吉林大学学报(工学版) ›› 2019, Vol. 49 ›› Issue (4): 1063-1071.doi: 10.13229/j.cnki.jdxbgxb20180530

• • 上一篇    

高温老化对CFRP/铝合金粘接接头失效的影响

秦国锋1,2(),那景新1(),慕文龙1,谭伟1,栾建泽1,申浩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. 广西师范大学 职业技术师范学院，广西 桂林 541004
  • 收稿日期:2018-05-27 出版日期:2019-07-01 发布日期:2019-07-16
  • 通讯作者: 那景新 E-mail:qinguofengjlu@163.com;najx@jlu.edu.cn
  • 作者简介:秦国锋（1990?），男，博士研究生. 研究方向：车身结构设计理论与轻量化技术. E?mail:qinguofengjlu@163.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)

Degradation failure of adhesively bonded CFRP/aluminum alloy subjected to high temperature environment

Guo⁃feng QIN1,2(),Jing⁃xin NA1(),Wen⁃long MU1,Wei TAN1,Jian⁃ze LUAN1,Hao SHEN1   

  1. 1. State Key Laboratory of Automotive Simulation and Control，Jilin University，Changchun 130022，China
    2. Teachers College for Vocational and Technical Education, Guangxi Normal University, Guilin 541004，China
  • Received:2018-05-27 Online:2019-07-01 Published:2019-07-16
  • Contact: Jing?xin NA E-mail:qinguofengjlu@163.com;najx@jlu.edu.cn

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摘要：

为了揭示碳纤维增强复合材料（CFRP）/铝合金粘接接头在高温环境中的老化失效规律，加工了处于剪应力、拉应力和拉剪组合应力状态的粘接接头，在高温（80 ℃）环境中分别进行了10、20、30、40、50天的老化测试，分析了失效强度、失效模式的变化规律，建立了失效准则响应面。结果表明：随着拉应力比例的增加，失效强度下降更明显，下降趋势由二次多项式向线性转变，失效模式由内聚失效转变为内聚、纤维撕裂和界面失效的混合失效模式，这主要是由CFRP老化引起的；失效准则响应面平均误差为3.0%，能够对不同应力状态下的接头进行失效预测。因此，在粘接结构中降低拉应力比例能够提高承载能力，同时在失效预测时需要考虑不同应力状态的影响。

关键词: 车辆工程, 粘接接头, 高温老化, 失效规律

Abstract:

To reveal the degradation rules of adhesively bonded Carbon Fiber Reinforced Plastic (CFRP)/aluminum alloy subjected to high temperature environment, adhesive joints under shear, normal and combined shear and normal stress states were manufactured, and degraded at 80 ℃ (high temperature) for 10, 20, 30, 40, 50 days. The failure strength and failure mode were analyzed, and a response surface of failure criterion was built for the failure prediction. Results show that with increasing proportion of normal stress, the failure strength decreases more obviously and the failure mode changes from cohesive failure to mixed failure of fiber tear, interface and cohesive, which is mainly caused by the degradation of CFRP. The average relative errors of the response surface of failure criterion is about 3.0%, which can be used to predict the failure of adhesive joints under different stress states. Therefore, it is necessary to reduce the proportion of normal stress in adhesively bonded CFRP/aluminum alloy joints to improve the load capacity. Besides, the effect of fiber tear has to be taken into consideration in the failure prediction of CFRP/aluminum alloy joints.

Key words: vehicle engineering, adhesive joints, high temperature degradation, failure rule

中图分类号: 

  • U463.82

表1

CFRP材料属性"

Ex/GPaEy/GPaGxy/GPaνxy
单向125±1210±27±0.60.07
斜纹55±555±54±0.50.14

图1

粘接接头的几何尺寸"

图2

测试原理图"

图3

工装夹具"

图4

粘接接头失效强度随老化时间的变化规律"

图5

粘接接头失效强度随老化时间的拟合结果"

图6

TSJs不同老化周期后的典型失效断面"

图7

SJ45°不同老化周期后的典型失效断面"

图8

BJs不同老化周期后的典型失效断面"

图9

SEM纤维撕裂断面图"

图10

CFRP/铝合金粘接接头在不同老化周期后的失效准则"

图11

不同老化周期后的失效准则拟合精度"

图12

失效准则随着老化周期变化的响应面"

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