Chevron-notched toughness of materials with rising fracture resistance curves

摘要

The effect of rising resistance cures on the fracture toug- ness determined from chevron-notched beam tests is esti- mated via a set of simple numerical calculations. It is shown that for materials with a rising resistance curve, the tough- nesses determined by the peak load method and by the work of fracture method are both higher than the initia- tion toughness, and both depend on the sample size relative to the length over which the resistance curve increases.