INSTRUMENTED IMPACT TEST: DETERMINATION OF CRACK RESISTANCE CURVES OF POLYMERS

摘要

The paper shows the advantages and disadvantages of using the known standards and the ESIS TC4 testing protocol for toughness characterization of high impact polymers. Several methods to produce different amounts of stable crack growth where compared. It can be shown that the multiple specimen stop-block technique gives the most conservative results. The influence of specimen thickness and crack length on the J-Δa curves of ABS (acrylonitrile-butadiene-styrene) and nylon was also investigated. A direct connection between the toughness of the material and the necessary specimen thickness was found.