Plastic Energy Dissipation Model for Lifetime Prediction of Zirconium and Zircaloy-4 Fatigued at RT and 400°C

[+] Author and Article Information
Xiao Lin, Gu Haicheng

State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, Peoples’ Republic of China

J. Eng. Mater. Technol 120(2), 114-118 (Apr 01, 1998) (5 pages) doi:10.1115/1.2806998 History: Received January 12, 1997; Revised November 13, 1997; Online November 27, 2007


Low cycle fatigue properties of zirconium and zircaloy-4 were investigated at RT and 400°C. The microscopic structure was determined using scanning electron microscopy and transmission electron microscopy techniques. On the basis of analyses of fatigue damage mechanism, it is believed that fatigue is an irreversible energy dissipation process. Thus, the plastic dissipation energy per cycle is selected as a fatigue damage variable. The accumulated plastic dissipation energy is calculated at the condition of considering cyclic hardening, saturation and softening characters of zirconium and zircaloy-4 during cycling. The testing results show that there present a power law between the plastic dissipation energy and fatigue lifetime.

Copyright © 1998 by The American Society of Mechanical Engineers
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