Abstract
A constitutive model is developed to describe the mechanical behavior of a 3D stitched carbon/carbon composite subjected to complex multiaxial loadings. This model lies within the framework of Continuum Damage Mechanics (CDM) for the description of damage accumulation, and the approach to plasticity for the description of inelastic residual strains induced by the onset of damage. Microstructural observations of the various damage entities provide qualitative data allowing us to formulate physically based simplifying hypotheses. The evolution laws of scalar internal damage variables derived from the components of the compliance tensor are established within a classical thermodynamic framework, using coupled multicriteria expressed in the space of the associated thermodynamic forces. The various processes involved in the non-linear behavior observed under compressive loadings are introduced through the definition of an effective compliance tensor increment. Major advantages and drawbacks of the proposed approach as observed from various validation tests are discussed.
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