Development of Design Method of Dimensions and Layouts of Thin Walled Plate and Shell Structures Having Maximum Shock Energy Absorption Ability

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(1) Development of Static sensitivity Analysis Technique of Largely Deformed Thin Walled Plate and Shell Structures of Elastoplastic Materials and Its Application to Buckling ConstraintDirect differentiation method of static sensitivity analysis of largely deformed elastoplastic plate and shell structures is formulated for isoparametric shell elements based on the Newton-Raphson iteration scheme. The sensitivity analysis technique is applied to implement the efficient optimization using approximation method, in which a subproblem of minimum weight design under buckling constraints is constructed by the Taylor series expansion and solved by the quadratic programming method. Numerical examples of cylindrical shell and thin walled plate with stiffeners are implemented by the developed optimization technique.(2) Development of Dynamic Sensitivity Analysis Technique of Largely Deformed Thin Walled Plate and Shell Structures and Its Application to Shock Energy Absorption ProblemsThe direct differentiation method of dynamic sensitivity analysis of largely deformed elastoplastic plate and shell structures is formulated for the nine-node shell element based on the Newmark method and the Newton-Raphson iteration scheme. The formulated method is applied to the sensitvity analyzes of maximum nonlinear buckling load and the absorbing energy, and to the maximization design of absorbing energy of thin walled shell structures. Then, the effect of structural dimensions to the absorbing energy is discussed.Crushing Experiment of Energy Absorption Effect by Thin Walled Cylinder with SlitsAluminum cylinders with slits are crushed experimentally, and the absorbing energy is measured directly. Then, the effect of slit location and number of slits are investigated.