Uncovering the dynamic fracture behavior of PMMA
| Autor: | Bobaru, Florin, Wang, Longzhen, Mehrmashhadi, Javad |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
engrXiv|Engineering|Mechanical Engineering|Computer-Aided Engineering and Design
engrXiv|Engineering bepress|Engineering bepress|Engineering|Mechanical Engineering engrXiv|Engineering|Mechanical Engineering bepress|Engineering|Mechanical Engineering|Applied Mechanics bepress|Engineering|Mechanical Engineering|Computer-Aided Engineering and Design engrXiv|Engineering|Mechanical Engineering|Applied Mechanics |
| DOI: | 10.31224/osf.io/46p9q |
| Popis: | Experimental investigations of dynamic crack propagation in PMMA induced by impact show single cracks running at around 300-400 m/s. Existing numerical models for simulating dynamic fracture in PMMA consistently produce crack propagation speeds significantly higher than those measured experimentally. Here we uncover the reason for this puzzle by showing that localized softening in the fracture process zone (caused by heating due to high strain rates in front of the crack tip), leads to crack propagation speeds that match the observed ones. We introduce a new constitutive model in our peridynamic formulation for PMMA to account for material softening in the crack tip region. With the new model, the computed crack speed and crack length evolution match very closely those found experimentally. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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