Accession Number : ADA623814


Title :   Multiobjective Topology Optimization of Energy Absorbing Materials


Descriptive Note : Journal article


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE


Personal Author(s) : Wildman, Raymond A ; Gazonas, George A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a623814.pdf


Report Date : Aug 2015


Pagination or Media Count : 24


Abstract : A method for the multiobjective optimization of local-scale material topology is presented. The topology optimization scheme is based on a constructive solid geometry-like representation, in which convex polygons---defined as the convex hull of arbitrary-length lists of points---are combined using an overlapping function. This data structure is tree-shaped and so genetic programming is used as the optimizer. The forward problem is solved with a multiscale finite element method with automatic cohesive zone insertion to model damage. As a multiscale method, loads and boundary conditions are applied and objective functions measured at a global scale, while the local scale material structure is optimized. The global scale geometry is assumed fixed. Pareto optimal designs are generated, representing optimal tradeoffs between conflicting goals: quasi-static displacement and dynamic strain energy. Results demonstrate the efficacy of the proposed algorithm.


Descriptors :   *ABSORBERS(MATERIALS) , *TOPOLOGY , ALGORITHMS , CONVEX BODIES , DISPLACEMENT , FINITE ELEMENT ANALYSIS , GEOMETRY , OPTIMIZATION , POLYGONS , PROBLEM SOLVING , REPRINTS


Subject Categories : Theoretical Mathematics


Distribution Statement : APPROVED FOR PUBLIC RELEASE