Abstract
At present, a standard test method for the fracture toughness of high polymer materials has not been fully developed in comparison with that for metallic materials. In this paper, fracture toughness tests using polycarbonate test specimens were carried out. The following conclusions were obtained : (1) In the fatigue precrack introduction, frequency (f) and maximum stress intensity factor (Kfmax) had no influence on the fracture toughness values. (2) The fracture toughness values obtained were almost independent of the crosshead velocity (V), and were completely independent of the load condition Pm/PQ≤1.1.
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