2.5D机织浅交弯联复合材料数字单元建模分析

doi:10.7527/S1000-6893.2023.27478

Abstract

Abstract:

2.5D woven shallow cross bending composites have been widely used in aerospace structures because of their excellent mechanical properties and structural integrity. Correctly characterizing the fiber structure with extrusion or deflection deformation is the key to studying the materials properties in the micro- and meso-scale. The digital element method is an effective way to simulate the internal fiber bundle shape of the woven composites； however， the obtained results depend on the selection of the simulation parameters. Based on the Micro Computed Tomography（Micro-CT） observation of 2.5D woven shallow cross bending SiO_2f/ SiO₂ composites， a digital element finite element model of the materials is established using the Abaqus software. The temperature load and boundary constraints are applied to the simulation of the fabric deformation process， and the digital element characteristic information after fabric deformation is extracted. Combining the central path and cross-section shape discretization algorithm of the fiber bundles， we obtain the structural shape of the fiber bundles. Analysis of the influences of the selected element type， the elastic properties of the digital element， the number of elements and the friction coefficient on the simulation results determines the main selection principles of the simulation parameters. A geometric model that can reflect the yarn deformation characteristics of the woven composites is obtained， which is consistent with the CT observation results. This method is universal and can guide the digital element modelling of similar fabric composites.

Key words: woven composites, digital element, Micro CT slices, high-fidelity model, geometry reconstruction

CLC Number:

V258

Hongyue WANG, Bing WANG, Guodong FANG, Songhe MENG. Digital element modelling and analysis of 2.5D woven shallow cross bending composites[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(9): 227478-227478.

Figures/Tables 22

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纱线类型	长/mm	宽/mm	横间距/mm	纵间距/mm
经纱	1.9±0.12	0.668±0.046	5.5±0.95	0.89±0.074
纬纱	1.1±0.06	0.384±0.034

纱线类型	面积/mm²	杆单元面积/mm²	数量
纬纱	0.996 8	0.013	61
经纱	0.422 4	0.069	63
增强纱	0.080 0	0.077	10

设置		具体参数
材料属性	密度/（kg·m^-3）	经纱：2 200；纬纱：4 400
材料属性	模量/MPa	经纱：1.65；纬纱：3.00
质量放缩		低于最小值时为4×10^-5
阻尼系数		质量阻尼α=0.15
阻尼系数		刚度阻尼β=0
接触设置		硬接触

[1]	Yang SUN, Jian HUANG, Chenchen HAN, Zhenqiang ZHAO, Haili ZHOU, Fangfang SUN, Chao LI, Chao ZHANG, Liquan ZHANG. Comparison of in-plane mechanical properties of 2D and 3D woven composites [J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(18): 428267-428267.
[2]	Zhou Chuwei. Visco-elastic Meso Beam Model of 3D Woven Composites [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2009, 30(2): 283-289.
[3]	WANG Li-peng;YAN Ying;ZENG Dong;WANG Guo-ping. Experimental Study on Stiffness, Strength and Low-Speed Impact Performance of Mixed Woven Composites [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2006, 27(5): 851-855.

Digital element modelling and analysis of 2.5D woven shallow cross bending composites

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