Abstract
The effect of the specimen thickness and the crack length on the fracture toughness are investigated for three point bend (3PB) specimen and CCT specimen. In 3PB specimen the JICap value increases with decreasing the crack length and the clear thickness effect dose not exist for fracture toughness value. The three dimensional finite element analysis are conducted for these specimens. The Q factor decreases with decreasing the crack length or the specimen thickness in 3PB specimen. The Q factor of CCT specimen is lower than that of 3PB specimen. The relation between the Q factor and JICap value is examined. The JICap value increases with decreasing the Q factor when the crack length decreases in 3PB specimen. The dimple fracture surfaces of 3PB, CCT and CCB (center cracked bend) specimens are observed by SEM. The dimple diameter of CCB specimen is the smallest and the diameter of CCT specimen is smaller than that of 3PB specimen.
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