Design method of composite material laminates with equal thickness

A technology of composite materials and design methods, applied in computing, special data processing applications, instruments, etc.

Inactive Publication Date: 2015-06-10
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of this method has certain limitations, it is only suitable for 4 fixed laying angles, and laminates with up to 100 layers are used for layup design

Method used

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  • Design method of composite material laminates with equal thickness
  • Design method of composite material laminates with equal thickness
  • Design method of composite material laminates with equal thickness

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Embodiment Construction

[0052] In order to make the ply optimization design of composite laminates practically applicable to engineering practice, this embodiment proposes a design method for the ply sequence of equal-thickness plywood.

[0053] In this embodiment, using the theoretical formula of composite material mechanics, the bending stiffness coefficient is deduced to be a discrete function form of the sum of the bending stiffness coefficient components at each ply position. And the bending stiffness coefficient component function is a transcendental function about the position and the orientation angle of the position. Then, in the performance optimization of the first stage, the initial ply group sequence of the laminate was set, and the ply group sequence is the ply sequence in which the plies of each laying angle are placed together consecutively. According to the performance optimization of the first stage, the continuous variable thickness of each laying corner layer group was obtained, a...

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Abstract

The invention discloses a design method of composite material laminates with equal thickness. The design method comprises the following steps: establishing an optimal object through an optimization model; constructing a basic ply stacking structure meeting an engineering constraint according to an initial ply group sequence set in the performance optimization of the first stage; with the reference of the initial ply layer group sequence set in the first stage, sequentially adding plies under a principle of enabling D11, D22, D12 and D66 to be maximized according to the basic ply stacking structure, and adding plies of all the stacking corners into the basic ply stacking structure, so as to obtain the laminate ply stacking sequence basically meeting the engineering constraint; eliminating the plies stacked, and detecting whether the laminates subjected to ply elimination meet the performance constraint of the optimization model or not, so as to obtain the optimized ply stacking sequence of the laminates. With adoption the theoretic design method disclosed by the invention, designers can solve the complicated optimizing problem of the laminate ply stacking sequence, and can quickly find out the optimal solution of the laminate ply stacking sequence.

Description

technical field [0001] The invention is applicable to the layering design of composite material laminated boards, and in particular relates to a method for designing the layering sequence of equal-thickness composite material laminated boards. Background technique [0002] The lightest weight is the goal in the engineering design of the composite material structure, which needs to meet the mechanical performance requirements and engineering manufacturing constraints at the same time. In the optimization design of composite material structure, in order to make the structure meet the above two requirements at the same time: in the first stage, the finite element software is used to model the structure and the numerical optimization method is used to optimize the design. Angular thickness is in the form of continuous variables, but due to the characteristics of discrete layup of laminates, this result cannot be directly applied to engineering manufacturing; design. In the des...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 景钊孙秦
Owner NORTHWESTERN POLYTECHNICAL UNIV
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