FATIGUE CRACK INITIATION AND PROPAGATION OF A TiNi SHAPE MEMORY ALLOY

Anne-Lise Gloanec (1) , Priscillia Cerrachio (1) , Bertrand Reynier (1) , Alain van Herpen (1) , Patrice Riberty (1)

1 MS - Matériaux et Structures

Fatigue crack initiation and propagation stages of a TiNi shape memory alloy are examined thanks to 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 or at the grain boundaries. Then, propagation results from the coalescence of many microscopic cracks. These two stages are detectable at the last 20% of the total fatigue life.

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

Domains: Engineering Sciences [physics]; Materials; Engineering Sciences [physics]; Mechanics [physics.med-ph]; Mechanics of materials [physics.class-ph]; Physics [physics]; Mechanics [physics]; Mechanics of materials [physics.class-ph]; Engineering Sciences [physics]; Mechanics [physics.med-ph]; Materials and structures in mechanics [physics.class-ph]; Physics [physics]; Mechanics [physics]; Materials and structures in mechanics [physics.class-ph]

Anne-Lise Gloanec, Priscillia Cerrachio, Bertrand Reynier, Alain van Herpen, Patrice Riberty. FATIGUE CRACK INITIATION AND PROPAGATION OF A TiNi SHAPE MEMORY ALLOY. Scripta Materialia, 2010, volume 62, pp.786-789. ⟨10.1016/j.scriptamat.2010.02.001⟩. ⟨hal-00660662⟩