The impact resistance of plastics can be described in terms of three contributions; these are the elastic, plastic, and crack propagation phases. By using a recording pendulum impact device it is possible to analyze any material as to the relative importance of the above phenomena. It was found that most plastics which exhibit good impact resistance have large plastic elongations or good resistance to crack propagation or both. A simple analysis of the cantilever beam impact shows that reasonable values of modulus and of maximum fiber stress can be obtained if care is taken to account for shear and compressive contributions to the overall response. It was also noted that plastic samples under impact conditions tend to bounce against the striker head.
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C. B. Arends (1965) studied this question.