Abstract

The literature on formability and LDH (Limited Dome Height) testing is reviewed. The LDH tooling uses a 4.0 inch (100 mm) diameter punch, and various widths of specimens are used to give various strain ratios. The strains are then plotted on forming limit curves (FLD’s).

In this paper, the development of a new mini-LDH test for thin sheet metal is described. The test involves a new geometry of specimens and a fixture which can be mounted in any universal testing machine with a low enough force range. The size effect is studied by conducting LDH tests with smaller diameter punches: 2.0 inch (50.8 mm), 0.50 inch (12.7 mm), and 0.25 inch (6.35 mm) diameters. Experimental results are presented for 0.010 inch (0.254 mm) thick 1100-H19 aluminum, and 5182-H19 aluminum.

An analysis is also presented for the fully biaxial case and the plane strain case in order to model the experimental results.

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