CFRP平-折-平连接接头试验研究与数值模拟

许昶; 刘志明

doi:10.13700/j.bh.1001-5965.2019.0062

CFRP平-折-平连接接头试验研究与数值模拟

doi: 10.13700/j.bh.1001-5965.2019.0062

许昶,
刘志明^,

北京交通大学机械与电子控制工程学院, 北京 100044

基金项目:

国家重点研发计划 2016YFB1200505-011

详细信息

作者简介:
许昶男, 博士研究生。主要研究方向:复合材料结构设计

刘志明男, 博士, 教授, 博士生导师。主要研究方向:结构疲劳及其可靠性

通讯作者:
刘志明.E-mail:zhmliu1@bjtu.edu.cn

中图分类号: TB331
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- 被引次数: 0
出版历程
- 收稿日期: 2019-02-22
- 录用日期: 2019-04-19
- 网络出版日期: 2019-11-20

Experimental study and numerical simulation on CFRP flat-joggle-flat joints

XU Chang,
LIU Zhiming^,

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

Funds:

National Key R & D Program of China 2016YFB1200505-011

More Information

Corresponding author: LIU Zhiming.E-mail:zhmliu1@bjtu.edu.cn

摘要

摘要:
针对碳纤维增强复合材料（CFRP）平-折-平（FJF）连接接头强度和失效问题进行了试验研究和数值模拟。基于商用有限元软件ABAQUS，建立了FJF连接接头强度预测模型，通过与试验结果进行对比，探究了此类接头在拉伸载荷工况下的失效形式和承载能力，同时分析了搭接长度对接头强度和失效模式的影响。结果表明，利用模型预测的接头承载能力与试验结果的误差均小于3.5%，具有较好的精度。不同搭接长度下，FJF混合连接接头相较于胶接连接接头和机械连接接头强度均有提升。接头的强度随着搭接长度的增大而增大，搭接长度增大到一定程度后趋于平缓。搭接长度较小时，FJF混合连接接头失效表现为胶层沿搭接区的断裂和孔边挤压失效；搭接长度较大时，失效模式转变为层合板孔边拉伸断裂和胶层扩展至孔边的断裂。
- 碳纤维增强复合材料(CFRP) /
- 平-折-平(FJF)连接接头 /
- 有限元分析 /
- 失效 /
- 搭接长度
Abstract:
Both experimental tests and numerical simulation were implemented to investigate the strength and failure problem of carbon fiber reinforced plastics (CFRP) flat-joggle-flat (FJF) joints. Based on the commercial finite element analysis software ABAQUS, strength prediction models of the FJF joints were built. Compared with the test results, the failure modes and the carrying capacity of the joints were studied under the tensile load condition. Meanwhile, the effect of the lap length on the joint strength and failure modes was analyzed. The results show that the carrying capacity for each joint predicted by the model has the error value under 3.5%, which illustrates good accuracy with the test results. For different lap lengths, the strength of the FJF hybrid joint is higher than that of the bonded and bolted joint. The strength of each joint increases with the lap length, but tends to flatten when the lap length increases to a certain level. As the lap length is small, the failure of the FJF hybrid joint is manifested by the fracture of the adhesive layer along the lap zone and the bearing failure. For larger lap length, the failure modes are changed into the tensile fracture of the laminated plate near the hole and the fracture of the adhesive layer extending to the hole edge.
- carbon fiber reinforced plastics (CFRP) /
- flat-joggle-flat (FJF) joint /
- finite element analysis /
- failure /
- lap length

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图 1 胶层材料拉伸应力-应变关系

Figure 1. Tensile stress-strain relationship of adhesive material

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图 2 FJF胶接连接接头示意图

Figure 2. Schematic diagram of FJF bonded joint

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图 3 FJF机械连接接头示意图

Figure 3. Schematic diagram of FJF bolted joint

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图 4 FJF混合连接接头示意图

Figure 4. Schematic diagram of FJF hybrid joint

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图 5 拉伸测试设备

Figure 5. Tensile testing equipment

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图 6 胶层失效分析VUMAT流程图

Figure 6. VUMAT flowchart for failure analysis of the adhesive layer

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图 7 带孔层合板渐进损伤分析VUMAT流程图

Figure 7. VUMAT flowchart for progressive damage analysis of the composite laminate with holes

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图 8 3种FJF连接接头拉伸载荷-位移曲线

Figure 8. Tensile load-displacement curves of three kinds of FJF joints

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图 9 3种FJF连接接头极限载荷对比

Figure 9. Ultimate load comparison of three kinds of FJF joints

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图 10 3种FJF连接接头载荷-位移曲线

Figure 10. Load-displacement curves of three kinds of FJF joints

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图 11 FJF胶接连接接头胶层即将失效时等效塑性应变

Figure 11. Equivalent plastic strain of FJF bonded joint when adhesive layer is about to fail

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图 12 FJF机械连接接头失效图

Figure 12. Failure of FJF bolted joint

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图 13 FJF混合连接接头失效图

Figure 13. Failure of FJF hybrid joint

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图 14 FJF混合连接接头载荷第一次下降时搭接区端部胶层开裂

Figure 14. Adhesive layer fracture at the end of overlap zone when load of FJF hybrid joint falls for the first time

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表 1 测试试样几何尺寸

Table 1. Geometry of testing specimen

参数	数值
孔径/mm	3.98
未圆角长度/mm	45
宽度/mm	16
端距/mm	12
层合板厚度/mm	2
胶层厚度/mm	0.2
较大圆角半径/mm	30
较小圆角半径/mm	25.8
平折段夹角/(°)	7.83

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表 2 刚度退化准则

Table 2. Stiffness degradation rules

失效模式	刚度退化准则
纤维拉伸模式(σ₁≥0)	E′₁=0.07E₁, E′₂=0.07E₂, E′₃=0.07E₃, ν′₁₂=0.14ν₁₂, ν′₁₃=0.14ν₁₃, ν′₂₃=0.14ν₂₃
纤维压缩模式(σ₁ < 0)	E′₁=0.14E₁, E′₂=0.14E₂, E′₃=0.14E₃, ν′₁₂=0.14ν₁₂, ν′₁₃=0.14ν₁₃, ν′₂₃=0.14ν₂₃
基体拉伸模式(σ₂≥0)	E′₂=0.2E₂, G′₁₂=0.2G₁₂, G′₂₃=0.2G₂₃
基体压缩模式(σ₂ < 0)	E′₂=0.4E₂, G′₁₂=0.4G₁₂, G′₂₃=0.4G₂₃
纤-基剪切模式(σ₁ < 0)	G′₁₂=0, ν′₁₂=0
拉伸分层模式(σ₃≥0)	E′₃=0, G′₁₃=0, G′₂₃=0，ν′₁₃=0, ν′₂₃=0
压缩分层模式(σ₃ < 0)	E′₃=0, G′₁₃=0, G′₂₃=0，ν′₁₃=0, ν′₂₃=0

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表 3 不同水平搭接段长度下FJF连接接头强度对比

Table 3. Strength comparison of FJF joints under different horizontal lap lengths

水平搭接段长度/ mm	胶接连接接头强度/kN	机械连接接头强度/kN	混合连接接头强度/kN	混合连接接头相较于胶接连接接头/%	混合连接接头相较于机械连接接头/%
25	9.24	9.38	11.93	+29.1	+27.2
35	9.61	10.03	13.64	+41.9	+36.0
45	9.84	10.40	13.77	+39.9	+32.4

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