ISSN: 1945-7553
Page Count: 2

Measurement of Fatigue-Creep Dynamic Back Stress and Strain Rate Equation of a Fe-Ni-Cr Alloy

He, Q
Northern Jiaotong University, Beijing,

Chen, G
University of Science and Technology Beijing, Beijing,

Zhang, S
University of Science and Technology Beijing, Beijing,

(Received 18 September 1997; accepted 9 June 1998)

Abstract

A new testing method for measurement of dynamic back stress for fatigue-creep interaction with predominant creep at high mean stress is developed according to the principle of dropped stress creep. A series of dropped stress creep tests were performed repeatedly until an unlimited extensive incubation with zero creep rate at a given dropped stress occurred. The stress causing zero creep rate is defined as fatigue-creep dynamic back stress. The developed method was used successfully to measure the dynamic back stress for fatigue-creep interaction with predominant creep. The dynamic effective stress could yield a better description of the strain rate equation for the fatigue-creep interaction at high mean stress. Mean stress plays a predominant role in determining fatigue-creep strain rate.

Keywords:
fatigue-creep interaction, high mean stress, dynamic back stress

Paper ID: JTE12120J
DOI: 10.1520/JTE12120J
ASTM International is a member of CrossRef.