Isogeometric topology optimization for continuum structures using density distribution function

Summary This paper will propose a more effective and efficient topology optimization method based on isogeometric analysis, termed as isogeometric topology optimization (ITO), for continuum structures using an enhanced density distribution function (DDF). The construction of the DDF involves two ste...

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Vydané v:International journal for numerical methods in engineering Ročník 119; číslo 10; s. 991 - 1017
Hlavní autori: Gao, Jie, Gao, Liang, Luo, Zhen, Li, Peigen
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Bognor Regis Wiley Subscription Services, Inc 07.09.2019
Predmet:
Basis functions
Construction
Density distribution
density distribution function
Design optimization
Distribution functions
isogeometric analysis
Laser sintering
Mathematical analysis
Numerical analysis
NURBS
Parameterization
Rapid prototyping
Smoothness
Topology optimization
ISSN:0029-5981, 1097-0207
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Shrnutí:Summary This paper will propose a more effective and efficient topology optimization method based on isogeometric analysis, termed as isogeometric topology optimization (ITO), for continuum structures using an enhanced density distribution function (DDF). The construction of the DDF involves two steps. (1) Smoothness: the Shepard function is firstly utilized to improve the overall smoothness of nodal densities. Each nodal density is assigned to a control point of the geometry. (2) Continuity: the high‐order NURBS basis functions are linearly combined with the smoothed nodal densities to construct the DDF for the design domain. The nonnegativity, partition of unity, and restricted bounds [0, 1] of both the Shepard function and NURBS basis functions can guarantee the physical meaning of material densities in the design. A topology optimization formulation to minimize the structural mean compliance is developed based on the DDF and isogeometric analysis to solve structural responses. An integration of the geometry parameterization and numerical analysis can offer the unique benefits for the optimization. Several 2D and 3D numerical examples are performed to demonstrate the effectiveness and efficiency of the proposed ITO method, and the optimized 3D designs are prototyped using the Selective Laser Sintering technique.
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ISSN:0029-5981
1097-0207
DOI:10.1002/nme.6081