Testing methods tensile-impact instruments

Methods employed to determine the impact resistance of plastics include pendulum methods (Izod, Charpy, tensile impact, falling dart, Gardner, Dynatup, etc.) and instrumented techniques. In the case of the Izod test, what is measured is the energy required to break a test specimen transversely struck (the test can be done either with the specimen notched or unnotched). The tensile impact test has a bar loaded in tension and the striking force tends to elongate the bar (Chapter 5, Impact Strength). 

The method of instrumented notched tensile-impact testing is preferably used for elastomeric materials which cannot be tested under other impact-like loading conditions. However, also for thermoplastics, especially thermoplastic films, also the characterization of the fracture behaviour under impact loading can be necessary. Therefore, the following Tables show a summary of available data of fracture mecha-nics tests under impact-like loading conditions for thermoplastics and elastomers. 

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