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Topology Optimization with Different Stress Limit in Tension and Compression
Duysinx, Pierre
1999In Bloebaum, C. (Ed.) Proceedings of the 3rd World Congress of Structural and Multidisciplinary Optimization WCSMO3
 

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Keywords :
Topology optimization; stress constraints; Raghava criterion; Ishai criterion
Abstract :
[en] This report presents new progresses in topology optimization of continuum structures with stress constraints. One principal contribution consists in the consideration of equivalent stress criteria which can generalization of von Mises criterion and which are able to take into account non equal stress limits in tension and compression. A literature review led us to consider Raghava and Ishai criteria, which include a contribution of hydrostatic pressure. With the help of these criteria topology optimization can predict more realistic designs in which structural members are able to withstand better tension loads than compression loads, or vice-versa, as it is sometimes encountered in civil engineering or in composite material design. The implementation and sensitivity analysis aspects of Raghava and Ishai criteria in the Finite Element context are presented. We also present recent advanced developments to the solution of topology problems with stress constraints like the stress constraint relaxation technique and the numerical optimization procedure based on convex approximations and dual optimizers. Finally numerical applications will show the original character of the stress based topology designs ad versus compliance designs when there are unequal stress limits or when there are more than one load case.
Disciplines :
Aerospace & aeronautics engineering
Mechanical engineering
Author, co-author :
Duysinx, Pierre  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Ingénierie des véhicules terrestres
Language :
English
Title :
Topology Optimization with Different Stress Limit in Tension and Compression
Publication date :
May 1999
Event name :
Third World Congress of Structural and Multidisciplinary Optimization (WCSMO3)
Event place :
Buffalo, United States - New York
Event date :
May 17-21, 1999
Audience :
International
Main work title :
Proceedings of the 3rd World Congress of Structural and Multidisciplinary Optimization WCSMO3
Author, co-author :
Bloebaum, C.
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