Transverse isotropy fiber material performance prediction method based on micro-mechanical model

A technology of transversely isotropic and fiber materials, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as too small fiber size, difficult fiber material properties, etc.

Active Publication Date: 2015-04-22
BEIHANG UNIV
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Problems solved by technology

However, due to the small size of the fibers, it is difficult to obtain the material properties of the fibers experimentally, especially when the fibers are not isotropic materials

Method used

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  • Transverse isotropy fiber material performance prediction method based on micro-mechanical model
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  • Transverse isotropy fiber material performance prediction method based on micro-mechanical model

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Experimental program
Comparison scheme
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Embodiment 1

[0084] Embodiment 1: Prediction of the material performance of T300 carbon fiber

[0085] The material properties of T300 / BSL914C unidirectional fiber reinforced composites are shown in Table 2.

[0086] Table 2 Material properties of T300 / BSL914C

[0087]

[0088] Wherein, the fiber volume fraction is 60%. The quantities with '*' are derived from the rest of the experimental values ​​based on the assumption of transverse isotropy of the material.

[0089] In addition, the material properties of the matrix are: E m = 4.0GPa and v m = 0.35. The modulus of the fiber along its length is E f1 It is 230GPa.

[0090] 1. According to the basic material performance parameters of the composite material, the material performance of the matrix and the elastic modulus in the fiber length direction, the initial value of the material performance of the transversely isotropic fiber is inverted by the Chamis formula, and the results are shown in Table 3;

[0091] Table 3 Initial val...

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Abstract

The invention relates to a transverse isotropy fiber material performance prediction method based on a micro-mechanical model. Composite basic material performance, matrix material performance and elasticity moduli in the fiber length direction serve as input parameters, the initial value of the transverse isotropy fiber material performance is acquired through inversion of the micro-mechanical theory model, and the transverse isotropy fiber material performance is acquired through calculation according to a finite element optimization method based on the micro-mechanical model. The optimization method for acquiring the transverse isotropy fiber material performance is provided, the transverse isotropy fiber material performance difficult to acquire through tests is acquired through the finite element model based on micro-mechanics, and necessary material performance parameters are provided for the micro-mechanical research of composites.

Description

technical field [0001] The invention relates to the prediction of the properties of transversely isotropic fiber materials, and is suitable for the research on the mesomechanics of composite materials, in particular to a method for predicting the properties of transversely isotropic fiber materials based on the mesomechanical model. Background technique [0002] Composite materials are more and more widely used in aerospace vehicle structures due to their advantages such as specific strength, high specific stiffness, and designable performance. force structure. The research shows that when designing and analyzing the mechanical structure of composite materials, it is very important to study the mechanical properties of composite materials themselves. [0003] In the method of studying the mechanical properties of composite materials, in addition to measuring by means of experiments, some scholars have proposed a method based on mesomechanics to predict the material properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 赵丽滨李杨张建宇刘丰睿陈玉丽
Owner BEIHANG UNIV
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