Bar stock of two steels - a micro-alloyde grade and 1541, a C-Mn forging grade - in both the as-rolled and several cold-drawn conditions were fatigue tested under strain-control. The present results are compared to previous results from strain-controlled fatigue tests on sheet, plate, shape, and bar stock by Bethlehem, and others on a wide range of grades in various conditions - as-rolled, cold-worked, aged, heat-treated, etc. The fatigue strength at one-million cycles is plotted versus the monotonic or engineering tensile strength for present tests as well as previous and published tests on a wide range of steel products. Generally, it is implied that the scatter in such a plot is experimental variability. A superior correlation is shown herein when the cyclic true stress-strain parameters developed form strain-controlled fatigue test are used. Introduction of the cyclic parameters tightens the correlation between static and cylic strength because the effects of cyclic hardening or softening are now included.
Effect of cold-forming on the strain controlled fatigue resistance of automotive steels
Einfluß der Kaltverformung auf die spannungskontrollierte Dauerfestigkeit von Automobilstählen
SAE-Papers ; 1-13
1992
13 Seiten, 12 Bilder, 3 Tabellen, 16 Quellen
Conference paper
English
Effect of cold-forming on the strain controlled fatigue resistance of automotive steels
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