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

Abstract

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.

Authors:
 [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
Publication Date:
Research Org.:
Univ. of Idaho, Moscow, ID (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1505377
Report Number(s):
15-8623
Journal ID: ISSN 0142-1123; 15-8623
Grant/Contract Number:  
NE0008443
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Fatigue
Additional Journal Information:
Journal Name: International Journal of Fatigue; Journal ID: ISSN 0142-1123
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; plasticity-induced crack closure; creep-fatigue; crack growth; Alloy 709; 9Cr-1Mo steel.

Citation Formats

Ramirez, J., Potirniche, G. P., Shaber, N., Taylor, M., Pugesek, H., Stephens, R., and Charit, I.. The influence of plasticity-induced crack closure on creep-fatigue crack growth in two heat-resistant steels. United States: N. p., 2019. Web. doi:10.1016/j.ijfatigue.2019.04.007.
Ramirez, J., Potirniche, G. P., Shaber, N., Taylor, M., Pugesek, H., Stephens, R., & Charit, I.. The influence of plasticity-induced crack closure on creep-fatigue crack growth in two heat-resistant steels. United States. doi:10.1016/j.ijfatigue.2019.04.007.
Ramirez, J., Potirniche, G. P., Shaber, N., Taylor, M., Pugesek, H., Stephens, R., and Charit, I.. Fri . "The influence of plasticity-induced crack closure on creep-fatigue crack growth in two heat-resistant steels". United States. doi:10.1016/j.ijfatigue.2019.04.007.
@article{osti_1505377,
title = {The influence of plasticity-induced crack closure on creep-fatigue crack growth in two heat-resistant steels},
author = {Ramirez, J. and Potirniche, G. P. and Shaber, N. and Taylor, M. and Pugesek, H. and Stephens, R. and Charit, I.},
abstractNote = {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.},
doi = {10.1016/j.ijfatigue.2019.04.007},
journal = {International Journal of Fatigue},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {4}
}

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This content will become publicly available on April 5, 2020
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