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Nonlinear viscoelastic and viscoplastic constitutive equations with growing damage

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Abstract

Nonequilibrium thermodynamics, rate-process theory, viscoelastic fracture mechanics and various experimentally-motivated simplifications are used to develop constitutive equations that account for effects of viscoelasticity, viscoplasticity, growing damage and aging. Their form is more general than previously developed by the author, and allows for relatively general tensorial effects of damage. Some important special cases are then covered, with emphasis on viscoelasticity. Evolution equations for the damage expressed in terms of internal state variables (ISVs) are discussed, comparing formulations using scalar ISVs and tensor ISVs. Finally, some experimental support for the theory is described. An Appendix illustrates the theory for an aging, linear viscoelastic material with growing cracks.

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Authors and Affiliations

  1. Department of Aerospace Engineering and Engineering Mechanics, The University of Texas, Austin, Texas, 78712, U.S.A.

    R.A. Schapery

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Schapery, R. Nonlinear viscoelastic and viscoplastic constitutive equations with growing damage. International Journal of Fracture 97, 33–66 (1999). https://doi.org/10.1023/A:1018695329398

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