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Structural displacement requirement in a topology optimization algorithm based on isogeometric entities. (English) Zbl 1432.74189
Summary: This work deals with the formulation of a general design requirement on the displacement of a continuum medium in the framework of a special density-based algorithm for topology optimization. The algorithm makes use of non-uniform rational basis spline hyper-surfaces to represent the pseudo-density field describing the part topology and of the well-known solid isotropic material with penalization approach. The proposed formulation efficiently exploits the properties of the isogeometric basis functions, which allow defining an implicit filter. In particular, the structural displacement requirement is formulated in the most general sense, by considering displacements on loaded and non-loaded regions. The gradient of the structural displacement is evaluated in closed form by using the principle of virtual work. Moreover, a sensitivity analysis of the optimized topology to the integer parameters, involved in the definition of the hyper-surface, is carried out. The effectiveness of the proposed approach is proven through meaningful 2D and 3D benchmarks.

74P15 Topological methods for optimization problems in solid mechanics
90C30 Nonlinear programming
90C31 Sensitivity, stability, parametric optimization
90C53 Methods of quasi-Newton type
90C90 Applications of mathematical programming
65K10 Numerical optimization and variational techniques
Full Text: DOI
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