Crack-Blunting Mechanisms in Impact Tests on Polymers

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