铺层方式对CFRP⁃Al胶接接头疲劳行为的影响

Abstract

Abstract:

The finite element simulation model of Carbon Fiber Reinforced Plastics （CFRP）-aluminum single lap adhesive joint was established by Abaqus. The stacking sequences of CFRP laminate were set as ［0/90］_4s，［0/45/-45/90］_2s and ［45/-45］_4s. And the Cyclic Cohesive Zone Model （CCZM） was used to simulate the damage and evolution of the adhesive layer. The stiffness degradation， crack propagation and stress distribution of the joint were analyzed to investigate the effect of stacking sequence on the joint fatigue behavior. The experimental values of the joint fatigue life were compared with the simulated values to verify the validity of the model. The results show that from ［0/90］_4s to ［0/45/-45/90］_2s， then to ［45/-45］_4s， as the proportion of ±45° plies in CFRP laminates increases， the proportion of the joint damage accumulation stage to the total fatigue life gradually decreases and the proportion of the fatigue crack extension stage gradually increases. In addition， the joint stress mainly propagates through the fiber from the CFRP end to the aluminum end， and the stress concentration area is prone to occur at the intersection of ±45° plies， which destroys the uniformity of crack propagation rate， leading to the gradual increase in the crack growth rate difference between the middle region and the two sides of the joint with the increase of ±45° plies， and eventually the radian of the adhesive layer failure increases.

Key words: CFRP-Al, stacking sequence, stiffness degradation, crack propagation, stress distribution, finite element simulation

CLC Number:

V257

Tianchun ZOU, Yuezhang JU, Yuxi GUAN, Zegang LI, Hongcheng CHEN. Effect of stacking sequence on fatigue behavior of CFRP⁃Al joint[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(18): 428264-428264.

Figures/Tables 24

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References 36

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参数	数值
纵向弹性模量E₁/MPa	121 000
纬向弹性模量E₂/MPa	8 600
剪切模量G₁₂/MPa	3 450
泊松比μ	0.301
密度ρ/（kg·m^-3）	1 570
纵向拉伸强度X_T/MPa	2 376
纵向压缩强度X_C/MPa	123
纬向拉伸强度Y_T/MPa	69
纬向压缩强度Y_C/MPa	9.82
面内剪切强度S/MPa	145

参数	数值
弹性模量E/MPa	71 700
泊松比μ	0.32
密度ρ/（kg·m^-3）	3 000

参数	数值
弹性模量E/MPa	1 850
剪切模量G/MPa	560
拉伸强度T_I/MPa	21.6
剪切强度T_II/MPa	17.9
法向断裂能G_IC/（N·mm^-1）	0.43
剪切断裂能G_IIC/（N·mm^-1）	4.70

i	ln ln［1/R（t）］	75%载荷水平（4.45 kN）		55%载荷水平（3.26 kN）		35%载荷水平（2.08 kN）		25%载荷水平（1.48 kN）
i	ln ln［1/R（t）］	t	ln t	t	ln t	t	ln t	t	ln t
1	-1.753	474	6.161	2 442	7.801	33 364	10.415	99 998	11.513
2	-0.717	638	6.458	3 283	8.097	68 903	11.140	179 375	12.097
3	-0.050	1 026	6.933	5 235	8.563	103 672	11.549	252 329	12.620
4	0.609	1 248	7.129	7 562	8.931	135 573	11.817	457 897	13.034

i	ln ln［1/R（t）］	75%载荷水平（3.30 kN）		55%载荷水平（2.42 kN）		45%载荷水平（1.98 kN）		35%载荷水平（1.54 kN）
i	ln ln［1/R（t）］	t	ln t	t	ln t	t	ln t	t	ln t
1	-1.753	3 706	8.218	4 072	8.312	15 661	9.659	30 780	10.335
2	-0.717	4 184	8.339	9 015	9.107	37 542	10.533	81 592	11.309
3	-0.050	6 464	8.774	10 837	9.291	52 921	10.877	215 581	12.281
4	0.609	10 801	9.287	20 441	9.925	103 162	11.544	258 906	12.574

Effect of stacking sequence on fatigue behavior of CFRP⁃Al joint

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References 36

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铺层方式	载荷水平		α	β	试验		仿真		相对误差/%
铺层方式	比例/%	数值/kN	α	β	平均疲劳寿命	lg N	疲劳寿命	lg N	相对误差/%
［0/90］_4s	75	4.45	2.25	975.56	864	2.94	950	2.98	1.4
	55	3.26	1.98	5 372.48	4 763	3.68	5 924	3.78	2.5
	35	2.08	1.64	100 859.46	90 269	4.96	94 050	4.97	0.3
	25	1.48	1.53	305 218.04	275 001	5.44	380 100	5.58	2.6
［0/45/-45/90］_2s	75	3.30	1.95	7 201.55	6 387	3.81	7 750	3.89	2.2
	55	2.42	1.50	12 750.60	11 515	4.06	16 360	4.21	3.8
	45	1.98	1.27	66 327.65	61 611	4.79	85 300	4.93	2.9
	35	1.54	1.01	151 856.77	154 392	5.19	214 600	5.33	2.7
［45/-45］_4s	75	2.64	1.80	1 869.33	1 662	3.22	2 165	3.34	3.5
	65	2.29	1.41	17 804.99	16 218	4.20	19 450	4.29	1.8
	55	1.94	1.06	126 157.07	123 734	5.09	156 060	5.19	1.9
	45	1.58	0.86	312 126.17	337 158	5.53	456 740	5.66	2.4

铺层方式	初始刚度/（N·mm^-1）
［0/90］_4s	9 509.01
［0/45/-45/90］_2s	8 069.37
［45/-45］_4s	3 918.38

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i	ln ln［1/R（t）］	75%载荷水平（2.64 kN）		65%载荷水平（2.29 kN）		55%载荷水平（1.94 kN）		45%载荷水平（1.58 kN）
i	ln ln［1/R（t）］	t	ln t	t	ln t	t	ln t	t	ln t
1	-1.753	824	6.714	4 928	8.503	27 448	10.220	51 592	10.851
2	-0.717	1 015	6.923	10 119	9.222	55 589	10.926	120 667	11.701
3	-0.050	1 711	7.445	16 734	9.725	150 917	11.924	264 656	12.486
4	0.609	2 716	7.907	25 827	10.159	215 542	12.281	789 365	13.579

铺层方式	载荷水平		G_max/（J·m^-2）	da/dN
铺层方式	比例/%	数值/kN	G_max/（J·m^-2）	da/dN
［0/90］_4s	75	4.45	1 640	0.602
	55	3.26	860	0.091
	35	2.08	350	0.007
	25	1.48	177	0.001
［0/45/-45/90］_2s	75	3.30	1 027	0.153
	55	2.42	552	0.025
	45	1.98	370	0.008
	35	1.54	224	0.002
［45/-45］_4s	75	2.64	776	0.067
	65	2.29	584	0.029
	55	1.94	419	0.011
	45	1.58	278	0.003