Following are options related to postbuckling.
Local Postbuckling Effective Width Empirical Correction Factor (Default = 1.0)
Compression postbuckling - applies a constant factor to the effective width (be) solutions. This can be used to correlate effective width to test data.
b'e = k be
Local Postbuckling Include Load From Non-Effective Skin (Default = False)
Compression postbuckling - in traditional methods (NACA, Bruhn), the non-effective portion of the postbuckled skin is assumed to have zero load. By activating this flag (True), the non-effective portion of the skin will be given a level equal to the initial buckling load.
Local Postbuckling Forced Crippling Coefficient (Default = 26,000 psi)
Shear postbuckling - material dependent coefficient (C) from the NACA 2661 Forced Crippling Method. This value must be entered in psi.
FFC = C k2/3 (tst/t)1/3
Local Postbuckling Diagonal Tension Full Panel Bending (Default = True)
Shear postbuckling of curved panels - causes development of a secondary bending moment which is superimposed on the stringer. In Bruhn, this bending moment is accounted for by simply adding the maximum stress due to this bending moment into the crippling analysis. However, rather than take this approach, when this flag is set to True, HyperSizer calculates and superimposes the bending moment on the panel before calculating any margins of safety. If this flag is set to False, HyperSizer will not superimpose the actual bending moment, but will use the maximum stress approach from Bruhn.
Local Post Buckling Deactivation Local Buckling Margin (Default = 3)
If the local buckling margin of safety is greater than this value, then the local postbuckling analysis is deactivated (for the current load case). This reduces the computational load during sizing.