缎纹编织复合材料紧固件拉拔试验及数值模拟

边天涯; 关志东; 刘发齐

doi:10.13700/j.bh.1001-5965.2016.0137

缎纹编织复合材料紧固件拉拔试验及数值模拟

doi: 10.13700/j.bh.1001-5965.2016.0137

北京航空航天大学航空科学与工程学院, 北京 100083

详细信息

作者简介:
边天涯,男,博士研究生。主要研究方向:复合材料结构设计

关志东,男,博士,教授,博士生导师。主要研究方向:飞机结构损伤容限设计,复合材料结构设计,飞机结构修理设计

通讯作者:
关志东,E-mail:d5062010@163.com

中图分类号: V257;TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2016-02-23
- 录用日期: 2016-05-20
- 网络出版日期: 2017-02-20

Tensile test and numerical simulation for satin weave composite fastener

School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

More Information

Corresponding author: GUAN Zhidong,E-mail:d5062010@163.com

摘要

摘要:
缎纹编织复合材料紧固件中螺牙细节尺寸已达到细观尺度量级，若在数值模拟过程中对于螺牙采用统一的材料属性，则不能准确地模拟其真实失效模式。针对此问题，建立的紧固件螺牙有限元模型是由若干层简化缎纹编织复合材料细观结构代表体积单元堆叠而成，如此模型可包含必要的纤维分区和基体分区。对螺牙模型进行拉拔试验模拟，并基于各组分材料的失效判据，实现对紧固件破坏载荷的预报。完成了缎纹编织碳/碳复合材料单螺牙紧固件拉拔试验。模拟失效模式与真实失效模式吻合良好，二者破坏载荷误差为5.17%，验证了有限元模型的合理性。
- 碳/碳复合材料 /
- 紧固件 /
- 织物 /
- 有限元方法 /
- 失效分析
Abstract:
Detailed sizes of threads in the satin weave composite fastener have reached the meso scale. It is not accurate to simulate the real failure mode if the uniform material is applied to the thread in the process of numerical simulation. For this problem, the finite element model of the fastener thread is established by stacking several layers of simplified satin weave composite meso-structure representative volume elements, which results in that the model includes essential fiber region and matrix region. Numerical simulation for the tensile test of thread model is carried out. Based on the failure criterion of each component material, prediction on the damage force of fastener is achieved. Tensile test for the satin weave carbon/carbon composite single thread fastener are accomplished. Good agreement between simulated failure mode and real damage mode is observed and the error of damage forces between the both methods is 5.17%, which verifies the rationality of the finite element model.
- carbon/carbon composite /
- fastener /
- fabric /
- finite element method /
- failure analysis

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图 1 8枚缎纹编织复合材料单胞

Figure 1. RVE of 8-harness satin weave composite

下载: 全尺寸图片幻灯片

图 2 缎纹编织碳/碳复合材料紧固件

Figure 2. Satin weave carbon/carbon composite fastener

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图 3 缎纹编织碳/碳复合材料试验件加工方向示意图

Figure 3. Schematic diagram of processing direction of satin weave carbon/carbon composite specimen

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图 4 紧固件拉拔试验夹具

Figure 4. Fixture of fastener tensile test

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图 5 试验载荷-位移曲线

Figure 5. Force-displacement curve of test

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图 6 缎纹编织碳/碳复合材料单牙紧固件试验后照片

Figure 6. Photographs of satin weave carbon/carbon composite single thread fastener after test

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图 7 缎纹编织简化单胞有限元模型

Figure 7. Finite element model of simplified satin weave RVE

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图 8 螺牙及螺母有限元模型

Figure 8. Finite element models of thread and nut

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图 9 螺牙及螺母有限元网格

Figure 9. Finite element grids of thread and nut

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图 10 碳布单元受力状态^[22]

F—碳布单元受力；σ_f1—上层纤维束1方向正应力；σ_f2—下层纤维束2方向正应力；σ_m1, σ₁—上层和下层基体1方向正应力；σ_m2, σ₂—下层和上层基体2方向正应力。

Figure 10. Forced state of carbon cloth element^[22]

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图 11 螺牙失效分布图

Figure 11. Failure distribution of thread

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图 12 试验和有限元方法载荷-位移曲线

Figure 12. Force-displacement curves of test and FEM

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表 1 缎纹编织复合材料单胞几何参数^[16]

Table 1. Geometric parameters of satin weave composite RVE^[16]

几何参数	数值
单胞宽度/mm	10.40
单胞厚度/mm	0.46
经纬向纤维束宽度/mm	0.60
经纬向纤维束高度/mm	0.20
穿刺纤维束横截面直径/mm	0.58

下载: 导出CSV

表 2 缎纹编织碳/碳复合材料试验件尺寸

Table 2. Sizes of satin weave carbon/carbon composite specimen

几何尺寸	数值
螺牙间距/mm	1.5
螺牙顶角/(°)	60
螺牙高度/mm	1.3
光杆直径/mm	10

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表 3 T300纤维材料力学性能^[20]

Table 3. Mechanical properties of T300 fiber^[20]

性能参数	数值
纵向弹性模量E_f1/GPa	230
横向弹性模量E_f2/GPa	15
纵横剪切模量G_f12/GPa	15
纵横主泊松比ν_f21	0.2
横向剪切模量G_f23/GPa	7
横向泊松比ν_f23	0.07
纵向拉伸强度X_fT/MPa	2 500
纵向压缩强度X_fC/MPa	2 000

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表 4 无孔隙碳基体材料力学性能

Table 4. Mechanical properties of pure carbon matrix

性能参数	数值
弹性模量E_m/GPa^[16]	9.254
泊松比ν_m^[16]	0.23
剪切强度/MPa^[15]	37.6

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表 5 缎纹编织碳/碳复合材料单牙紧固件拉拔试验结果

Table 5. Results of satin weave carbon/carbon composite single thread fastener tensile test

试验名称	破坏载荷/N
单牙螺钉拉拔	905.70

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表 6 碳布有效力学性能

Table 6. Effective mechanical properties of carbon cloth

性能参数	数值
面内弹性模量/GPa	58.4
面内泊松比	0.010 5
面内剪切模量/GPa	5.41
离面弹性模量/GPa	12.2
离面泊松比	0.18
离面剪切模量/GPa	7.44

下载: 导出CSV

表 7 螺母有效力学性能

Table 7. Effective mechanical properties of nut

性能参数	数值
螺母弹性模量/GPa^[16]	39.92
螺母泊松比	0.05

下载: 导出CSV

表 8 试验和有限元方法破坏载荷

Table 8. Damage forces of test and FEM

试验名称	破坏载荷
试验名称	试验/N	FEM/N	误差/%
单牙螺钉拉拔	905.70	858.86	5.17

下载: 导出CSV

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