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In fracture toughness testing of ceramics, it is well known that notch sharpness gives a large effect on the fracture toughness. In this respect, the fracture toughness tests were carried out on acrylic resin. Plate specimens with different notch sharpness were prepared. The different artificial notches were introduced into the specimens by means of micro-grinding disk, fret saw, laser machining, razor and fatigue pre-cracking. It was found that the fracture toughness KIc decreased with increasing the notch sharpness. As a fracture criterion, it was found that the fracture occurred when the stress at a definite point ahead of the notch tip reached the critical value. In addition, it was also clarified that the specimen thickness (5•`l5mm) hardly influenced the the value of KIc.

Effects of notch sharpness and plate thickness on the fracture toughness KIc of acrylic resin.