METHOD FOR DETERMINATION OF BRITTLE CRACK PROPAGATION STOPPING PERFORMANCE IN HIGH-INTENSITY THICK STEEL PLATE

摘要

A method of determining brittle crack propagation arrestability of a high-strength steel plate includes the steps of: performing a large-scale test and a composite small-scale test using standard steel; calculating a correlation model of the result of the large-scale test and the result of the composite small-scale test using the standard steel; performing the composite small-scale test using a steel specimen; and estimating the brittle crack propagation arrestability of the steel specimen by substituting the result of the composite small-scale test using the steel specimen into the correlation model. The composite small-scale test includes the sub steps of: (a) sampling a surface-small-scale-test-piece including a surface part of a steel plate; (b) sampling inner-small-scale-test-pieces from one or more inner regions not including the surface part of the steel plate; (c) performing a drop weight test using the surface-small-scale-test-piece; and (d) performing a small-scale test of measuring a brittle fracture percentage or absorbed energy using the inner-small-scale-test-pieces. The composite small-scale test includes performing the small-scale test on the surface-small-scale-test-piece and the inner-small-scale-test-pieces through the use of different methods.