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Optimizing fiber orientation in fiber-reinforced materials using efficient upscaling

 
: Frei, S.; Andrä, H.; Pinnau, R.; Tse, O.

:

Computational Optimization and Applications 62 (2015), No.1, pp.111-129
ISSN: 0926-6003
ISSN: 1573-2894
English
Journal Article
Fraunhofer ITWM ()

Abstract
We present an efficient algorithm to find an optimal fiber orientation in composite materials. Within a two-scale setting fiber orientation is regarded as a function in space on the macrolevel. The optimization problem is formulated within a function space setting which makes the imposition of smoothness requirements straightforward and allows for rather general convex objective functionals. We show the existence of a global optimum in the Sobolev space H1(). The algorithm we use is a one level optimization algorithm which optimizes with respect to the fiber orientation directly. The costly solve of a big number of microlevel problems is avoided using coordinate transformation formulas. We use an adjoint-based gradient type algorithm, but generalizations to higher-order schemes are straightforward. The algorithm is tested for a prototypical numerical example and its behaviour with respect to mesh independence and dependence on the regularization parameter is studied.

: http://publica.fraunhofer.de/documents/N-300653.html