Journal
OPTICS AND LASERS IN ENGINEERING
Volume 124, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2019.105849
Keywords
Dynamic optical caustics; PMMA plate; Dynamic energy release rate; Multi-crack propagation; Out-of-plane impact
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Funding
- National Natural Science Foundation of China [11272179]
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In this paper, the multi-crack propagation within polymethyl methacrylate (PMMA) plates under out-of-plane impact is experimentally investigated. First, the dynamic propagation behaviors of in-plane radial and circular cracks are directly recorded using a non-contact optical measurement platform in which a high-speed imaging system is combined with a low-speed impact loading device. Second, the dynamic energy release rates and crack velocities of multiple cracks are studied using caustics, and the effects of impact speed and plate thickness are studied. Finally, a mathematical model of dynamic energy release rate which is related to the radial crack length is established based on the principle of energy conservation. The fracture mechanism of multi-crack propagation in PMMA plates is quantitatively analyzed.
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