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Title: A basis for applying elastic perfectly-plastic design methods to cyclic softening materials

Abstract

Design approaches using elastic perfectly-plastic (EPP) analysis have recently been approved as Code Cases for the Section III, Division 5 design of high-temperature nuclear reactor components made from austenitic stainless steel. These methods bound the ratcheting strain and creep-fatigue damage accumulated over the life of a component with a simplified, elastic perfectly plastic analysis using a special pseudo-yield stress often not equal to the true material yield stress. The austenitic materials specified in the existing Code cases are cyclic-hardening for all allowable operating temperatures. However, other Section III, Division 5 materials, such as Grade 91 steel, are cyclic softening at expected advanced reactor operating temperatures. This work describes the extension of EPP methods to cyclic softening materials through the use of a postulated saturated material state and softening factors to be applied to the pseudo yield stress. We demonstrate the conservatism of the modified EPP method against a series of inelastic simulations of two bar tests, using a constitutive model that captures work and cyclic softening.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy
OSTI Identifier:
1510504
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: 2018 ASME Pressure Vessels and Piping Conference, 07/15/18 - 07/20/18, Prague, CZ
Country of Publication:
United States
Language:
English

Citation Formats

Messner, M. C., Wang, Yanli, Jetter, R. I., and Sham, T. -L. A basis for applying elastic perfectly-plastic design methods to cyclic softening materials. United States: N. p., 2019. Web. doi:10.1115/PVP2018-84103.
Messner, M. C., Wang, Yanli, Jetter, R. I., & Sham, T. -L. A basis for applying elastic perfectly-plastic design methods to cyclic softening materials. United States. doi:10.1115/PVP2018-84103.
Messner, M. C., Wang, Yanli, Jetter, R. I., and Sham, T. -L. Tue . "A basis for applying elastic perfectly-plastic design methods to cyclic softening materials". United States. doi:10.1115/PVP2018-84103.
@article{osti_1510504,
title = {A basis for applying elastic perfectly-plastic design methods to cyclic softening materials},
author = {Messner, M. C. and Wang, Yanli and Jetter, R. I. and Sham, T. -L.},
abstractNote = {Design approaches using elastic perfectly-plastic (EPP) analysis have recently been approved as Code Cases for the Section III, Division 5 design of high-temperature nuclear reactor components made from austenitic stainless steel. These methods bound the ratcheting strain and creep-fatigue damage accumulated over the life of a component with a simplified, elastic perfectly plastic analysis using a special pseudo-yield stress often not equal to the true material yield stress. The austenitic materials specified in the existing Code cases are cyclic-hardening for all allowable operating temperatures. However, other Section III, Division 5 materials, such as Grade 91 steel, are cyclic softening at expected advanced reactor operating temperatures. This work describes the extension of EPP methods to cyclic softening materials through the use of a postulated saturated material state and softening factors to be applied to the pseudo yield stress. We demonstrate the conservatism of the modified EPP method against a series of inelastic simulations of two bar tests, using a constitutive model that captures work and cyclic softening.},
doi = {10.1115/PVP2018-84103},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {1}
}

Conference:
Other availability
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