2V シャルピ衝撃試験の特性値と Deep Notch Test による脆性破壞発生特性値の相関について

概要

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The relationship between Charpy V-notch impact characteristics and brittle fracture initiation characteristics in Deep Notch Test has been investigated. The summary is as follows : (1) Brittle fracture initiation temperature [Ti]_<C=40>, when the applied stress becomes equal to the half value of yield strength and the crack length is 80mm, is related to Charpy V-notch 50% crystallinity transition temperature in the equation : [numerical formula] where α is yield ratio and t is plate thickness. The coefficient of correlation between measured values of [Ti]_<C=40> and estimated ones is 0.92. (2) The required vTrs becomes more stringent with increasing strength and thickness when [Ti]_<C=40> is constant. (3) For preventing brittle fracture in the weldment at -15℃, the estimated maximum heat input is 170KJ/cm for 60Kg/(mm)^2 class high strength steel, while it is 50KJ/cm for 80Kg/(mm)^2 class high strength steel.
1975-06-05