Method of evaluating the long brittle crack propagation stopping performance of thick steel plate

摘要

The large container ships and long brittle crack propagation stopping performance of the corresponding actual ship of thick steel plate excellent suitable brittle crack propagation stopping performance is used, for example, bulk carriers (mainly more thick steel plate 50mm thick plate is) how to evaluate and to provide a test apparatus. To load the tensile load in the width direction perpendicular to the tensile testing machine of large test piece having a 1.5m more than width, evaluate the long brittle crack propagation stopping performance for more than crack 1m of long brittle crack the time, the transmission unit for transmitting the tensile load from the tensile tester to a large specimen, 2.8 times the width of a large test piece increased thickness portion equal to or larger than 2.5 times the thickness of a large specimen , more preferably at intervals to be 4.1 times or more, has across the width center of the large test pieces, tensile load from the tensile testing machine, across the width perpendicular to the direction of the center of large test pieces thickened part it is loaded in position. The test apparatus having a transfer unit.