18. Effects Of Compressive Prestrain on Fracture Toughness

概要

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In connection with buckling accident of ship, the deteriorating effects of extremely high compressive prestrain on ductility of a mild steel were discussed in the present paper. Steel prestrained by uniform compression up to about -35 % was tested in Charpy test and compact tension test. In order to attain to higher compressive prestrain, steel plates were deformed by bending to several levels of prestrain up to about -80 % and Charpy test was carried out. In order to examine the possibility of brittle fracture in buckling accident unnotched plates were bent to various angles and unloaded, and then reversely bent. The results confirm that the ductility of a mild steel is reduced with the increase of compressive prestrain and brittle crack initiates in buckled part of which absolute value of compressive strain is in excess of fracture ductility of steel.
社団法人日本船舶海洋工学会の論文