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A three-dimensional, elastic-plastic fracture strength correlation for A36 and HSLA structural steel connections containing discontinuities was determined. The fracture specimens comprised beam-column connections in which one column flange contained a mid-thickness plane of discontinuity. Beam loading or direct tension applied normal to the column face imposed tensile load transfer around the boundaries of the discontinuity. Fracture extension was mixed mode (crack opening and edge sliding), and inclined toward the free surface on the web side of the column flange containing the discontinuity. Successful correlation for these specimens was accomplished with a plastic stress singularity strength model, if the discontinuity was sufficiently large. The average singularity strengths at ultimate load were 64.6 MNm -3/2 (58.7 ksi in.1/2) for HSLA steels, and 53.7 MNm -3/2 (48.8 ksi in.1/2) for A36 steel. The percent coefficient of variation was 6.4 percent for HSLA steels and 8.4 percent for A36 steel.
fracture (materials), failure, cracking (fracturing), elastic theory, plastic theory, tensile properties, stress-strain diagrams, bend tests, analyzing steels, structural steels, crack propagation
Research engineer, Bethlehem Steel Corp., Bethlehem,