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This paper describes the test equipment developed and the procedures used to evaluate structural sheet material compression properties at preselected constant strain rates or loads. Electrical self-resistance was used to achieve a rapid heating rate of 200 F per sec. Four materials were tested at maximum temperatures which ranged from 600 F for an aluminum alloy to 2000 F for a Ni-Cr-Co iron-base alloy. Tests at 0.1,0.001, and 0.00001 in. per in. per sec showed that strain rate has a major effect on the measured strength, especially at the high temperatures. The tests, under conditions of constant temperature and constant compression stress, showed that creep deformation can be a critical factor even when the time involved is on the order of a few seconds or less. The theoretical and practical aspects of rapid-rate compression testing are presented, and suggestions are made regarding possible modifications of the equipment which would improve the over-all capabilities.
Bernett, E. C.
Research Specialist, California Institute of Technology, Pasadena, Calif.
Gerberich, W. W.
Research Engineer, California Institute of Technology, Pasadena, Calif.