Abstract
In general, the structural shape optimization method based on the fully stressed design gives us a solution of too complex shape which will be difficult to be manufactured. The present paper proposes a novel approach to the determination of moderately complex shapes that satisfy the requirement for lightweight, high stiffness and enough strength. There are two original ideas in this method. One is for the clear definition of shape complexity. A new parameter CD (curvature deviation) which represents the degree of structural shape complexity is proposed. The other is a method of derivation of moderately complex shapes that satisfy the requirement for lightweight, high stiffness and strength. A smoother shape is derived by an evolutional change of CD, while a structural shape is obtained by an iterative change of an allowable stress region. The proposed method has been verified by applying it to the design of a hook.
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