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Amstutz, Samuel; Novotny, Antonio A.; De Souza Neto, Eduardo Alberto

Topological derivative-based topology optimization of structures subject to Drucker-Prager stress constraints. (English) Zbl 1253.74078

Comput. Methods Appl. Mech. Eng. 233-236, 123-136 (2012).
Summary: An algorithm for topology optimization of elastic structures under plane stress subject to the Drucker-Prager stress constraint is presented. The algorithm is based on the use of the topological derivative of the associated objective functional in conjunction with a level-set representation of the structure domain. In this context, a penalty functional is proposed to enforce the point-wise stress constraint and a closed formula for its topological derivative is derived. The resulting algorithm is of remarkably simple computational implementation. It does not require post-processing procedures of any kind and features only a minimal number of user-defined algorithmic parameters. This is in sharp contrast with current procedures for topological structural optimization with local stress constraints. The effectiveness and efficiency of the algorithm presented here are demonstrated by means of numerical examples. The examples show, in particular, that it can easily handle structural optimization problems with underlying materials featuring strong asymmetry in their tensile and compressive yield strengths.

Cited in 31 Documents

MSC:

74P15 Topological methods for optimization problems in solid mechanics
49Q12 Sensitivity analysis for optimization problems on manifolds

Keywords:

topological sensitivity; topological derivative; topology optimization; Drucker; Prager criterion; local stress constraint; Genesis

Software:

GENESIS; HYPLAS; OptiStruct
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References:

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