胶层厚度对碳纤维/双马来酰亚胺树脂复合材料平-折-平混合连接接头力学性能的影响

刘志明; 许昶

doi:10.13801/j.cnki.fhclxb.20200121.003

胶层厚度对碳纤维/双马来酰亚胺树脂复合材料平-折-平混合连接接头力学性能的影响

doi: 10.13801/j.cnki.fhclxb.20200121.003

刘志明^,,
许昶

北京交通大学　机械与电子控制工程学院，北京 100044

基金项目: 十三五国家重点研发计划：车体、设备舱及转向架疲劳可靠性研究(2016YFB1200505-011)

详细信息

通讯作者:
刘志明，博士，教授，研究方向为结构疲劳及其可靠性　E-mail：zhmliu1@m.bjtu.edu.cn

中图分类号: TB331
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出版历程
- 收稿日期: 2019-11-27
- 录用日期: 2020-01-12
- 网络出版日期: 2020-01-21
- 刊出日期: 2020-11-15

Effect of adhesive thickness on mechanical properties of carbon fiber/bismaleimide resin composite flat-joggle-flat hybrid (bonded-bolted) joint

LIU Zhiming^,,
XU Chang

School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China

摘要

摘要: 以碳纤维/双马来酰亚胺(BMI)树脂复合材料平-折-平(FJF)连接接头为对象，通过试验对比分析了特定胶层厚度下碳纤维/BMI树脂复合材料FJF连接接头的静强度和疲劳性能，并探究了胶层厚度对碳纤维/BMI树脂复合材料FJF混合接头力学性能的影响。利用背面应变技术对碳纤维/BMI树脂复合材料FJF混合接头搭接区端部胶层开裂进行监测。利用有限元软件ABAQUS对不同胶层厚度下碳纤维/BMI树脂复合材料FJF混合接头搭接区胶层应力分布进行了分析。结果表明，碳纤维/BMI树脂复合材料FJF混合接头的平均拉伸极限载荷、搭接区端部胶层开裂平均循环次数和平均疲劳寿命均随着胶层厚度在0.1~0.3 mm范围内增加而增大。不同胶层厚度的碳纤维/BMI树脂复合材料FJF混合接头均经历相同的失效阶段，即搭接区胶层端部开裂，胶层沿搭接区断裂扩展，最终靠近加载端孔边拉伸断裂，呈±45°断口。随着胶层厚度在0.1~0.3 mm范围的增加，搭接区端部胶层剥离应力、剪切应力及孔边胶层压缩应力均减小。在胶层厚度为0.1~0.3 mm范围内，剪应力是胶层破坏的控制因素。
- 碳纤维 /
- 双马来酰亚胺(BMI)树脂 /
- 复合材料 /
- 平-折-平(FJF)混合连接接头 /
- 胶层厚度 /
- 静强度 /
- 疲劳寿命 /
- 胶层应力
Abstract: Experiments were carried out to compare the static strengths and fatigue behaviors of the carbon fiber/bismaleimide (BMI) resin composite flat-joggle-flat (FJF) joints under a certain adhesive thickness. Meanwhile, effects of the adhesive thickness on the mechanical properties of the carbon fiber/BMI resin composite FJF hybrid joints were explored. Backface strain technology was used to detect the adhesive cracking at the end of the overlap zone. Adhesive stress distributions in the overlap zone of the carbon fiber/BMI resin composite FJF hybrid joints were analyzed based on the ABAQUS software. The results show that the average tensile ultimate load, the average adhesive cracking cycles at the end of the overlap zone and the average fatigue life of the carbon fiber/BMI resin composite FJF hybrid joints all rise with the increasing adhesive thickness in a certain range of 0.1 mm to 0.3 mm. The carbon fiber/BMI resin composite FJF hybrid joints with different adhesive thicknesses all go through the same failure stages: Firstly the adhesive cracking happens at the end of the overlap zone, then the adhesive crack extends along the overlap zone, finally a net-tension failure occurs at the hole near the loading end, presenting the fracture appearance of ±45°. As the adhesive thickness increases within the range of 0.1 mm to 0.3 mm, adhesive peel and shear stress at the end of the overlap zone and the compressive stresses around the bolt hole all decrease. Shear stress is the main factor that accounts for the adhesive failure.
- carbon fiber /
- bismaleimide(BMI) resin /
- composite /
- flat-joggle-flat (FJF) hybrid joint /
- adhesive thickness /
- static strength /
- fatigue life /
- adhesive stress

HTML全文

图 1 碳纤维/双马来酰亚胺(BMI)树脂复合材料平-折-平(FJF)混合连接接头示意图

Figure 1. Schematic diagram of carbon fiber/bismaleimide (BMI) resin composite flat-joggle-flat (FJF) hybrid joint

d—Hole diameter; W—Width; E—Edge distance; t_a—Laminate thickness; t_c—Adhesive thickness; r₁—Larger fillet diameter; r₂—Smaller fillet diameter; θ—Angle between flat and joggle segment

