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A DAMAGE MODEL OF LIFE PREDICTION UNDERCREEPFATIGUE INTERACTION

Author N. Wang , B.S. Zhou , Z.D. Wang and D.D. Wu College of Mechanical Engineering , East China University of Science and Technology , Shanghai 200237 , ChinaManuscript received 18 October 1998

金属学报(英文版)

Based on the fundamental definition of damage and inelastic strain energy hypothesis, this paper presents an inelastic strain energy damage model under creepfatigue interaction condition, with the damage constitutional equations and life prediction formulae respectively described by strain and stress. Creepfatigue tests with notchedbar specimens were carried out at 550. The actual creepfatigue lives are in good agreement to the predicted lives according to inelastic strain energy damage model.

关键词: damage mechanics , null , null , null

A DCPD TECHNIQUE FOR LOCALIZED CREEP DAMAGE IN NOTCHED BARS

Z.D. Wang , Y. Qiao , B.S. Zhou and D.O. Wu (College of Mechanical Engineering , East China University of Science & Technology , Shanghai 200237 , China)

金属学报(英文版)

Localized creep damage in a notched round specimen has been investigated in this paper based on the creep damage mechanics and the DCPD technique. Expressions of creep damage equivalent stress under multi-axial state are given to describe the validity for localized damage in ductile materials. A DCPD method is introduced into the measurement of local creep damage near the tip of V-type notch of round bar. The technique with instrument configuration, selection of probe position and measuring calibration is also presented in the paper. Some results of creep damage estimation are shown on 2.25Cr-1Mo at 550℃.

关键词: creep damage mechanics , null , null

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