Microcracks tunneling in brittle matrix composites driven by thermal expansion mismatch |
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Affiliation: | 1. Department of Clinical Psychology and Experimental Psychopathology, University of Groningen, Groningen, the Netherlands;2. Centre for the Psychology of Learning and Experimental Psychopathology, KU Leuven, Leuven, Belgium;3. Department of Clinical Psychology, Utrecht University, Utrecht, the Netherlands;4. Laboratory of Experimental Psychology, Brain & Cognition Unit, KU Leuven, Belgium |
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Abstract: | During processing, brittle composites are susceptible to cracks caused by residual stress. Matrix cracks parallel to fibers are considered in this paper. Each crack initiates from a porosity, confined by the neighboring fibers, tunneling in the matrix. The analysis uses the concept of steady-state tunneling, which eliminates several analytical artifacts in a previous calculation. The cracking coefficient is computed for the full range of elastic mismatch and several fiber arrangements, and is presented in a form that can be used in selecting viable constituents. Calculations also demonstrate that fiber-matrix interface plays a major role in cracking. A sliding interface relaxes tunnel edges, and thereby the energy release rate at the tunnel front. |
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