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Materials and Fabrication

Constitutive Modeling of Multistage Creep Damage in Isotropic and Transversely Isotropic Alloys With Elastic Damage

[+] Author and Article Information
Calvin M. Stewart, Ali P. Gordon

Department of Mechanical, Materials and Aerospace Engineering,  University of Central Florida Orlando, FL 32816-2450

J. Pressure Vessel Technol 134(4), 041401 (Jul 30, 2012) (8 pages) doi:10.1115/1.4005946 History: Received August 23, 2011; Revised January 09, 2012; Published July 30, 2012; Online July 30, 2012

In the pressure vessel and piping and power industries, creep deformation has continued to be an important design consideration. Directionally solidified components have become commonplace. Creep deformation and damage is a common source of component failure. A considerable effort has gone into the study and development of constitutive models to account for such behavior. Creep deformation can be separated into three distinct regimes: primary, secondary, and tertiary. Most creep damage constitutive models are designed to model only one or two of these regimes. In this paper, a multistage creep damage constitutive model is developed and designed to model all three regimes of creep for isotropic materials. A rupture and critical damage prediction method follows. This constitutive model is then extended for transversely isotropic materials. In all cases, the influence of creep damage on general elasticity (elastic damage) is included. Methods to determine material constants from experimental data are detailed. Finally, the isotropic material model is exercised on tough pitch copper tube and the anisotropic model on a Ni-based superalloy.

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Copyright © 2012 by American Society of Mechanical Engineers
Topics: Creep
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Figures

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Figure 1

Creep deformation

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Figure 2

Creep deformation of tough pitch copper tube: (a) primary and secondary regimes and (b) all regimes

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Figure 3

Damage evolution of tough pitch copper tube: (a) damage and (b) Young’s moduli

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Figure 4

Creep deformation of DS Ni-based superalloy: (a) primary and secondary regimes and (b) all regimes

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Figure 5

Damage evolution of DS Ni-based superalloy

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