Dynamic fracture surface energy values and branching instabilities during rapid crack propagation in rubber toughened PMMA |
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| Affiliation: | 1. Dipartimento di Scienze Statistiche, “Sapienza” Università di Roma, Rome, Italy;2. Institute for Climate and Atmospheric Science, University of Leeds, Leeds, UK;3. Center for Research and Development in Mathematics and Applications (CIDMA), Department of Mathematics, University of Aveiro, Aveiro 3810-193, Portugal |
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| Abstract: | An experimental device based on strip band geometry has been designed to explore the brittle behaviour of polymers during rapid crack propagation. The macroscopic crack speed is found to be quasi-constant along an entire RT-PMMA specimen, even in the case of crack branching and until arrest, if any. At the macroscopic branching velocity, the experimental fracture surface energy and the fracture surface roughness have no single values in RT-PMMA. In fact, the macroscopic fracture surface energy increases with the number of instabilities or frustrated micro-branches. |
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