A continuum damage mechanics (CDM) based Wilshire model for creep deformation, damage, and rupture prediction

Cano, Jaime A.; Stewart, Calvin M.

doi:10.1016/j.msea.2020.140231

A continuum damage mechanics (CDM) based Wilshire model for creep deformation, damage, and rupture prediction

Journal Article · Sun Sep 06 00:00:00 EDT 2020 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2020.140231· OSTI ID:1849212

Cano, Jaime A. ^[1]; Stewart, Calvin M. ^[2]

Univ. of Texas at El Paso, TX (United States). Dept. of Mechanical Engineering; Univ. of Texas at El Paso, TX (United States)
Univ. of Texas at El Paso, TX (United States). Dept. of Mechanical Engineering

In this report, a new constitutive model is derived that combines the Wilshire equations with continuum damage mechanics (CDM) to enable the long-term prediction of creep deformation, damage, and rupture. The Wilshire equations have been demonstrated to accurately extrapolate the stress-rupture, minimum-creep-strain-rate, and time-to-strain of various alloys across decade of life. Recently, the time-to-creep-strain equation has been rearranged to predict creep deformation curves; however, the resulting equation is difficult to calibrate and does not track damage. The CDM-based Sinh constitutive model accurately predicts creep deformation, damage, and stress-rupture for a variety of alloys; however, it lacks an explicit description of stress and temperature co-dependence which limits interpolation and extrapolation ability. In this study, the Wilshire and the CDM-based Sinh equations are combined to create the “WCS” model. The WCS model combines the best features of each model while eliminating their deficiencies. Experimental data for alloy P91 is gathered and the WCS model is calibrated to the data. The WCS model accurately predicts the stress rupture, minimum-creep-strain-rate, creep deformation, and damage of alloy P91 across the experimental stress and temperature range as well as consistency in parametric simulations.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Texas at El Paso, TX (United States)

Sponsoring Organization:: USDOE; USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0027581

OSTI ID:: 1849212

Alternate ID(s):: OSTI ID: 1668902

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Journal Issue: C Vol. 799; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Constitutive Model
Creep
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Interpolation
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Metallurgy & Metallurgical Engineering
Parametric Simulation
Science & Technology - Other Topics
Wilshire

A continuum damage mechanics (CDM) based Wilshire model for creep deformation, damage, and rupture prediction

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