A forming limit diagram, also known as a forming limit curve, is used in sheet metal forming for predicting forming behavior of sheet metal.[1][2] The diagram attempts to provide a graphical description of material failure tests, such as a punched dome test.
In order to determine whether a given region has failed, a mechanical test is performed. The mechanical test is performed by placing a circular mark on the work piece prior to deformation, and then measuring the post-deformation ellipse that is generated from the action on this circle. By repeating the mechanical test to generate a range of stress states, the formability limit diagram can be generated as a line at which failure is onset (see also formability).
^Marciniak, Z.; Duncan, J. L.; Hu, S. J. (2002). Mechanics of sheet metal forming. Butterworth-Heinemann. pp. 75. ISBN 0-7506-5300-0.
^Llewellyn, D. T.; Hudd, Roger C. (1998). Steels: metallurgy and applications. Butterworth-Heinemann. p. 28. ISBN 0-7506-3757-9.
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