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图 2 拉伸测试设备

Figure 2. Tensile testing equipment

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图 3 贴片位置

Figure 3. Strain gage location

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图 4 不同厚度下三种碳纤维/BMI树脂复合材料FJF连接接头极限载荷对比

Figure 4. Ultimate load comparison of three kinds of carbon fiber/BMI resin composite FJF joints with different adhesive thicknesses

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图 5 三种碳纤维/BMI树脂复合材料FJF连接接头典型载荷-位移曲线

Figure 5. Typical load-displacement curves of three kinds of carbon fiber/ BMI resin composite FJF joints

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图 6 三种碳纤维/BMI树脂复合材料FJF连接接头最终失效模式

Figure 6. Final failure modes of three kinds of carbon fiber/BMI resin composite FJF joints

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图 7 不同胶层厚度的碳纤维/BMI树脂复合材料FJF混合接头典型载荷-位移曲线

Figure 7. Typical load-displacement curves of carbon fiber/BMI resin composite FJF hybrid joints with different adhesive thicknesses

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图 8 三种碳纤维/BMI树脂复合材料FJF连接接头平均疲劳寿命对比

Figure 8. Average fatigue life comparison of three kinds of carbon fiber/BMI resin composite FJF joints

P_max—Maximum load; P_u—Static load; N—Load cycles

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图 9 不同胶层厚度的碳纤维/BMI树脂复合材料FJF混合接头平均疲劳寿命对比

Figure 9. Average fatigue life comparison of carbon fiber/BMI resin composite FJF hybrid joints with different adhesive thicknesses

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图 10 载荷等级为70%时碳纤维/BMI树脂复合材料FJF含胶接头背面应变值

Figure 10. Backface strain values of carbon fiber/BMI resin composite FJF joints with adhesive when load level equals 70%

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图 11 碳纤维/BMI树脂复合材料FJF混合接头三维有限元模型

Figure 11. 3D finite element model of carbon fiber/BMI resin composite FJF hybrid joint

F_p—Tensile load or pulling force

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图 12 碳纤维/BMI树脂复合材料FJF混合接头搭接区胶层剥离应力分布

Figure 12. Adhesive peel stress distribution in overlap zone of carbon fiber/BMI resin composite FJF hybrid joints

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图 13 碳纤维/BMI树脂复合材料FJF混合接头搭接区胶层剪切应力分布

Figure 13. Adhesive shear stress distribution in overlap zone of carbon fiber/BMI resin composite FJF hybrid joints

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表 1 碳纤维/BMI树脂复合材料FJF接头拉伸试验设计

Table 1. Tensile experiment design of carbon fiber/BMI resin composite FJF joints

Test type	Test number	Specimen number	Specimen quantity
Static strength	1	TS-bonded-t01	3
	2	TS-bonded-t03	3
	3	TS-bonded-t02	3
	4	TS-bolted	3
	5	TS-hybrid-t02	3
	6	TS-hybrid-t01	3
	7	TS-hybrid-t03	3
Fatigue	8	TF-bonded-t02	9
	9	TF-bolted	9
	10	TF-hybrid-t02	9
	11	TF-hybrid-t01	9
	12	TF-hybrid-t03	9
Notes: TS—Tensile static; TF—Tensile fatigue; Words in the middle refer to the joint type; Words at the right side refer to the adhesive thickness value, 01—0.1 mm, 02—0.2 mm, 03—0.3 mm.

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表 2 碳纤维/BMI树脂复合材料FJF含胶接头搭接区端部胶层开裂平均循环次数

Table 2. Average cycles of adhesive cracking at the end of overlap zone for carbon fiber/BMI resin composite FJF joints with adhesive

P_max/P_u	Average cycle
P_max/P_u	TF-bonded- t02	TF-hybrid- t01	TF-hybrid- t02	TF-hybrid- t03
90%	34	22	37	48
80%	701	404	1 074	2 222
70%	73 644	31 126	90 409	219 180

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表 3 不同胶层厚度的碳纤维/BMI树脂复合材料FJF混合接头搭接区端部和孔边胶层的应力

Table 3. Adhesive stresses at the end of overlap zone and around bolt hole of carbon fiber/BMI resin composite FJF hybrid joints with different adhesive thicknesses

Adhesive thickness/mm	Position	Peel stress/ MPa	Shear stress/ MPa
0.1	End of overlap zone	6.42	6.43
0.1	Hole edge	−18.85	±0.84
0.2	End of overlap zone	3.72	4.52
0.2	Hole edge	−17.72	±0.71
0.3	End of overlap zone	2.60	3.59
0.3	Hole edge	−17.46	±0.67

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