On the driving force for crack growth during thermal actuation of shape memory alloys

被引：36

作者：

Baxevanis, T. ^{[1
]}

Parrinello, A. F. ^{[1
,3
]}

Lagoudas, D. C. ^{[1
,2
]}

机构：

[1] Texas A&M Univ, Dept Aerosp Engn, College Stn, TX 77843 USA

[2] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA

[3] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England

来源：

JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS | 2016年 / 89卷

基金：

美国国家科学基金会;

关键词：

Shape Memory Alloys; Actuation; Phase transformation; Fracture toughness; Finite elements; FRACTURE TOUGHENING MECHANISM; FATIGUE; TRANSFORMATION; EVOLUTION; BEHAVIOR; STRAIN; MODEL; TIP;

D O I：

10.1016/j.jmps.2015.12.011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of thermomechanically induced phase transformation on the driving force for crack growth in polycrystalline shape memory alloys is analyzed in an infinite center cracked plate subjected to a thermal actuation cycle under mechanical load in plain strain. Finite element calculations are carried out to determine the mechanical fields near the static crack and the crack-tip energy release rate using the virtual crack closure technique. A substantial increase of the energy release rate - an order of magnitude for some material systems - is observed during the thermal cycle due to the stress redistribution induced by large scale phase transformation. Thus, phase transformation occurring due to thermal variations under mechanical load may result in crack growth if the crack-tip energy release rate reaches a material specific critical value. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：255 / 271

页数：17

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