Abstract
A drop weight testing machine is described to measure the J0.2-values of polymers in impact within the frame work of fracture mechanics. By changing the weight of a piston falling from the same drop height on the specimen, the impact velocity is constant but the impact energy is varied. This principle of impact testing is applied to the three point bending test in non-linear fracture mechanics. The apparatus is additionally instrumented with a load cell and a displacement transducer to follow the energy transfer during impact deformation in more detail. It is shown that polyethylene with shear yielding develops a strong selfstabilizing effect against crack propagation, which is less pronounced in ABS which deforms by crazing.
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