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Quarterly of Applied Mathematics

Quarterly of Applied Mathematics

Online ISSN 1552-4485; Print ISSN 0033-569X

   
 
 

 

Optimal bounds on the effective behavior of a mixture of two well-ordered elastic materials


Authors: Grégoire Allaire and Robert V. Kohn
Journal: Quart. Appl. Math. 51 (1993), 643-674
MSC: Primary 73B27; Secondary 35B27, 73K20, 73K40, 73V25
DOI: https://doi.org/10.1090/qam/1247433
MathSciNet review: MR1247433
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Abstract: We consider linearly elastic composite materials made by mixing two possibly anisotropic components. Our main hypothesis is that the Hooke’s laws of the two components be well-ordered. For given volume fractions and average strain, we present optimal upper and lower bounds on the elastic energy quadratic form. We also discuss bounds on sums of energies and bounds involving complementary energy rather than elastic energy. Our arguments are based primarily on the Hashin-Shtrikman variational principle; however, we also discuss how the same results arise from the “translation method", making use of the analysis of Milton. Our bounds are equivalent to those established by Avelleneda and closely related to the “trace bounds” established by Milton and Kohn. The optimal energy bounds, however, are presented here as the extreme values of certain convex optimization problems. The optimal microgeometries are determined by the associated first-order optimality conditions. A similar treatment for mixtures of two incompressible, isotropic elastic materials has previously been given by Kohn and Lipton.


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Article copyright: © Copyright 1993 American Mathematical Society