纺织复合材料多尺度网格划分方法

doi:10.7527/S1000-6893.2023.29180

Abstract

Abstract:

In order to solve the problem of distortion， interference and sharpening caused by irregular cross-sectional yarn shape and material boundaries， a mesh method and unit splitting mechanism for textile composites based on fabric microstructure are proposed. In this method， the point cloud of fabric unit-cell micro-geometry is established by textile modeling software DFMA. Based on the structural point cloud， the yarn path and cross-sectional shape are calculated， implementing the modified Delaunay triangulation Alpha-shape algorithm. The yarn surface mesh is then placed in and match with the voxel mesh. The periodic boundary is introduced by grid mapping. Penetration and narrow gap between yarns are eliminated. Finally， split the voxel units to ensure the continuity of the material. The mesh models of plain weave， three-dimensional integral orthogonal and interlayer orthogonal composites are generated using the proposed method. The damage initiation and evolution criteria of textile composites were established based on the strain-continuous damage criterion and exponential decay model. The mechanical properties of plain weave composites under shear load are simulated. The results show that， compared with tetrahedral and hexahedral meshing methods， the proposed mesh method is capable of more accurately restoring the internal geometry of woven composite materials， dealing with sharp borders and complex surfaces in 2D and 3D fabric structures， and obtaining smooth yarn surfaces and clear cross-sectional shapes. The total number of meshes of the proposed mesh model is moderate， and the calculation time is only 15% of that of the TexGen model. The difference between simulation results and experimental results of shear modulus and strength is 8.93% and 3.73% respectively， which verifies the validity and reliability of the model.

Key words: textile composite, mesh generation, fabric micro-geometry, voxel grid, shear property

CLC Number:

V258

Ying MA, Ao CHEN, Congying DENG, Xiang CHEN, Sheng LU, Xianjun ZENG. A multiscale mesh generation method for textile composite[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(10): 429180-429180.

Figures/Tables 20

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划分方法	单元类型	耗时/s	单元数量/10⁵	纱线尺度纺织复合材料模型
划分方法	单元类型	耗时/s	单元数量/10⁵	织物	树脂	复合材料
方法1^［24］	六面体	5.85	1.87
方法2^［15］	四面体	95.47	22.63
方法3	六面体、四面体、三棱柱、金字塔	13.95	3.44

划分方法	经纱截面与纬纱轨迹	纬纱截面与经纱轨迹	接结经纱轨迹
样品显微图像
方法1^［24］
方法2^［15］
方法3

参数	数值
参数	纤维束复合材料	树脂
E₁₁/GPa	23.508	9.36
E₂₂=E₃₃/GPa	9.404	9.36
G₁₂=G₁₃/GPa	9.404	3.52
G₂₃/GPa	4.348	3.52
ν₁₂=ν₁₃	0.137	0.33
ν₂₃	0.312	0.33
X_1t/MPa	490.52	82
X_1c/MPa	143.93	100
X_2t=X_3t/MPa	24.7	82
X_2c=X_3c/MPa	8.2	100
S₁₂=S₁₃/MPa	68.3	50
S₂₃/MPa	68.3	50
剪切模量G/（N·mm^-1）	6	1

类型	剪切模量		剪切强度		失效应变
类型	数值/ GPa	误差/ %	数值/ MPa	误差/ %	数值	误差/ %
实验结果	3 607.8		49.39		0.013 90
Zeng 模型^［34］	3 957.26	9.69	55.85	13.08	0.017 51	25.97
本文模型	3 929.89	8.93	51.23	3.73	0.013 26	4.60

[1]	ZHENG Changsheng, LIANG Sen, CHEN Jing, LIANG Hengliang. Low-temperature co-cured high damping composites [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019, 40(8): 422721-422721.
[2]	ZHANG Chao, XU Xiwu, YAN Xue. General Periodic Boundary Conditions and Their Application to Micromechanical Finite Element Analysis of Textile Composites [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013, 34(7): 1636-1645.

A multiscale mesh generation method for textile composite

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