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This and the next many slides are from papers about the PANDA2 computer program for the optimization of stiffened, laminated composite curved and flat panels subjected to multiple sets of combined loads.
This and the next three slides are from the paper:
"Theoretical basis of the PANDA computer program for preliminary design of stiffened panels under combined in-plane loads" by David Bushnell, Computers & Structures, Vol. 27, No. 4, pp. 541-563, 1987, called "1987 PANDA paper" in the next three slides.
This slide shows Fig. 1 from that paper. Most of the PANDA capability has been incorporated into the successor program, PANDA2. Therefore, the PANDA program has been superseded by the PANDA2 program.
ABSTRACT FROM THE PANDA PAPER:
A theory based on minimum potential energy for the bifurcation buckling of elastic or elastic-plastic isotropic or elastic composite, flat or cylindrical, ring- and stringer-stiffened panels subjected to combined in-plane loads is derived. Equations are given for general instability, panel instability and local instability of panels with fully populated 6 x 6 thickness-integrated constitutive matrices. Also derived are equations for crippling and rolling of stiffeners. The theory has been implemented in user-friendly, interactive computer programs called PANDA and PANDA2 for the minimum-weight design of panels.
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