Microscopic modeling and multi-scale analysis method suitable for needled composite material

A multi-scale analysis, composite material technology, applied in 3D modeling, instrumentation, geometric CAD, etc., can solve the problems of the needling area not having periodic boundary conditions, unable to meet the needs of complex structural performance evaluation, etc., to avoid analysis Error, the effect of accurate calculation results

Pending Publication Date: 2022-07-12
BEIHANG UNIV
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Problems solved by technology

(3) How to deal with the problem that the acupuncture area does not have periodic boundary conditions
Existing continuum damage theory models or constitutive relations based on metal elastic-plastic theory cannot meet the needs of complex structural performance evaluation in engineering applications

Method used

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  • Microscopic modeling and multi-scale analysis method suitable for needled composite material
  • Microscopic modeling and multi-scale analysis method suitable for needled composite material
  • Microscopic modeling and multi-scale analysis method suitable for needled composite material

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specific Embodiment approach

[0041] like figure 1 As shown, the present invention is suitable for the mesoscopic modeling and multi-scale analysis method of acupuncture composite materials. The embodiment of the present invention adopts the C / C-SiC three-dimensional acupuncture composite material. The schematic diagram of the acupuncture process and the specific material phase composition are as follows: figure 2 As shown, the material is formed by alternately laying a first chopped fiber layer 1, a 0° non-woven fabric 2, a second chopped fiber layer 1, and a 90° non-woven fabric 3. Transfer of the planar fiber portion to the thickness direction by vertical penetration of the needle. During this process, a needling area 4 is formed. The specific embodiments of the present invention are as follows:

[0042] The first step is to carry out CT tomography test for the assessment section of the tensile standard specimen of acupuncture composite materials, and use 3D reconstruction software to obtain the re...

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Abstract

The invention relates to a mesoscopic modeling and multi-scale analysis method suitable for an acupuncture composite material, which comprises the following steps: firstly, carrying out a CT (Computed Tomography) test, measuring a structure size and obtaining characteristic parameters; and carrying out geometric division on the acupuncture region based on the general unit cell model, and establishing a mesoscopic analysis model of the acupuncture part. Secondly, for a non-needled area in the needled composite material, describing the damage behavior of the non-needled area by adopting a continuous medium damage theory; considering that a needled composite material has a complex material phase, the equivalent elastic property of a non-needled area is obtained by adopting a hierarchical modeling thought to serve as the input of a continuous medium damage theoretical model. And finally, aiming at the characteristic that the acupuncture part does not have application periodic boundary conditions, a local area volume averaging method is provided, and bidirectional transmission of mesoscopic-macroscopic cross-scale data in multi-scale analysis is realized.

Description

technical field [0001] The invention relates to the field of mechanical property evaluation of composite materials of aerospace hot-end components, and is a mesoscopic modeling and multi-scale analysis method suitable for acupuncture composite materials. Background technique [0002] Carbon fiber reinforced ceramic matrix composites are regarded as potential candidates for aerospace hot-end components such as throats and tailpipes due to their excellent mechanical properties and high temperature resistance. Due to the poor delamination resistance of laminates and the immature and high cost of weaving composite materials for large and complex structures, it is urgent to develop a material with strong delamination resistance, simple process and controllable cost. Needle-punched composites consist of alternating layers of 0° / 90° laid and chopped fibers, followed by a needling process to partially transfer the planar fibers to the thickness direction, enhancing their interlayer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/10G06F30/20G06T17/00G06F113/26G06F119/14
CPCG06F30/10G06F30/20G06T17/00G06F2113/26G06F2119/14Y02T90/00
Inventor 胡殿印刘昱刘茜王荣桥
Owner BEIHANG UNIV
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