Abstract
The tests for determining fracture data which are described in literature often deal with the methods of linear-elastic fracture mechanics (LEFM). The critical stress intensity factor KIC can only be determined with unusually large material thicknesses and, in addition to that, is strongly dependent on temperature and time. Therefore, great problems are involved in transferring the LEFM-data to thin-wall mouldings. Even more difficulties are encountered in the case of multilayer fiber-reinforced thermoset mouldings, where the LEFM only yields efficient results if cracks propagate between the layers in the resin.
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