We calculated shear buckling critical load, Nxy_cr, both in HyperSizer and according to Method Documentation of HyperSizer (Plate and Shell Equations.HME in Buckling of Failure Analysis). We made this comparison for a few component and we saw that these two result which belong to HyperSizer and Method Document are very different in some cases, although they are similar sometimes.

For the parameters below:

D is the stiffness matrix,

D11: 1050575

D12: 184745

D22: 428207

D33: 211547.5

Buckling Spans,

a: 538.3 mm

b: 1405.5 mm

Shear Load,

Nxy: -40 N/mm

Method Result: 108.76 N/mm

Result is showed by HyperSizer: 158.6 N/mm

What is the reason of this difference? Which one is more reliable? And, if HyperSizer result is more acceptable, how can we calculate the same value analytically?

Thank you