Abstract
Two novel techniques and evaluation procedures for the fracture mechanical characterization of fibre reinforced plastics (FRPs) in the intralaminar mode I (crack opening mode) and mode II (shear mode) based on the fracture energy concept are presented. The splitting (mode I) as well as the punch-through shear (mode II) test are experimentally simple; the loading device and the sample geometries are small and well suited for measurements at cryogenic temperatures on both unirradiated and irradiated samples. The test results are load versus displacement curves, from which the strain-softening behaviour of the FRPs can be evaluated employing finite element calculations (FEM). All material parameters necessary for the FE calculations of the fracture behaviour can be taken directly from the strain-softening diagram and represent characteristic intrinsic material parameters (fracture parameters). Results obtained on a two-dimensionally glass fibre reinforced epoxy laminate are presented.
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