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Due to the very large number of tests offered, descriptions of those most commonly requested have been gathered into the following groups:
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The ball punch deformation test is used for evaluating the ductility of metallic sheet materials. The test involves biaxial stretching of a constrained test specimen. Ideally, no draw-in of flange metal from under the hold-down occurs. The sheet metal test specimen is bulged at a specific rate until the load drops or until either necking or fracture occurs; the test is then terminated. Ball punch (penetrator) movement to drop in-load or necking or fracture is the test result. It is known that test results may vary with hold-down force, lubrication, and criterion for determining the end point of the test.
ASTM E643 testing covers the procedure for conducting the ball punch deformation test for metallic sheet materials intended for forming applications. The test applies to specimens with thickness between 0.008 and 0.080 in. (0.20 and 2.00 mm). (This includes the Erickson Test and Olsen Cup Test).
The ball punch deformation test is widely used to evaluate and compare the formability of metallic sheet materials. Biaxial stretching is the predominant mode of deformation occurring during the test and, therefore, the results are most often used to rate or compare materials that are to be formed mainly by stretching. However, precise correlations between the cup height as determined by this test and the formability of a sheet material under production conditions have not been established.
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Reference: ASTM E643 – Standard Test Method for Ball Punch Deformation of Metallic Sheet Material