METHOD FOR EVALUATING LONG BRITTLE CRACK ARRESTING ABILITY IN THICK STEEL PLATE, AND TESTING DEVICE AND METHOD FOR MANUFACTURING THICK STEEL PLATE USING SAME

摘要

Provided is a testing device and a method for evaluating long brittle crack arresting ability that is appropriate for an actual ship of thick steel plate (mainly thick steel plate having a thickness of at least 50 mm), the thick steel plate having excellent brittle crack arresting ability and being suitable for use in large container ships, bulk carriers, etc. When a tensile load is applied by a tensile tester in the direction perpendicular to the width of a large test sample having a width of at least 1.5 m, and long brittle crack arresting ability is evaluated for a long brittle crack of length 1 m or greater, a transmitting part for transmitting the tensile load from the tensile tester to the large test sample has thickened parts having a thickness at least 2.5 times that of the large test sample on either side of the center in the width of the large test sample spaced apart at least 2.8 times, preferably at least 4.1 times, the width of the large test sample, and the tensile load from the tensile tester is applied in positions on either side of the center of the large test sample in the direction perpendicular to the width by the thickened parts. A testing device having the transmitting part.