Non-probabilistic reliability-based topology optimization of geometrically nonlinear structures using convex models

This paper describes a non-probabilistic reliability-based topology optimization method for the design of continuum structures undergoing large deformations. The variation of the structural system is treated with the multi-ellipsoid convex model, which is a realistic description of the parameters be...

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Vydáno v:Computer methods in applied mechanics and engineering Ročník 198; číslo 41; s. 3228 - 3238
Hlavní autoři: Kang, Zhan, Luo, Yangjun
Médium: Journal Article
Jazyk:angličtina
Vydáno: Kidlington Elsevier B.V 01.09.2009
Elsevier
Témata:
Computational techniques
Convex model
Exact sciences and technology
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Geometrical nonlinearity
Mathematical methods in physics
Non-probabilistic reliability
Physics
Solid mechanics
Static elasticity (thermoelasticity...)
Structural and continuum mechanics
Topology optimization
Uncertainty
Topology optimization
Uncertainty
Convex model
Geometrical nonlinearity
Non-probabilistic reliability
High strain
Displacement(deformation)
Modeling
Optimal design
Uncertain system
Gradient method
Geometrical shape
Sensitivity analysis
Probabilistic approach
Rupture
Minimization
Adjoint method
Large displacement
Topology
Constrained optimization
Stochastic programming
Design process
Structure modification
Reliability
Ellipsoid
Convex analysis
Structural analysis
ISSN:0045-7825, 1879-2138
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Shrnutí:This paper describes a non-probabilistic reliability-based topology optimization method for the design of continuum structures undergoing large deformations. The variation of the structural system is treated with the multi-ellipsoid convex model, which is a realistic description of the parameters being inherently uncertain-but-bounded or lacking sufficient probabilistic data. The formulation of the optimal design is established as a volume minimization problem with non-probabilistic reliability constraints on the geometrically nonlinear structural behaviour. In order to circumvent numerical difficulties in solving the nested double-loop optimization problem, a performance measure-based approach is employed to transform the constraint on the reliability index into one on the concerned performance. In conjunction with an efficient adjoint variable scheme for the sensitivity analysis of reliability constraints, the optimization problem is solved by gradient-based mathematical programming methods. Three numerical examples for the optimization design of planar structures are presented to illustrate the validity and applicability of the proposed method. The obtained optimal solutions show the importance of incorporating various uncertainties in the design problem. Moreover, it is also revealed that the geometrical nonlinearity needs to be accounted for to ensure satisfaction of the reliability constraints in the optimal design of structures with large deformation.
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ISSN:0045-7825
1879-2138
DOI:10.1016/j.cma.2009.06.001