Composite laminate structure non-probabilistic reliability topological optimization method based on interval uncertainty

Abstract

The invention discloses a composite laminated plate structure non-probabilistic reliability topological optimization method based on interval uncertainty. The method comprises the following steps: firstly, acquiring a unit elastic matrix of a composite material laminated plate through a first-order shear deformation theory so as to obtain laminated plate material properties under different lamination angles and thicknesses; considering uncertainty of parameters such as an external load, a material attribute and a rigidity allowable value, and establishing a non-probability reliability index based on an interval set reliability model; solving the sensitivity of the non-probabilistic reliability to a design variable by utilizing an adjoint vector method; and updating the design variable by applying an MMA algorithm based on gradient information, and performing iterative optimization until the optimal topological configuration is obtained. According to the method, the comprehensive influence of uncertainty on structural configuration is reasonably represented in the topological optimization process of the composite laminated plate structure, and the light weight, safety performance and economy of the structure are all effectively improved.

Description

technical field [0001] The invention relates to the technical field of topology optimization design of composite laminate structures, in particular to a non-probabilistic topology optimization method for composite laminate structures based on interval uncertainty, which considers the elastic modulus of composite materials, load magnitude and displacement allowable value The interval uncertainty of , based on the non-probabilistic reliability index d j Under the constraints of , the topology optimization of the composite laminate structure is carried out. Background technique [0002] Because composite materials have excellent properties such as good thermal stability, specific strength, and high specific stiffness, they have been widely used in many fields such as aerospace, machinery, and automobiles. The advantages of composite materials are particularly evident in the aerospace field. The aerospace field has strict requirements on the structural weight, because the stru...

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Problems solved by technology

In this case, although the exact probability distribution data of uncertain parameters cannot be obtained, the bounds of parameter uncertainty are easy to determine

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