The Bi-Axial Strength of Heat-Treated Alloy Steel Sheets and Weldments

摘要

This investigation deals with the development and application of a simple testing technique which measures the strength of metallic sheets and weldments under biaxial loading conditions, simulating those found in a cylindrical pressure vessel. The test technique employed is a simply slotted sheet tensile specimen, which uses a large elastic bulk to restrain plastic flow in a direction perpendicular to that of the applied tensile load, thus creating a condition of plane strain. The following conclusions may be drawn: (1) A slotted sheet specimen may be used to create a condition of plane tensile strain and associated two-to-one bi-axial tensile loading in weldments and base metals. (2) The specimen offers the simplest method yet developed to measure the effects of bi-axial loading upon tensile strength. (3) Under conditions of two-to-one tensile loading, the strength of heat-treated alloy steel sheet and weldments is raised appreciably. (4) Tensile strength increases of greater than 10% are possible for both base metals and weldments, but the magnitude of this increase may be influenced by both strength level and weld quality.