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This is part of Fig. 10a from the 2013 GENOPT paper2. Shown here are results from the specific case called “twoskirt”: Prebuckled states, (A), axial acceleration and (B), lateral acceleration from GENOPT/BIGBOSOR4 for the optimized propellant tank with two skirts attached at the cylinder-dome junctions. 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 fiber compression in layer 13 of the laminated composite strut, and the stress at Point 3 is the effective inner surface stress at the thick end of internal prong (layer 1 of Segment 35) nearest the tank end of the forward skirt. In (B) the stress at Point 1 is fiber tension at the tips of the internal orthogrid stringers (layer 1), and the stress at Point 2 is the effective inner fiber stress at the thin end of the internal prong (layer 1 of Segment 4) nearest the tank end of the aft skirt. The stresses listed in this figure are taken from Table 4. Compare with predictions from STAGS shown in Fig. 12. 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 smeared orthogrid stringers).
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