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Title: The influence of plasticity-induced crack closure on creep-fatigue crack growth in two heat-resistant steels

Journal Article · · International Journal of Fatigue
 [1];  [1];  [1];  [2];  [1];  [1];  [2]
  1. Univ. of Idaho, Moscow, ID (United States). Dept. of Mechanical Engineering
  2. Univ. of Idaho, Moscow, ID (United States). Dept. of Chemical and Materials Engineering

Finite element simulations are performed to predict plasticity-induced crack closure and creep-fatigue crack growth rates in two heat-resistant steels, the austenitic 20Cr-25Ni (Alloy 709) and martensitic 9Cr-1Mo (modified 1Cr-9Mo) steels. In a creep-fatigue cycle, total crack growth rate is usually computed by the addition of the fatigue crack growth rate during cyclic loading and creep crack growth rate during hold time. Two-dimensional finite element analyses of compact tension specimens are performed to simulate crack growth under cyclic and time-dependent loading conditions, with the consideration of elastic-plastic and creep deformations of the material at the crack tip. The simulations quantify the effect of hold time on crack opening load induced by the combined action of plasticity-induced crack closure and creep-induced stress relaxation at the crack tip. It is shown that increasing hold time during a creep-fatigue cycle results in a decrease of crack-tip opening load, thus increasing crack growth rate during the next cyclic loading. Experimental results of creep-fatigue crack growth rates in Alloy 709 are presented. The finite element simulations predicted crack growth rates under creep-fatigue loading in agreement with experimental values for both Alloy 709 and modified 9Cr-1Mo steels.

Research Organization:
Univ. of Idaho, Moscow, ID (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
NE0008443
OSTI ID:
1505377
Alternate ID(s):
OSTI ID: 1547542
Report Number(s):
15-8623; 15-8623
Journal Information:
International Journal of Fatigue, Vol. 125; ISSN 0142-1123
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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Cited By (1)

Fatigue and creep-fatigue crack growth in alloy 709 at elevated temperatures journal September 2019