FATIGUE CRACK INITIATION AND PROPAGATION OF A TiNi SHAPE MEMORY ALLOYReport as inadecuate




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1 ENSTA ParisTech UME-MS - Matériaux et Structures

Abstract : 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





Author: Anne-Lise Gloanec - Priscillia Cerrachio - Bertrand Reynier - Alain Van Herpen - Patrice Riberty -

Source: https://hal.archives-ouvertes.fr/



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