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This is part of Fig. 5 from the 2013 GENOPT paper2. Shown here are results from the specific case called “oneskirt”: Prebuckled states, (A), (B) from GENOPT/BIGBOSOR4 for the optimized propellant tank with one skirt attached at the midlength of the cylindrical part of the tank. In (A) the stress at Point 1 is fiber tension at the tips of the internal orthogrid stringers (layer 1), the stress at Point 2 is the outer surface effective stress in the skin (layer 2), and the stress at Point 3 is the effective stress near the thin end of the tapered external doubler (layer 3). In (B) the stress at Point 1 is fiber tension at the tips of the internal orthogrid stringers (layer 1), the stress at Point 2 is the outer surface effective stress in the skin (layer 2) near the junction of the cylindrical part of the tank with the forward ellipsoidal dome, and the stress at Point 3 is the effective stress near the thin end of the tapered external doubler (layer 3). The stresses listed in this figure are taken from Table 3. Compare with predictions from STAGS shown in Fig. 7. NOTE: STAGS does not predict stresses in smeared stiffeners. Therefore, STAGS cannot predict the stresses at Points 1 in (A) and (B) (fiber tension at the tips of the internal orthogrid stringers).
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