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This is Fig. 9 from the 1987 PANDA paper. This slide shows assumed buckling modal patterns (straight buckling nodal lines) in the panel skin in the presence of in-plane shear loading and/or anisotropic laminates.
(a) the model used if the panel is "long" in the x-direction,
(b) the model used if the panel is "long" in the y-direction.
[NOTE: there should be a coefficient "C" in the expression for w in (b)].
In 1999 a more elaborate "alternative" double trigonometric series expansion solution was introduced into PANDA2, formulas for which are shown two slides hence and results from which are displayed three slides hence.
Both the simple and more elaborate solutions are retained in the PANDA2 "stable" of buckling models.
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