A closure model for predicting crack growth under creep-fatigue loading

Potirniche, Gabriel P.

doi:10.1016/j.ijfatigue.2019.03.029

A closure model for predicting crack growth under creep-fatigue loading

Journal Article · Wed Mar 20 04:00:00 EDT 2019 · International Journal of Fatigue

DOI:https://doi.org/10.1016/j.ijfatigue.2019.03.029· OSTI ID:1502740

Potirniche, Gabriel P. ^[1]

Univ. of Idaho, Moscow, ID (United States). Mechanical Engineering Dept.; University of Idaho

A strip-yield model was formulated here to simulate creep-fatigue crack growth and to quantify the influence of hold time on plasticity-induced crack closure during creep-fatigue crack growth. Creep-fatigue experiments have shown that longer creep hold times result in faster crack growth rates in subsequent fatigue cycles. This model advances the idea that a decrease of plasticity-induced crack closure is experienced by the crack during fatigue loading when a longer hold time is applied each creep-fatigue cycle. Consequently, the crack tip experiences an increase in the effective stress intensity factor range causing faster growth rate during the fatigue loading. The weight function method was used to compute stress intensity factors and surface displacements for cracks embedded in a material experiencing elastic, plastic and creep deformations at elevated temperatures. It is shown that the longer the hold time, the larger the creep deformation and crack opening displacements in the near crack-tip region. In turn, this leads to a decrease in the crack-tip opening stress/load and faster crack growth rates during the subsequent fatigue cycle. The model was used to perform simulations of creep-fatigue crack growth at elevated temperatures in a nickel-base superalloy and AISI 316 austenitic steel.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Idaho, Moscow, ID (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: NE0008443

OSTI ID:: 1502740

Alternate ID(s):: OSTI ID: 1547613

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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42 ENGINEERING
austenitic 316 steel
creep fatigue
nickel base alloy
plasticity-induced crack closure
strip yield model

A closure model for predicting crack growth under creep-fatigue loading

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