ASTM International Standard Test Method for Determining Forming Limit Curves ASTM E2218-14

1.1 This method gives the procedure for constructing a forming limit curve (FLC) for a metallic sheet material by using a hemispherical deformation punch test and a uniaxial tension test to quantitatively simulate biaxial stretch and deep drawing processes. 1.2 FLCs are useful in evaluating press performance by metal fabrication strain analysis. 1.3 The method applies to metallic sheet from 0.5 mm (0.020 in.) to 3.3 mm (0.130 in.). 1.4 The values stated in SI units are to be regarded as the standard. The inch-pound equivalents are approximate. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.