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概要

The failure mode so called a local failure could occur at a specific structural discontinuities of pressure vessels. Local failure, which is a type of ductile fracture, generally occurs under multiaxial stress conditions. In this paper, tensile tests and elastic plastic finite element analyses for smooth and notched specimens were performed to study a mechanism of local failure. From these investigation, it was concluded that the local failure occurs under high triaxial stress conditions and this conditions are affected by plastic constraint, which is controlled by configurations of structural discontinuity. Based on these results, the new fracture surface considering effects of hydrostatic stress components was proposed. This fracture surface can express the ductile fracture and the local failure by unified manner.

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