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Proceedings Paper

An energy-based fatigue failure model for super-elastic NiTi alloys under pure mechanical cyclic loading
Author(s): Qianhua Kan; Guozheng Kang; Wenyi Yan; Yawei Dong; Chao Yu
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Paper Abstract

The fatigue failure of a super-elastic NiTi alloy was observed by uniaxial stress-controlled cyclic tests. During the cyclic loading a hysteresis loop with a varied but stabilized size after certain cycles was obtained, which is similar to plastic shakedown. The material exhibits unique brittle fracture with a large transformation strain. The fatigue life of the material greatly depends on the applied peak nominal stress, the nominal stress amplitude and the mean nominal stress. A relation between the dissipation energy at the stabilized stage of cyclic loading and the number of cycles at failure was derived from the experimental results. Based on the obtained experimental results, a uniaxial fatigue failure model based on the energy approach was proposed to predict the fatigue life. It was shown that the proposed model provides good predictions to the uniaxial fatigue lives of super-elastic NiTi alloys with different types of cyclic stressing.

Paper Details

Date Published: 2 April 2012
PDF: 8 pages
Proc. SPIE 8409, Third International Conference on Smart Materials and Nanotechnology in Engineering, 84090F (2 April 2012); doi: 10.1117/12.922148
Show Author Affiliations
Qianhua Kan, Southwest Jiaotong Univ. (China)
Guozheng Kang, Southwest Jiaotong Univ. (China)
Wenyi Yan, Monash Univ. (Australia)
Yawei Dong, Southwest Jiaotong Univ. (China)
Chao Yu, Southwest Jiaotong Univ. (China)

Published in SPIE Proceedings Vol. 8409:
Third International Conference on Smart Materials and Nanotechnology in Engineering
Jinsong Leng; Yoseph Bar-Cohen; In Lee; Jian Lu, Editor(s)

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