Test Methods For Formability Of Sheet Metal

The old saying garbage in garbage out rings true in this regard.

Test methods for formability of sheet metal.

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. Astm e517 standard test method for plastic strain ratio r for sheet metal decides its determination. Astm e646 stan dard test method for tensile strain hardening exponents of metallic sheet materials governs the determination of the strain hardening exponent. The fem and experimental methods were used in order to demonstrate how two dimensional in plane simulation can help interpret and develop such tests as well as to understand the nature of material behavior and governing mechanics.

Sheet metal forming simulation is almost meaningless without accurate material data. It is assumed or considered that the larger is the value of total elongation the more formable is the material. Anisotropy in sheet metals. 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.

This inexpensive and simple way of evaluating formability however is not very reliable because while. To correctly and accurately capture the mechanical properties of material for use in simulation a tensile test is performed. Astm e646 is a tensile test that measures the stress strain response in the plastic region prior to necking dp 0. Tips for sheet metal testing.