Fatigue crack initiation and propagation of a TiNi shape memory alloy

SCRIPTA MATERIALIA

卷:62

Article

Gloanec, A. -L.¹  Cerracchio, P.¹  Reynier, B.¹  Van Herpen, A.¹  Riberty, P.¹ 

[1] UMEIMS ENSTA Paristech, F-75732 Paris 15, France

关键词: Low cycle fatigue;    Pseudoelastic behavior;    Fatigue crack initiation;    Fatigue crack propagation;    Dissipated energy;   

DOI  :  10.1016/j.scriptamat.2010.02.001

来源: Elsevier

【 摘 要 】

In this paper, fatigue crack initiation and the propagation stages of a TiNi shape memory alloy are examined using a low cycle fatigue interrupted test. Submitted to fatigue cyclic loading, the response of the alloy presents a classical pseudoelastic response. Two potential initiation crack areas are highlighted: at the phase interfaces and at the grain boundaries. Propagation results from the coalescence of many microscopic cracks. These two stages are detectable in the last 20% of the total fatigue life. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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