Abstract
Two tests for sheet forming applications have recently been developed at the Ohio State University (OSU). The developments involved numerous experiments with several materials, comparison with results from previous tests, and finite element simulation to optimize and verify the geometries. The OSU Formability Test is more reproducible than the Limiting Dome Height (LDH) test, it more closely follows the desirable plane-strain path, and it takes roughly 1 5 to 1 10 of the time to perform. There is good correlation between formability evaluated using the two tests. The OSU Friction Test is a new technique for measuring the friction coefficient over the punch during sheet forming operations. It more closely simulates punch friction conditions in terms of rates and increasing wrap angle. Results show that punch friction depends on the angle of wrap, which varies with punch stroke, and on strain rate, which depends on punch velocity. The two tests will be described and typical results will be presented for several sheet materials.
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