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Self-adaption unit analyzing method for performance of three-dimensional woven compound material

A technology of self-adaptive cells and composite materials, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as effective prediction of gradient performance and few analysis methods

Active Publication Date: 2013-02-20
NANJING FIBERGLASS RES & DESIGN INST CO LTD
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Problems solved by technology

However, there are very few effective prediction and analysis methods for its gradient performance.

Method used

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  • Self-adaption unit analyzing method for performance of three-dimensional woven compound material
  • Self-adaption unit analyzing method for performance of three-dimensional woven compound material
  • Self-adaption unit analyzing method for performance of three-dimensional woven compound material

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Embodiment Construction

[0057] 1. Define the element of special-shaped cross-section 3D braided composite material——adaptive element

[0058] Based on the research on the three-dimensional weaving process and the internal mesoscopic geometry of materials, an adaptive element method for describing the gradient properties of three-dimensional braided composite materials is proposed. Different from the traditional unit cell method, the unit that changes with the structure of the three-dimensional braided composite material with special-shaped cross-section is defined as an adaptive unit (as shown in Figure 1). Assume that the ternary function enclosed by an adaptive unit inside the dimensional braided composite member in the space area E is f(x, y, z), and the function f(x, y, z) is continuous on the area E, and its volume for:

[0059] u z =∫∫∫ E f(x,y,z)dzdydx

[0060] 2. Equivalent the adaptive unit to the cuboid unit

[0061] It is assumed that the properties μ(x, y, z) of the three-dimensional...

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Abstract

The invention relates to a self-adaption unit analyzing method for performance of a three-dimensional woven compound material. The self-adaption unit analyzing method comprises the following steps of: 1) defining a unit of a three-dimensional woven compound material with an abnormal section, namely a self-adaption unit; 2) equalizing the self-adaption unit to be a cuboid unit; 3) determining the volume percentage composition of whole fibers of the three-dimensional woven compound material with the abnormal section based on a self-adaption unit method; and 4) analyzing the elastic performance of the three-dimensional woven compound material with the abnormal section based on the self-adaption unit method. Aiming at the gradient of the performance of the three-dimensional woven compound material with the abnormal section, the invention provides the self-adaption unit capable of accurately predicating the performance and an equal method for accurately predicating the performance; and the invention provides a step length control method for digitally describing the performance, namely a model calculation precision can be improved through thinning step lengths of different coordinate directions. Compared with a predication model based on a single-cell method, the self-adaption unit analyzing method has the advantages that the problem of predicating the performance of the three-dimensional woven compound material with a complicated geometrical shape is effectively solved and the predication precision is higher.

Description

technical field [0001] The invention relates to a method for analyzing the performance of a special-shaped three-dimensional braided material, in particular to an adaptive unit analysis method for the performance of a three-dimensional braided composite material based on a mesoscopic unit structure. Background technique [0002] Three-dimensional braided composites have attracted extensive attention in industries such as aerospace, national defense, and medical treatment due to their excellent mechanical properties, and special-shaped three-dimensional braided composites have been widely used in the above fields. However, there are very few effective prediction and analysis methods for its gradient performance. Contents of the invention [0003] The task of the present invention is to provide an adaptive element analysis method for the performance of special-shaped three-dimensional braided composite materials. [0004] The applicant has found through research that the pe...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 朱建勋马文锁李天兴唐亦囡
Owner NANJING FIBERGLASS RES & DESIGN INST CO LTD
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