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

Journal Article · · International Journal of Fatigue
 [1];  [2];  [2];  [3];  [2];  [2];  [3]
  1. Univ. of Idaho, Moscow, ID (United States). Dept. of Mechanical Engineering; University of Idaho, Moscow, ID.
  2. Univ. of Idaho, Moscow, ID (United States). Dept. of Mechanical Engineering
  3. 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; 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, Journal Name: International Journal of Fatigue Vol. 125; ISSN 0142-1123
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

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

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