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Crack Initiation and Growth in a Notched NiTi Shape Memory Alloy Sheet

Published online by Cambridge University Press:  01 February 2011

Wei Tong ,
Hong Tao  and
Nian Zhang
Wei Tong
Affiliation:
Department of Mechanical Engineering, Yale University, New Haven, CT
Hong Tao
Affiliation:
Department of Mechanical Engineering, Yale University, New Haven, CT
Nian Zhang
Affiliation:
Department of Mechanical Engineering, Yale University, New Haven, CT
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Abstract

An experimental investigation was carried out to study the crack initiation and growth in a single-edge notched NiTi shape memory alloy sheet under tension. It is observed that a crack initiated at the tip of a V-shape notch before the peak axial load was reached and it grew steadily across the width of the NiTi sheet until final fracture. In-plane crack-tip deformation fields at various stages of the crack growth were measured based on an image correlation technique and the crack-tip opening displacement (CTOD) and crack-tip opening angle (CTOA) were subsequently determined. The fracture surface of the NiTi sheet was dimpled based on scanning electron microscopy examinations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 785: Symposium D – Materials and Devices for Smart Systems , 2003 , D7.7
Copyright
Copyright © Materials Research Society 2004

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References

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