单双搭接接头经高温老化后的失效对比

doi:10.13229/j.cnki.jdxbgxb20210087

摘要/Abstract

摘要：

为了对比研究单双搭接接头在高温老化后的失效情况，加工制作了一批Al-CFRP单搭接接头和Al-CFRP-Al双搭接接头。选取80°C高温老化周期0、10、20、30d，并在－40、20、80°C环境下进行准静态拉伸试验，建立一元回归与二元回归模型，分析总结搭接接头失效强度与失效形式变化规律，揭示老化机理。结果表明：老化时间的增加和服役温度的升高都会造成接头失效强度显著下降，服役温度比老化时间对失效强度的影响更大、相关性更高；双搭接接头失效强度明显高于单搭接接头，在工程应用中，在一定条件下可以用双搭接连接来代替单搭接连接以获取更大的承载能力。随着老化时间的增加，搭接接头失效形式从内聚失效变为混合失效并伴随纤维撕裂的出现，老化时间越长，纤维撕裂越明显，通过SEM电镜观察到老化后的CFRP树脂明显减少，CFRP基体与树脂间结合力降低，导致其更容易发生纤维撕裂现象。

关键词: 车辆工程, 高温老化, 服役温度, 回归分析

Abstract:

In order to study the failure of single and double lap joints after high temperature aging， a batch of Al-CFRP single lap joints and Al-CFRP-Al double lap joints were fabricated. The quasi-static tensile tests were carried out at －40， 20 and 80°C after aging at 80°C for 0， 10， 20 and 30 days. The single regression and binary regression models were established to analyze summarize the failure strength and failure forms of lap joints and reveal the aging mechanism. The results show that： with the increase of aging time and service temperature， the failure strength of the joint decreases significantly， and the service temperature has a greater influence on the failure strength than the aging time， and the correlation is higher. The failure strength of double lap joint is significantly higher than that of single lap joint. In engineering application， double lap joint can be used to replace single lap joint to obtain greater bearing capacity under certain conditions. With the increase of aging time， the failure mode of lap joint changes from cohesive failure to mixed failure， accompanied by fiber tearing. The longer the aging time is， the more obvious the fiber tearing is. The SEM observation shows that the aging CFRP resin decreases significantly， and the bonding strength between CFRP matrix and resin decreases， which leads to the fiber tearing phenomenon more easily.

Key words: vehicle engineering, high temperature aging, service temperature, regression analysis

中图分类号:

U463.82

王登峰,陈宏利,那景新,陈鑫. 单双搭接接头经高温老化后的失效对比[J]. 吉林大学学报(工学版), 2023, 53(2): 346-354.

Deng-feng WANG,Hong-li CHEN,Jing-xin NA,Xin CHEN. Failure comparison of single and double lap joints after high temperature aging[J]. Journal of Jilin University(Engineering and Technology Edition), 2023, 53(2): 346-354.

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服役温度/°C	二次多项式函数		指数函数
服役温度/°C	单搭接	双搭接	单搭接	双搭接
-40°C	0.9825	0.9966	0.9910	0.9896
20°C	0.9781	0.9877	0.9749	0.9845
80°C	0.9979	0.9986	0.9721	0.9747

项目名称	T值		P值
项目名称	单	双	单	双
常量	129.297	160.11	<0.001	<0.001
D	-6.561	-4.962	0.001	0.003
T	-9.895	-9.298	<0.001	<0.001
DT	0.86	-1.221	0.423	0.268
D²	1.383	-0.510	0.216	0.628
T²	-0.17	-0.371	0.87	0.723
单	R²=0.991	R²_adj=0.984	F=139.696	P<0.001
双	R²=0.993	R²_adj=0.987	F=165.879	P<0.001

项目名称	平均失效强度
项目名称	单	双
D	-0.683	-0.681
T	-0.722	-0.726
DT	-0.705	-0.751
D²	-0.640	-0.658
T²	-0.550	-0.557

试验条件	试验值/MPa		理论值/MPa		相对误差/%
试验条件	单	双	单	双	单	双
15天-40℃	14.31	23.04	13.96	22.16	2.45	3.82
15天20℃	11.76	21.60	12.87	20.68	9.44	4.26
15天80℃	11.26	18.21	11.74	19.10	4.26	4.89

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