Ductile-to-brittle transition characterization using surface crack specimens loaded in combined tension and bending

摘要

Surface cracked tension specimens of ASTM A515, Grad B steel plate were tested to failure in the ductil-to-brittle transition region. Two different specimen configureations were used: one configuration was loaded in tension except for the natural bending resulting from the presence of the surface crack, the second cinfiguration had an offset test section and was poin-loaded to provide a strong bending component in addition to the tension load. For each confikguration, at least senven repeat tests were condicted at each of two temperatures. All specimens failed by cleavage and the critical J-integral, J_c, was obtained using three-dimensional finite element analysis of the speciment. The FEM analysis was validated bycomparison with experimental strain gage and displacement measurements taken during the tests.