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Description
The paper concerns the problem of minimization of the compliance of linear elastic structures made of an isotropic material. The bulk and shear moduli are the design variables, both viewed as non-negative fields on the design domain. The design variables are subject to the isoperimetric condition which is the upper bound of two kinds of Lp-norms of the elastic moduli. The case of p=1 corresponds to the original concept of the Isotropic Material Design (IMD) method proposed in the paper: S. Czarnecki, Isotropic material design, Computational Methods in Science and Technology, 21 (2), 49–64, 2015. In the present paper the IMD method will be extended by assuming the Lp -norms-based cost conditions. In each case the optimum design problem is reduced to the pair of mutually dual problems of the mathematical structure of a theory of elasticity of an isotropic body with nonlinear power-law type constitutive equations. Both the states of stress and strain determine the optimal layouts of the bulk and shear moduli of the least compliant structure. The new methods proposed deliver both the lower and upper estimates of the optimal compliance predicted by the original IMD method.
