Fracture Toughness of Shape Memory Alloy Actuators: Effect of Transformation-Induced Plasticity

被引：1

作者：

Jape, Sameer ^{[1
]}

Solomou, Alexandros ^{[2
]}

Baxevanis, Theocharis ^{[1
]}

Lagoudas, Dimitris C. ^{[1
,3
]}

机构：

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

[2] Univ Patras, Dept Mech Engn, Panepistimioupoli Patron 26504, Greece

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

来源：

BEHAVIOR AND MECHANICS OF MULTIFUNCTIONAL MATERIALS AND COMPOSITES 2016 | 2016年 / 9800卷

基金：

美国国家科学基金会;

关键词：

shape memory alloys; crack growth; transformation induced plasticity (TRIP); actuation; virtual crack closure technique; fracture; MARTENSITE-TRANSFORMATION; TOUGHENING MECHANISM; NITINOL; MODEL;

D O I：

10.1117/12.2219495

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Numerical analysis of static cracks in a plane strain center-cracked infinite medium shape memory alloy (SMA) panel subjected to cyclic thermal variations and a constant mechanical load is conducted using the finite element method. In solid-state SMA actuators, permanent changes in the material's microstructure in the form of dislocations are caused during cyclic thermomechanical loading, leading to macroscopic irreversible strains, known as transformation induced plastic (TRIP) strains. The influence of these accumulated TRIP strains on mechanical fields close to the crack tip is investigated in the present paper. Virtual crack growth technique (VCCT) in ABAQUS FEA suite is employed to calculate the crack tip energy release rate and crack is assumed to be stationary (or static) so that the crack tip energy release rate never reaches the material specific critical value. Increase in the crack tip energy release rate is observed during cooling and its relationship with accumulation of TRIP due to cyclic transformation is studied.

引用

页数：10

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