きれつの変位挙動と脆性破壊の発生

概要

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In general, brittle fracture of steel structures is preceeded by the formation of a plastically deformed region ahead of a crack which in most cases is too large to be neglected in size compared to the crack length.A recent trend shows that the crack opening displacement (C.O.D) theory is a powerful approach to fracture mechanics especially for cases having a large scale yielding ahead of crack.Authors have been investigating on the applicaiton of the C.O.D. theory toward the analysis of brittle fracture initiation phenomena in relatively complex steel structure, and have found that the theory agrees well for the analysis of brittle fracture of large structur. This paper deals mainly with the displacement behavioes loaded members having cracks. Experimental data for C.O.D. using deep notch type specimen agrees well with the theoretically calculated values.The effect of preloading upon critical C.O.D. is experimentally investigated and dicsussed.