吉林大学学报(工学版) ›› 2021, Vol. 51 ›› Issue (1): 139-146.doi: 10.13229/j.cnki.jdxbgxb20191063

• 车辆工程·机械工程 • 上一篇    

基于FTIR分析的CFRP-铝合金粘接接头剩余强度预测

慕文龙1,2(),那景新1(),谭伟1,王广彬1,申浩1,栾建泽1   

  1. 1.吉林大学 汽车仿真与控制国家重点实验室，长春 130022
    2.河南科技大学 机电工程学院，郑州 450002
  • 收稿日期:2019-09-27 出版日期:2021-01-01 发布日期:2021-01-20
  • 通讯作者: 那景新 E-mail:muwl1992@hotmail.com;najingxin@jlu.edu.cn
  • 作者简介:慕文龙（1991-），男，讲师，博士.研究方向:车身结构设计理论与轻量化技术，新材料粘接技术.E-mail: muwl1992@hotmail.com
  • 基金资助:
    国家自然科学基金项目(51775230);吉林大学研究生创新基金项目(101832018C198)

Residual strength prediction of adhesive CFRP-aluminum alloy adhesively bonded joint based on FTIR analysis

Wen-long MU1,2(),Jing-xin NA1(),Wei TAN1,Guang-bin WANG1,Hao SHEN1,Jian-ze LUAN1   

  1. 1.State Key Laboratory of Automotive Simulation and Control，Jilin University，Changchun 130022，China
    2.College of Mechnical and Electrical Engineering，Henan Agricultural University，Zhengzhou 450002，China
  • Received:2019-09-27 Online:2021-01-01 Published:2021-01-20
  • Contact: Jing-xin NA E-mail:muwl1992@hotmail.com;najingxin@jlu.edu.cn

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摘要：

对CFRP-铝合金粘接接头在湿热环境下的老化行为及机理进行了研究。将接头在80℃/95%相对湿度环境下老化不同周期，然后进行准静态拉伸、剪切测试。分析总结接头剩余强度及失效形式变化规律，并结合胶粘剂红外光谱分析，揭示老化机理。结果表明：湿热老化造成接头强度显著下降，变化规律近似服从指数函数；老化前、后接头断面均以内聚失效为主。随着老化周期的增加，胶粘剂-基材界面出现损伤并不断加剧。由于胶粘剂的增塑，老化后接头失效断面变得相对粗糙；胶粘剂在湿热环境下主要发生水解反应，出现断链现象，同时在老化初期胶粘剂发生后固化。胶粘剂退化是造成接接头强度下降的主要原因。建立了粘接接头剩余强度快速预测方法，采用该方法可以通过测试胶粘剂化学特性，实现老化后接头的剩余强度预测。

关键词: 碳纤维增强复合材料, 粘接接头, 湿热老化, FTIR分析, 剩余强度预测

Abstract:

The aging behavior and mechanism of adhesively bonded joints of CFRP- aluminum alloy exposured to hygrothermal environment were studied in this paper. First， the joints were aged at 80℃ with 95% relative humidity （RH） for different durations and then the quasi-static tensile and shear tests were performed. Second， the residual strength and failure mode of the joint were analyzed. Third， combined with the Fourier transform infrared spectroscopy （FTIR） results of adhesive， the aging mechanism of adhesive joints was revealed. The results indicate that the strength of joint decreases significantly due to hygrothermal aging， which approximates the exponential function. The failure modes of unaged and aged joints all presented cohesive failure primarily. However， with the increase in aging duration the adhesive-substrate interface was damaged， and the surfaces of aged joints became relatively rough due to the plasticizing of the adhesive. The hydrolysis reaction occurred in the adhesive due to hygrothermal aging， resulting in chain scission. The post curing of adhesive was also observed at the initial stage of aging. Adhesive degradation is the primary cause of the decrease in the strength of the joint. Finally a residual strength prediction method was established， which can be used to predict residual strength of hygrothermally aged joints by testing the chemical characteristics of adhesive.

Key words: carbon fiber reinforced polymer composites（CFRP）, adhesively bonded joint, hygrothermal aging, fourier transform infrared spectroscopy analysis, residual strength prediction

中图分类号: 

  • U463.82

表1

CFRP材料属性参数"

Ex/GPaEy/GPaVxyGxy/GPaGxz/GPaGyz/GPa
单向125±1210±20.077±0.62±0.52±0.3
斜纹55±555±50.134±0.52±0.32±0.3

图1

CFRP-铝合金粘接接头尺寸示意图"

图2

粘接夹具"

图3

粘接接头准静态测试"

图4

粘接接头失效剩余强度随老化时间变化规律"

图5

湿热老化前、后对接接头失效断面"

图6

湿热老化前、后剪切接头失效断面"

图7

接头断面典型区域SEM图-放大100倍"

图8

湿热老化不同周期的胶粘剂FTIR光谱图"

表2

Araldite? 2015典型官能团类别及对应波数"

波数/cm-1官能团
3325-OH、-NH伸缩振动
2923、2850烷基 (-CH3、-CH2) 伸缩振动
1736酯基 (-(C=O)-O)
1648羰基 (C=O)
1508p-二取代苯环的半圆伸缩振动
1452脂族基的C–H弯曲振动
1053醚类C-O-C反式伸缩振动
914p-亚苯基

图9

官能团吸光度随老化时间的变化"

图10

官能团吸光度与对接、剪切接头剩余强度的相关系数"

表3

剩余强度预测精度 (%)"

波数/cm-1接头类型
对接剪切
332594.0394.19
173699.7199.70
164895.8996.03
91498.5998.67

图11

剩余强度预测相对误差"

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[1] 秦国锋,那景新,慕文龙,谭伟,栾建泽,申浩. 高温老化对CFRP/铝合金粘接接头失效的影响[J]. 吉林大学学报(工学版), 2019, 49(4): 1063-1071.
[2] 那景新,慕文龙,范以撒,谭伟,杨佳宙. 车身钢-铝粘接接头湿热老化性能[J]. 吉林大学学报(工学版), 2018, 48(6): 1653-1660.
[3] 胡志清, 郑会会, 徐亚男, 张春玲, 党停停. 表面微沟槽对Al/CFRP胶结性能的影响[J]. 吉林大学学报(工学版), 2018, 48(1): 229-235.
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