FATIGUE CRACK INITIATION AND PROPAGATION OF A TiNi SHAPE MEMORY ALLOY
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.
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]
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