单双搭接接头经高温老化后的失效对比

doi:10.13229/j.cnki.jdxbgxb20210087

Abstract

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

CLC Number:

U463.82

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.

Figures/Tables 12

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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

Failure comparison of single and double lap joints after high temperature aging

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