Evaluation of Torsional Properties of Spring Materials
ARMY WEAPONS COMMAND ROCK ISLAND IL GENERAL THOMAS J RODMAN LAB
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Torsional properties of various spring materials were evaluated. All materials tested were of solid circular cross section with a diameter of approximately .200 inch. Test specimens were twisted on a torsion tester equipped with an automatic recorder by which torque-angular strain diagrams were plotted. Diagrams were analyzed and measurements made to determine values for proportional and elastic limits. The amount of increase to the proportional and elastic limits that results from strain hardening was determined. The effects of shot peening on the elastic limit were also studied. Strain hardening of the high carbon steels had little effect on the proportional limit, but did produce a substantial increase in the elastic limit. The shot peening operation had little noticeable effect on the torsional properties. Detailed tables of torsional properties are presented and results discussed.
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