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Parameter hierarchy sensitivity analysis method for fiber reinforced composite material

A technology of sensitivity analysis and composite materials, applied in the field of parameter level sensitivity analysis of fiber reinforced composite materials, which can solve problems such as inability to solve research difficulties

Inactive Publication Date: 2020-04-17
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the defect that the prior art cannot solve the above two research difficulties, the present invention proposes a layered sensitivity analysis method for fiber-reinforced composite material parameters

Method used

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  • Parameter hierarchy sensitivity analysis method for fiber reinforced composite material
  • Parameter hierarchy sensitivity analysis method for fiber reinforced composite material
  • Parameter hierarchy sensitivity analysis method for fiber reinforced composite material

Examples

Experimental program
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Embodiment Construction

[0043] Such as figure 1 As shown, it is a kind of fiber reinforced composite material parameter level sensitivity analysis method involved in this embodiment, which includes the following steps:

[0044] Step 1. For 3D woven carbon fiber composite materials, firstly define the model and hierarchical structure of each scale: each scale model is as follows: figure 2 As shown, there are two levels of models including the L1 level and the L2 level. There are three sub-models at the L1 level, which are the sub-models of the fiber and the matrix with respect to the warp, weft and binding yarns; the L2 level is about the warp, weft and binding yarns. The sub-model of the unit cell; the hierarchical structure corresponding to the three-dimensional woven carbon fiber multi-scale composite material model is as follows image 3 As shown, then define the input and output of each scale model, and determine the input, output and the probability density function of the input. image 3 The...

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Abstract

The invention discloses a parameter hierarchy sensitivity analysis method for a fiber reinforced composite material. The method comprises the steps that sub-models of all levels of a fiber reinforcedcomposite multi-scale model are determined, a microscopic-mesoscopic scale index is obtained by material parameter sensitivity analysis through a microscopic-mesoscopic scale model, and then a mesoscopic-macroscopic scale index and an independent conversion variable are obtained by material parameter sensitivity analysis through a mesoscopic-macroscopic scale model; based on sensitivity analysis,sensitivity indexes of the microscopic material parameters and the independent conversion variables are obtained; and finally, a linear regression coefficient is obtained through linear regression, the indexes are integrated to obtain a sensitivity index of the whole fiber reinforced composite material multi-scale model, and the influence degree of the sensitivity index on material parameters is effectively evaluated. The method has important significance and practical value for improving the design efficiency of a new material, shortening the design period and quickly and effectively carryingout a material design scheme.

Description

technical field [0001] The invention relates to a technology in the field of new material manufacturing, in particular to a method for analyzing the hierarchical sensitivity of fiber-reinforced composite material parameters. Background technique [0002] Fiber-reinforced composites have the advantages of low density, high specific stiffness, high specific strength, and fatigue resistance, but there are uncertainties at all scales caused by factors such as material discreteness, manufacturing process, simulation model, and operating environment. Determinism affects the macroscopic mechanical properties of fiber reinforced composites through scale transfer and interaction. The hierarchical sensitivity analysis method is of great significance and practical value to improve the design efficiency of new materials, shorten the design cycle, and quickly and effectively carry out material design schemes. [0003] There are two research difficulties in the process of realizing the h...

Claims

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Application Information

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IPC IPC(8): G01N3/00G01N3/06G16C60/00
CPCG01N3/00G01N3/06G01N2203/0075G01N2203/0096G01N2203/0214G16C60/00
Inventor 朱平许灿刘钊李钼石
Owner SHANGHAI JIAO TONG UNIV