Abstract
Some impact tests are described in which
G
c
, the fracture toughness, of three polymers was determined over a range of strain rates and temperatures. It was found that at high strain rates there was a substantial variation of
G
c
with rate. When this was investigated as a function of loading times, it was observed that the most likely explanation was in terms of notch tip blunting induced by adiabatic heating at the crack tip. A model of this process is presented which provides a good description of the observations and suggests some useful guidelines for practical impact testing.
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5. Crack blunting mechanisms in polymers
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