The Materials panel allows you to specify the properties of the metal to be formed.  For the stress strain curve, you can either supply a set of data points or the values for the parameters used in the Krupkowski-Swift hardening law.  The altair_mat.db file, located in the bin directory, is a library of materials commonly used in stamping.  All the relevant properties for each material are included in this file.  You can also create new material libraries in your directory that can be accessed from any HyperForm model file.

How do I...

1. From the OneStep browser, right-click on the Materials folder and select Edit or Database.

Strain hardening is modeled using the Krupkowski-Swift law:

Planar anisotropy is modeled using directional Lankford coefficients, . An average r value is determined from these coefficients using the formula:  r= [r0 + 2r45 + r90]/4.  Normal anisotropy of the material is modeled using an average plastic strain ratio, r.

r0 = X axis

r90 = Y axis

It is suggested to rotate your part in order to make the rolling direction (r0) coincident with the X axis.

Some material properties can be calculated from other material property values. Those properties are indicated on the panel with an asterisk (*).

 

See also

Material Variables