The wrinkling coefficients, k1 and k2, can be adjusted on the options tab of the Project Sizing form. k1=0.63 and k2=0.82 are simply the default values in our template database. You may change these factors, then right-click and select "Set as Database Default" to apply your new default values.
The closed form solutions for wrinkling use the strength design-to loads. For an FEM, the strength loads are calculated using the statistical loading method selected on the Design-to Loads tab. You have the option to select a statistical method (1 sigma, 2 sigma, etc.) or element based.
*updated "AID091 Sandwich Facesheet Wrinkling.HME.pdf" version 6.1