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A non-probabilistic reliability optimization method for composite laminates

A technology of composite material layer and optimization method, which is applied in the field of optimal design of composite material laminated board structure, can solve problems such as immaturity and waste of resources, and achieve the effects of reducing lightweight design, optimizing design, and reducing dependence

Active Publication Date: 2018-04-03
BEIHANG UNIV
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  • Application Information

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Problems solved by technology

At present, the relevant research work is still immature, and for the composite laminate structure, it causes serious waste of resources

Method used

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  • A non-probabilistic reliability optimization method for composite laminates
  • A non-probabilistic reliability optimization method for composite laminates
  • A non-probabilistic reliability optimization method for composite laminates

Examples

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Embodiment

[0051] In order to understand more fully the characteristics of the invention and its applicability to engineering practice, the present invention aims at such as figure 2 In-plane compressive load N x and N y The laminates are optimized based on reliability. Laminate layering method is [0 / 45 / -45 / 90] s ,Such as image 3 . The in-plane dimension of the laminate is a×b=(20*12.5)cm 2 , the thickness of the single-layer board is 0.125mm, so the total thickness of the laminated board is 0.125mm×8=1mm. The table gives the uncertainty information of the rectangular plate structure in the examples. The elastic constants and load parameters of the single-layer plate are as follows:

[0052] E. 1 =181.0GPa,E 2 =10.8GPa,G 12 =7.17Gpa, υ=0.28, N x =400kN / m, N y =72kN / m

[0053] Table 1

[0054]

[0055] This embodiment employs, reliability applications such as Figure 4 The strength reliability of the shown Tsai-Hill interval is obtained. The shaded area in the figure i...

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Abstract

The method discloses a method for non-probability reliability optimization of a composite laminated plate. The method comprises the steps that firstly, according to force bearing characteristics of the composite laminated plate and with consideration of uncertainty effects of material fiber strength under limited samples, a non-probability reliability assessment model of the composite laminated plate is established based on non-probability reliability theories; and a gradient optimization method is further adopted, a light weight is taken as a goal, reliability is taken as a constraint, a paving layer thickness is taken as an optimization variable, and a composite paving layer scheme which can satisfy certain reliability requirements can be obtained through iterations. The method has the advantages that the composite laminated plate can have the high reliability and the light weight under uncertainty conditions; and safety and economic efficiency are also ensured.

Description

technical field [0001] The present invention relates to the technical field of optimization design of composite material laminate structure, in particular to a non-probabilistic reliability design method of biaxially loaded laminate structure. Under the requirements, the thickness of the laminated board is optimized. Background technique [0002] Composite materials are materials with new properties composed of two or more different materials using physical and chemical methods on a macro scale. Generally, the performance of composite materials is better than that of its component materials, and some properties are the same as those of the original components. What the material does not have, the composite material improves the mechanical properties such as stiffness and strength of the component materials. [0003] Composite materials are widely used in aerospace, automobile, machinery and other fields due to their excellent properties. These fields have very high require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/367G06F2111/04G06F2113/24
Inventor 邱志平李晓王晓军王磊石庆贺马雨嘉
Owner BEIHANG UNIV
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