On the formation of martensite in front of cracks in pseudoelastic shape memory alloys

X. M. WANG; Y. F. WANG; A. BARUJ; G. EGGELER; Z. F. YUE

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Elsevier

Lugar: Amsterdam; Año: 2005 vol. 394 p. 393 - 398

0921-5093

In the present study we use finite element stress and strain analysis to study the stress induced martensitic transformations near the crack tip of compact tension (CT) specimens of pseudoelastic NiTi shape memory alloys. For this purpose, Aurichio’s model for pseudoelasticity was implemented into the finite element code ABAQUS. The material parameters required in the model were adjusted according to loading/unloading data from pull-pull tests on pseudoelastic NiTi wires. Stress induced martensite forms near the notch of a CT specimen with no pre-crack. But the presence of a sharp pre-crack alters the results considerably. The results presented in the present paper provide some guidance for the interpretation of fracture mechanics tests on pseudoelastic shape memory alloys.