In order to obtain new parameters available for assessing deep-drawability and pure-stretchability of sheet metals, a bulge test employing concentrically grooved disks is investigated. Both the limiting polar height and the thickness strain measured at a designated point near the groove in a burst specimen are useful for the assessment of pure-stretchability. Moreover, the foregoing two formabilities can be assessed relatively well in terms of the oil pressure and the geometry of specimens at burst initiation. These three parameters can be obtained by a single-blank test.
Assessment of Deep-Drawability and Stretchability by Bulge Test of Concentrically Grooved Metal Disks
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Kawai, N., and Kurosaki, Y. (February 1, 1977). "Assessment of Deep-Drawability and Stretchability by Bulge Test of Concentrically Grooved Metal Disks." ASME. J. Eng. Ind. February 1977; 99(1): 229–236. https://doi.org/10.1115/1.3439143
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