Thermodynamic Damage Model for Compositeunder Severe Loading
Publication: Journal of Engineering Mechanics
Volume 126, Issue 10
Abstract
A damage model for a dynamically loaded composite structure under severe loading conditions is presented. The model is based on a thermodynamic micromechanic approach making use of the conservation laws and the first and second laws of thermodynamics. It makes use of an irreversible thermodynamic concept where damage is introduced as an internal variable. The model characterizes micromechanical damages in an average sense where three modes of damage for composites are used: tensile, shear, and interphase damage. A homogenization or an averaging technique is implemented to simplify the representation of the nonhomogeneous material. The composite materials are modeled as being inelastic where the Maxwell viscoelastic constitutive relation is incorporated. The initiation of microcracks in the continuum is predicted based on a dissipation function. The coalescing of these microcracks and the onset of macrocracks is modeled where the macrocracks are assumed to initiate when the computed power of dissipation reaches a critical value. Verification analysis and numerical results to demonstrate the model's damage characteristics are also presented.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 126 • Issue 10 • October 2000
Pages: 1001 - 1011
History
Received: May 14, 1999
Published online: Oct 1, 2000
Published in print: Oct 2000
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