doi: 10.1126/science.284.5418.1337.
Cracks faster than the shear wave speed
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- PMID: 10334984
- DOI: 10.1126/science.284.5418.1337
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Cracks faster than the shear wave speed
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Abstract
Classical dynamic fracture theories predict the surface wave speed to be the limiting speed for propagation of in-plane cracks in homogeneous, linear elastic materials subjected to remote loading. This report presents experimental evidence to the contrary. Intersonic shear-dominated crack growth featuring shear shock waves was observed along weak planes in a brittle polyester resin under far-field asymmetric loading. When steady-state conditions were attained, the shear cracks propagated at speeds close to 2 times the material shear wave speed. These observations have similarities to shallow earthquake events where intersonic shear rupture speeds have been surmised.
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