A damage model with non-convex free energy for quasi-brittle materials

Authors

  • M. Franc¸ois

Abstract

A state coupling between the hydrostatic (volumetric) and deviatoric parts of the free energy is introduced in a damage mechanics model relevant for the quasi-brittle materials. It is shown that it describes the large dilatancy of concrete under compression and the different localization angles and damage levels in tension and compression. A simple isotropic description is used, although similar ideas can be extended to anisotropic damage. The model is identified with respect to tensile and compression tests and validated on bi-compression and bi-tension. Fully written in three dimensions under the framework of thermodynamics of irreversible processes, it allows further developments within a finite element code.

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Published

2019-07-30

How to Cite

Franc¸ois, M. (2019) “A damage model with non-convex free energy for quasi-brittle materials”, Technische Mechanik - European Journal of Engineering Mechanics, 30(1-3), pp. 110–121. Available at: https://journals.ub.ovgu.de/index.php/techmech/article/view/783 (Accessed: 6 November 2024).