Periodic Inclusion Matrix Microstructures with Constant Field Inclusions
by
Liping Liu, Richard D. James and Perry H. Leo
in
Metallurgical Transactions A, , 2007.
Category: Preprint
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Abstract:
We find a class of special microstructures consisting of a periodic array of inclusions, with the special property that constant magnetization (or eigenstrain) of the inclusion implies constant magnetic field (or strain) in the inclusion. The resulting inclusions, which we term E-inclusions, have the same property in a finite periodic domain as ellipsoids have in infinite space. The E-inclusions are found by mapping the magnetostatic or elasticity equations to a constrained minimization problem known as a free-boundary obstacle problem. By solving this minimization problem, we can construct families of E-inclusions with any prescribed volume fraction between zero and one. In two-dimensions our results coincide with the microstructures first introduced by Vigdergauz [1, 2], while in three-dimensions we introduce a numerical method to calculate E-inclusions. E-inclusions extend the important role of ellipsoids in calculations concerning phase transformations and composite materials.
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