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In the previous paper, the results of constant load delayed fracture tests by using the compact tension specimen of SNCM 8 (AISI 4340) steel were presented and the characteristics of crack growth rate and delayed fracture toughness were discussed. In this study, constant deflection delayed fracture tests were performed in tap water by using modified wedge-opening (WOL) specimens of SNCM 8 to examine the effects of specimen thickness and strength level on delayed crack growth rate and thresholddoi:10.2472/jsms.29.623 fatcat:o47btjkrtfhshgtmfuywqjjeru