Fracture Behavior of a Corroded Structural Component(EAC1)

概要

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In order to clarify the significance of corrosion damage for risk assessment, bend tests were carried out on a roughened corroded annular plate prepared from the oil storage tank. The tank had been used in service for about 6 years. Corrosive attack occurred extensively on the outer surface of the annular plate just under the welded joint between the shell plate and the annular plate. It was found that a marked decrease of load carrying capacity was noted in the high deflection region depending upon the degree of corrosion damage. The reason for extensive loss of load carrying capacity was successfully explained from successive observation of crack growth behavior on the corroded surface of the annular plate. Photographic evidence showed that multiple cracks, initiated around pits, grew rapidly not only by crack growth by itself, but also by coalescence with other neighboring cracks under the influence of plastic constraint derived from the welded joint. Then, it should be emphasized that the linking up of multiple cracks leading to a catastrophic failure was considered to be a characteristic event of the roughened corroded component, and was expected to occur depending upon the degree of corrosion damage under a complex stress state.
一般社団法人日本機械学会の論文
2001-10-20