Abstract
GENOPT/BIGBOSOR4 is applied to the problem of an axially compressed perfect elastic cylindrical shell the wall of which is a composite truss-core sandwich. The truss-core sandwich is constructed of trapezoidal core tubes that are sandwiched between two face sheets. At the junction of the core webs and the face sheets are “noodle” regions that are filled with unidirectional composite material. The design constraints are local buckling, general buckling, and five stress constraints for each material. Local and general buckling are computed from BIGBOSOR4 models in which the huge torus prismatic representation of the cylindrical shell is employed. In both the local and general buckling models the huge torus representation of the cylindrical shell consists of a number of identical modules of the cross section of the truss-core sandwich wall that are strung together along the curved meridian of the huge torus. The rather elaborate 22-segment module used for local buckling includes small curved and straight segments that occur at the corners of the trapezoidal tool around which the truss-core is wrapped during the fabrication process. The presence of noodles that fill the prismatic triangular-like gaps between adjacent trapezoids is accounted for. BIGBOSOR4 models are included that determine approximately the effect on local buckling of support by each noodle of the little shell segments that enclose it. The six-segment module used in the general buckling is much simpler than the 22-segment module used for local buckling. It consists of six shell segments analogous to those used in the truss-core sandwich model employed in PANDA2. The effect of the noodles is accounted for, however, which is not possible in the PANDA2 model. Also, the GENOPT/
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