An internal damage model for viscoelastic-viscoplastic energetic materials

Matheson, E. R.; Drumheller, D. S.; Baer, M. R.
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p691
Academic Journal
A theoretical foundation constraining the forms of mechanical damage models for viscoelastic-viscoplastic energetic materials is developed. The theory is cast in terms of a viscoelastic-viscoplastic deviatoric stress tensor and a scalar viscoelastic-viscoplastic distention strain rate model. The constitutive forms of the deviatoric stress tensor and the distention strain rates are constrained by the second law of thermodynamics ensuring that the models will be dissipative. Additionally, a damage model is formulated that is driven by the mechanical response of the material and which modifies the constitutive models for the stress deviator and the distention strain rates. The models are implemented in the CTH shock physics code, and comparisons to test data are made.


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