Abstract
Impact value is the sum of energy W1 required to initiate a crack in specimen and the energy W required to spread the crack. The magnitude of W1 can be estimated from tension test data but W cannot. In this experiment, round bars with a circumferential crack were fractured in tension and the thickness of the plastically deformed layer adjacent to the fractured surface (which was brittle) was estimated by taking X-ray reflection patterns. Thus the energy absorbed in that layer in the course of fracturing was estimated. This energy has close relation to W. It was shown, in steel, that the smaller the values of energy absorbed in the fractured surface, the more apt is the material to fracture in brittle manner even if a tiny crack is present. In steel this tendency can be foreseen, in some degree, by the magnitude of impact value of the material.
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