Stiffness optimization of geometrically nonlinear structures and the level set based solution

• Published in: International journal for simulation and multidisciplinary design optimization Vol. 7; p. A3
• Main Authors: Xia, Qi, Shi, Tielin
• Format: Journal Article
• Language: English
• Published: Les Ulis EDP Sciences 2016
• Subjects: Finite element method; Geometrically nonlinear; Kreisselmeier-Steinhauser function; Level set method; Stiffness; Topology optimization
• ISSN: 1779-627X; 1779-6288; 1779-6288
• DOI: 10.1051/smdo/2016002

Load-normalized strain energy increments between consecutive load steps are aggregated through the Kreisselmeier-Steinhauser (KS) function, and the KS function is proposed as a stiffness criterion of geometrically nonlinear structures. A topology optimization problem is defined to minimize the KS function together with the perimeter of structure and a volume constraint. The finite element analysis is done by remeshing, and artificial weak material is not used. The topology optimization problem is solved by using the level set method. Several numerical examples in two dimensions are provided. Other criteria of stiffness, i.e., the end compliance and the complementary work, are compared.