engn Simulat & Aerosp Comp, Xian 710072, Peoples R China
来源：
SCRIPTA MATERIALIA | 2016年 / 123卷
关键词：
Fatigue; Shape memory alloys; Shear bands (localized deformation); Martensitic phase transformation; Superelasticity; INDUCED MARTENSITIC-TRANSFORMATION; LOW-CYCLE FATIGUE; PHASE-TRANSFORMATION; DEFORMATION; HYSTERESIS; BEHAVIOR; FAILURE; DEVICES; DOMAIN; WIRE;
D O I：
10.1016/j.scriptamat.2016.05.042
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We conducted tensile fatigue tests on polycrystalline NiTi strips with in-situ optical observation on the evolution of the localized deformation (Luders-like band) in order to trace the deformation history of the fatigue-failure material point in the strips under various loadings. It is found that the band front motion triggering localized cyclic phase transformation leads to a short fatigue life while the "elastic" deformation (without the band front motion) results in a much longer life whose failure crack nucleates away from the immobile band front. The results provide hints to derive a material fatigue criterion from the structure fatigue tests. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：46 / 50
页数：5
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