Composite material structure reliability optimum design method considering loads and material dispersion

A composite material and optimization design technology, which is applied in the testing and calculation of machine/structural parts, testing of mechanical parts, etc., can solve the problems of not accurately considering the uncertainty of load and material strength parameters, etc., and achieve optimal structural performance Effect

Active Publication Date: 2017-05-31
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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  • Composite material structure reliability optimum design method considering loads and material dispersion
  • Composite material structure reliability optimum design method considering loads and material dispersion
  • Composite material structure reliability optimum design method considering loads and material dispersion

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Embodiment

[0048] In order to fully understand the characteristics of the invention and its applicability to engineering practice, the present invention aims at figure 2 The composite laminate structure shown in consideration of load and material dispersion is designed for reliability optimization. In this embodiment, an 8-layer CF / EP quasi-isotropic board is considered, and the 8-layer single-layer board is symmetrically distributed, and half of the board is laid [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, the reliability of the entire laminate under the safety factor method is the constraint, and the thickness of the single-layer board is the design variable, and the single-layer board in the same lay direction Have the same thickness and optimize the structural quality of the entire laminate. Known single-layer board perf...

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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, better fatigue performance, thermal insulation and anisotropy, etc. Its application range is getting wider and wider. However, the mechanical properties of composite materials are closely related to their processing and manufacturing processes, and the dispersion of material properties is relatively large. Therefore, the reliability analysis of composite material structures considering uncertain factors is very necessary. At the same time, when the composite material structure material is selected, how to desig...

Claims

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Application Information

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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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