Energy-based fatigue model for shape memory alloys including thermomechanical coupling

被引：29

作者：

Zhang, Yahui ^{[1
]}

Zhu, Jihong ^{[1
]}

Moumni, Ziad ^{[1
,2
]}

Van Herpen, Alain ^{[2
]}

Zhang, Weihong ^{[1
]}

机构：

[1] Northwestern Polytech Univ, ESAC, Xian 710072, Shaanxi, Peoples R China

[2] Univ Paris Saclay, IMSIA, UMR CNRS EDF CEA ENSTA 8193, 828 Blvd Marechaux, F-91762 Palaiseau, France

来源：

SMART MATERIALS AND STRUCTURES | 2016年 / 25卷 / 03期

基金：

中国国家自然科学基金;

关键词：

shape memory alloys; hysteresis energy; strain rate; thermomechanical coupling; fatigue criterion; STORED ENERGY; STRAIN-RATE; BEHAVIOR; DEFORMATION; WIRE; WORK;

D O I：

10.1088/0964-1726/25/3/035042

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

This paper is aimed at developing a low cycle fatigue criterion for pseudoelastic shape memory alloys to take into account thermomechanical coupling. To this end, fatigue tests are carried out at different loading rates under strain control at room temperature using NiTi wires. Temperature distribution on the specimen is measured using a high speed thermal camera. Specimens are tested to failure and fatigue lifetimes of specimens are measured. Test results show that the fatigue lifetime is greatly influenced by the loading rate: as the strain rate increases, the fatigue lifetime decreases. Furthermore, it is shown that the fatigue cracks initiate when the stored energy inside the material reaches a critical value. An energy-based fatigue criterion is thus proposed as a function of the irreversible hysteresis energy of the stabilized cycle and the loading rate. Fatigue life is calculated using the proposed model. The experimental and computational results compare well.

引用

页数：10

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