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Fracture of notched round-bar NiTi-specimens
- Source :
-
Engineering Fracture Mechanics . Apr2012, Vol. 84, p1-14. 14p. - Publication Year :
- 2012
-
Abstract
- Abstract: In this work fractography has been used to characterize the fracture surfaces of superelastic, notched round-bar NiTi-specimens. Several fractography studies have been performed for conventional materials, but only few studies have been conducted on NiTi-alloys. The aim of this work is to investigate the effect of semi-circular notches on the fracture behavior of NiTi. The main results indicate that the fracture process is a mixture of cleavage and micro-void coalescence, and that decreasing the notch-radius leads to a loss of ductility which manifests in a reduced fracture strain. Within the range of notches studied in this work, we can observe a transition from high scatter to low scatter in the fracture strain when reducing the notch-radius. By combining fractography studies, finite element analyses and the Rice–Tracey void-growth model, it is argued that fracture is most likely initiated close to the notch for all notch-radii studied herein, and that cleavage or quasi cleavage is the dominating fracture mechanism. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00137944
- Volume :
- 84
- Database :
- Academic Search Index
- Journal :
- Engineering Fracture Mechanics
- Publication Type :
- Academic Journal
- Accession number :
- 73570016
- Full Text :
- https://doi.org/10.1016/j.engfracmech.2011.12.007