Effects of peak stress and stress amplitude on multiaxial transformation ratchetting and fatigue life of superelastic NiTi SMA micro-tubes: Experiments and life-prediction model

被引：28

作者：

Song, Di ^{[1
]}

Kang, Guozheng ^{[2
,3
]}

Kan, Qianhua ^{[2
,3
]}

Yu, Chao ^{[3
]}

Zhang, Chuanzeng ^{[4
]}

机构：

[1] Univ Elect Sci & Technol China, Sch Mechatron Engn, Chengdu 611731, Sichuan, Peoples R China

[2] Southwest Jiaotong Univ, State Key Lab Tract Power, Chengdu 610031, Sichuan, Peoples R China

[3] Southwest Jiaotong Univ, Sch Mech & Engn, Chengdu 610031, Sichuan, Peoples R China

[4] Univ Siegen, Dept Civil Engn, D-57068 Siegen, Germany

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2017年 / 96卷

基金：

中国国家自然科学基金;

关键词：

NiTi SMAs; Super-elasticity; Non-proportional loadings; Multiaxial fatigue; Life-prediction model; SHAPE-MEMORY ALLOYS; FAILURE; DEFORMATION;

D O I：

10.1016/j.ijfatigue.2016.12.006

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Multiaxial whole-life transformation ratchetting and fatigue failure of superelastic NiTi SMA micro-tubes are observed in the non-proportionally multiaxial stress-controlled cyclic tests at the human-body temperature (310 K) under five different multiaxial loading paths. The effects of the axial peak stress and stress amplitude on the transformation ratchetting and fatigue life are addressed. It is found that the super-elastic NiTi SMA micro-tubes sustain more significant path-dependent fatigue failure in the multiaxial cyclic tests with lower axial peak stress and stress amplitude, while the fatigue lives of the NiTi micro-tubes under different loading paths are gradually converged with the increasing axial peak stress and stress amplitude. Based on the experimental findings, a fatigue failure model is proposed to predict the multiaxial fatigue life of the super-elastic NiTi SMA micro-tubes by considering the initial/saturated dissipation energy and the non-proportionality of the loading paths. It is shown that the predicted multiaxial fatigue lives agree with the experimental ones fairly well. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：252 / 260

页数：9

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