Abstract
We formulate a macroscopic description of the mechanics of damaged materials. To represent the microstructure, the distribution of crack sizes is captured by way of the Minkowski functionals, or so-called quermass integrals, while a second-rank tensor is used to describe the average orientation of the cracks. A two phase-type approach is adopted to distinguish elastically strained material from unstrained regions in the wake of the cracks. Using nonequilibrium thermodynamic techniques, the driving force for the growth of the microcracks is naturally identified. In particular, Griffith’s law is generalized to assemblies of polydisperse crack sizes. Due to the detailed characterization of the microstructure, we are also able to account for the plastic zones at the rims of the cracks that are known to hamper the crack growth, and to discuss possible forms of the damage parameter. The presented approach separates in a transparent fashion the incorporation of fundamental thermodynamic and mechanic principles on one hand, from the specification of the material and details of the crack formation and growth on the other hand.
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Dedicated to Professor Wilhelm Schneider on the occasion of his 70th birthday
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Hütter, M., Tervoort, T.A. Continuum damage mechanics: combining thermodynamics with a thoughtful characterization of the microstructure. Acta Mech 201, 297–312 (2008). https://doi.org/10.1007/s00707-008-0064-0
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DOI: https://doi.org/10.1007/s00707-008-0064-0