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Structural Research Series 144PDF


Title:The Effect of Fabricated Edge Conditions on Brittle Fracture of Structural Steels
Author(s):Harris, L.A.; Newmark, N.M.
Subject(s):tensile tests
brittle fractures
Abstract:Static tensile tests were conducted on specimens of a rimmed steel and a semi-killed steel meeting ASTM A7 requirements, a structural silicon steel (ASTM A94), and a low alloy high tensile steel (ASTM A242). The fabricated edge conditions used included machined edges, sheared edges, flame-cut edges, and in some cases flame-cut edges subse~uently flame softened. The flame-cut edges included both manual and guided flame-cut techniques. It is concluded from the tests that for all of the steels tested, the strength and the ductility of the machined edges is good. For all except the silicon steel, the strength and the ductility of the guided flamecut edges were also good. However, for the manual flame-cutting procedure, there was in some cases serious impairment of the physical properties. Even the automatic flame cutting impaired the properties of the silicon steel, but the ductility and strength were restored by subsequent appropriate flame softening of the edge. The sheared edge impaired the ductility of all of the steels tested. The greatest loss in ductility was caused in the semi-killed steel where the maximum strength also was reduced, in some instances falling as low as the yield strength. The harmful effect of the sheared edge on the ductility was apparently eliminated by a subsequent flame softening treatment. The strength and the ductility were increased to practically the same values as those of the same steel with machined edges. Only under the most damaging edge conditions was the strength at a brittle fracture as low as the yield point. With the better methods of edge preparation, the strength was considerably above the yield point and approached the usual ultimate strength of the material.
Issue Date:1957-02
Publisher:University of Illinois Engineering Experiment Station. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Civil Engineering Studies SRS-144
Genre:Technical Report
Sponsor:Committee 15, American Railway Engineering Association
Date Available in IDEALS:2009-09-04

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