【摘 要】
：
Due to high specific stiffness and strength,stiffened shells have been widely used in fuel tanks and interstages of launch vehicles.Since stiffened shells a
【机 构】
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DepartmentofEngineeringMechanics,StateKeyLaboratoryofStructuralAnalysisforIndustrialEquipment,Dalian
【出 处】
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Asian Congress of Structural and Multidisciplinary Optimizat
论文部分内容阅读
Due to high specific stiffness and strength,stiffened shells have been widely used in fuel tanks and interstages of launch vehicles.Since stiffened shells are highly sensitive to the actual geometrical imperfections,Worst Multiple Perturbation Load Approach (WMPLA) was proposed to provide an accurate prediction for Knockdown Factor (KDF)of stiffened shells[1].The objective of WMPLA is to find the lower bound of the buckling load by optimizing the positions of multiple perturbation loads.The effectiveness of WMPLA has been validated for unstiffened shells,composite shells,stiffened shells,stiffened shells with cutouts,conical stiffened shell and hierarchical stiffened shells[1]-[4].Furthermore,a high-fidelity approximate model was developed for stiffened shells,which significantly improved the computational efficiency of WMPLA[5].Validated by the buckling tests of a 5 mdiameter stiffened shell[6]and five 1-mdiameter unstiffened shells[7],WMPLA has showed significantly higher prediction accuracy in the actual buckling load than NASA SP-8007 and Single Perturbation Load Approach (SPLA).
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