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Precracked Charpy 시편의 파괴인성 측정에 있어서 Unloading Compliance 방법의 적용
한대준,최순필 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.10
Special specimen zigs and side grooves were used to prevent the apparent negative crack growth and to measure the crack length correctly in the 3-point bend J_(1C) test using unloading compliance method. All the specimens were Chapy impact types made of SA 533 B 1 steels, and the loading-unloading process was accomplished by the computer controlled MTS. The initial crack length and the crack growth could be measured within the error of 3% and 12% respectively. The apparent negative crack growth could be prevented to use the special specimen zigs and side grooves.