Abstract
Micromechanical analyses are presented of matrix fracture and fibre-matrix debonding in carbon-epoxy composites. The fibres and the matrix are connected by special interface elements which allow for a geometric discontinuity (debonding) to arise. Two different models for the fibres and the matrix of the composite structure are used: firstly an elasto-plastic Cosserat continuum and secondly a visco-plastic continuum. In the micro-mechanical analyses of matrix fracture it is demonstrated that, upon mesh-refinement, the load deflection curves converge to a unique solution when these regularised continua are applied, and that the width of the localisation band remains finite. When the interaction between matrix cracking and debonding is investigated the same observations hold.
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