Abstract
The elastic-plastic fracture toughness JIc value and fracture resistance of A533B-1 steel were evaluated using compact type (1/2CT, 1CT and 2CT) specimens. The results obtained are summarized as follows:(1) According to the standard method of the Japan Society of Mechanical Engineers (JSME), the JIc value can be evaluated accurately by using the smaller size of specimens compared with the ASTM method.(2) The valid JIc value becomes constant regardless of stress states or yielding conditions, when J integral is evaluated from a load-load line displacement curve.(3) As long as the flat fracture preceeds in the midthickness of the specimen, the tearing modulus, TJ(Δamax), evaluated from the J-Δamax resistance curve, becomes a material constant for a wide range of Δamax.(4) Before the initiation of shear fracture, the following equation can stand;Δaave=0.38ΔamaxWithin this region, TJ(Δaave) evaluated from the J-Δaave resiatance curve becomes constant in appearance. However, as the area of shear lips increases, TJ(Δaave) decreases rapidly.
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