Test Methods For Formability Of Sheet Metal

Anisotropy in sheet metals.

Test methods for formability of sheet metal.

Tips for sheet metal testing. During rolling the sheet develops anisotropy both in the plane of the sheet called planer anisotropy as well in the thickness of sheet called anisotropy ratio. Sheet metal forming simulation is almost meaningless without accurate material data. Astm e646 is a tensile test that measures the stress strain response in the plastic region prior to necking dp 0.

In sheet metal industry the initial estimation of formability is usually based on total elongation measured from the tensile test. In this chapter 1 sheet metal formability tests such as the tensile test the plane strain test and the in plane stretching test are analyzed. The old saying garbage in garbage out rings true in this regard. The r value of sheet varies with the applied axial strain and as such should be reported at the tested strain level unlike many other materials with r values that stay constant over the range of plastic strains.

Anisotropy in sheet metal can be useful in deep drawing and other forming processes. Astm e646 stan dard test method for tensile strain hardening exponents of metallic sheet materials governs the determination of the strain hardening exponent. To correctly and accurately capture the mechanical properties of material for use in simulation a tensile test is performed. This inexpensive and simple way of evaluating formability however is not very reliable because while.