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This is Fig. 26 from the 1995 p2stags paper. This slide shows the STAGS prediction of the buckling mode and critical load factor, PA(crit) = 0.124, from linear bifurcation buckling theory. This mode shape is to be used as an initial imperfection in the following nonlinear equilibrium STAGS analysis.
Shown here:
(a) Three-dimensional view of the linear buckling mode
(b) contour plot that shows the slope of the nodal lines of the local linear bifurcation buckling mode and its axial wavelength.
PA is the load factor. PA(crit) is the linear bifurcation buckling load factor. PA = 1.0 is the "design load factor", that is, PA = 1.0 corresponds to the applied load for which the panel was previously optimized by PANDA2.
Since the linear bifurcation buckling load factor, PA(crit) = 0.124, this panel was optimized by PANDA2 for service in its far local post-buckling regime.
(from Computers & Structures, Vol.55, No. 5, pp. 819-856, 1995)
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