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An optimal design method for composite structure reliability considering load and material dispersion

A composite material and optimization design technology, which is applied in the testing, calculation, and testing of mechanical components of machines/structural components. Effect

Active Publication Date: 2018-07-03
BEIHANG UNIV
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Problems solved by technology

Conventional optimization design uses fixed values ​​as design variables, does not take into account the actual uncertainty of load and material strength parameters, and only uses a general safety factor to describe the dispersion and randomness of various objective parameters

Method used

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  • An optimal design method for composite structure reliability considering load and material dispersion
  • An optimal design method for composite structure reliability considering load and material dispersion
  • An optimal design method for composite structure reliability considering load and material dispersion

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Embodiment

[0048] 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 The shown composite laminate structure is designed for reliability optimization considering the load and material dispersion. In this embodiment, the 8-layer CF / EP quasi-isotropic board is considered, the 8-layer single-layer board is symmetrically distributed, and half of the board is [0 / +θ° / -θ° / 90°], here is the calculation Simple, consider θ=45, subject to N x =200N / mm, N y =150N / mm, N xy =50N / mm load action, apply the maximum stress criterion and the failure criterion of the first layer, constrain the reliability of the entire laminate under the safety factor method, and take the ply thickness of the single-ply ply as the design variable, where the single ply ply in the same ply direction With the same thickness, optimized with the goal of structural quality of the entire laminate. The performance p...

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Abstract

The invention discloses a composite material structure reliability optimum design method considering loads and material dispersion. The method includes the steps that (1) according to the characteristics of a composite material structure, the B-basis material strength allowable value of the structure is determined by considering the material dispersion; (2) the load amplification coefficient in engineering design is utilized for conducting design by considering the uncertainty effect of the loads in the structure; (3) with the maximum stress criterion as the standard of judging whether a single-layer board structure is damaged or not, the reliability of single-layer boards is calculated with the first-order second-moment method, and then the total reliability index of a system is solved; (4) according to the optimum design theory of the composite material structure, a multi-objective optimization model is established with the laying angle and thickness of the composite material as design variables, the condition of guaranteeing that the structure has reliability not lower that the system reliability calculated before as the constraint, and the lightest weight of the structure as the objective. Thus, structural reliability optimization of the composite material structure under the design method considering the load amplification coefficient and the material B-basis value is achieved.

Description

technical field [0001] The invention relates to the field of composite material structure optimization design, in particular to a composite material structure reliability optimization design method considering load and material dispersion. Background technique [0002] Composite materials are composed of high-strength, low-density fiber materials and matrix, and have many characteristics that other materials do not have, such as high specific strength, specific stiffness, good fatigue performance, thermal insulation and anisotropy, etc. Its application range is wider and wider. However, the mechanical properties of composite materials are closely related to their processing and manufacturing processes, and the dispersion of their material properties is large. Therefore, it is very necessary to analyze the structural reliability of composite materials considering uncertain factors. At the same time, when the composite material structure material is selected, how to design th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00G01M13/00
CPCG01M13/00G16Z99/00
Inventor 王晓军樊维超王睿星王磊蒋文婷
Owner BEIHANG UNIV
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