INSTRUMENTED IMPACT TESTING OF PHENOLPHTHALEIN POLYETHER KETONE

The Charpy impact fracture behaviour of unnotched specimens of phenolp hthalein polyether ketone (PEK-C) was studied over a temperature range from room temperature to 220 degrees C by using an instrumented impac t tester. The load-time and energy-time curves of PEK-C at different t emperatures were recorded. From these curves, some important parameter s, such as the maximum impact load, the maximum stress, the total impa ct energy, the crack initiation energy, the crack propagation energy e tc., were obtained and their temperature dependences of PEK-C were inv estigated. The point of 100 percent maximum load on the load-time trac e was shown to be the yield point. Two parameters, the ductile ratio ( D.R.) and the ductility index (D.I.) were applied to characterize the ductility of PEK-C and their relationships to the relaxation processes were discussed.