粘结层厚度不均匀对CFRP-钢界面粘结性能的影响

李晓虎; 李晓章; 李田

粘结层厚度不均匀对CFRP-钢界面粘结性能的影响

昆明理工大学　建筑工程学院, 昆明 650500

基金项目: 国家自然科学基金 (52308537)；云南省基础研究计划面上项目(202301AT070394)

详细信息

通讯作者:
李晓章，博士，讲师，硕士生导师，研究方向为桥梁结构加固　E-mail: 20150087@kust.edu.cn

中图分类号: TB332
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- 文章访问数: 32
- HTML全文浏览量: 18
- 被引次数: 0
出版历程
- 收稿日期: 2024-07-09
- 修回日期: 2024-08-26
- 录用日期: 2024-09-08
- 网络出版日期: 2024-09-25

Influence of uneven thickness of bonding layer on the bonding performance of CFRP-steel interface

Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China

Funds: National Natural Science Foundation of China (52308537); Yunnan Provincial Basic Research Program General Project (202301AT070394)

摘要

摘要: CFRP-钢界面的粘结性能决定CFRP材料的加固效果，其中粘结层厚度不均匀是影响粘结性能的重要因素。为揭示粘结层厚度不均匀情况下CFRP加固钢板的力学破坏机制，先开展16个粘结层厚度均匀的双剪试验，由试验结果得出粘结层厚度为0.5mm时的承载力最优。再围绕0.5mm开展粘结层厚度沿纵向和横向不均匀的18个双剪试验，研究粘结层厚度不均匀情况下的力学性能和破坏机理。结果表明粘结层厚度不均匀对承载力影响较大，随着粘结层厚度不均匀程度的增加，承载力呈递减趋势，纵向不均匀的承载力降低6.45%~36.55%，横向不均匀的承载力降低9.57%~47.38%。不均匀程度相同时，横向不均匀的承载力平均比纵向不均匀的承载力低9.8kN, 横向不均匀的承载力降低幅度平均比纵向不均匀大6.65%，横向不均匀的不利影响大于纵向不均匀。粘结层厚度纵向、横向不均匀的应变及剪应力变化规律与厚度均匀的试件相比存在较大差异。结合试验得到的粘结滑移关系建立粘聚力数值模型，通过分析数值模拟结果和试验结果，表明粘聚力模型可以很好的模拟粘结层厚度不均匀对粘结界面的非线性力学行为。
- 厚度 /
- 均匀性偏差 /
- 剪切试验 /
- 数值模拟 /
- 粘结性能
Abstract: The bond performance at the CFRP-steel interface determines the reinforcement effectiveness of CFRP materials, with the uneven thickness of the adhesive layer being a critical factor affecting the bonding performance. To reveal the mechanical failure mechanism of CFRP-reinforced steel plates under conditions of uneven adhesive layer thickness, 16 double-shear tests with uniform adhesive layer thicknesses were conducted first. The test results showed that a thickness of 0.5 mm yielded the optimal bearing capacity. Then, 18 additional double-shear tests were performed with the adhesive layer thickness varied both longitudinally and transversely around 0.5 mm to study the mechanical performance and failure mechanisms under uneven adhesive layer thicknesses. The results indicated that the uneven thickness of the adhesive layer significantly impacts the bearing capacity. As the degree of unevenness increased, the bearing capacity showed a decreasing trend. Longitudinal unevenness reduced the bearing capacity by 6.45% to 36.55%, while transverse unevenness reduced it by 9.57% to 47.38%. When the degree of unevenness was the same, the bearing capacity for transverse unevenness was, on average, 9.8 kN lower than that of longitudinal unevenness. The reduction in bearing capacity for transverse unevenness was, on average, 6.65% greater than for longitudinal unevenness, indicating that transverse unevenness has a more detrimental effect than longitudinal unevenness. The strain and shear stress variation patterns of specimens with longitudinal and transverse unevenness also showed significant differences compared to those with uniform thickness. A cohesive numerical model was established based on the bond-slip relationship obtained from the experiments. By analyzing the results of the numerical simulation and the experimental data, it was shown that the cohesive model can effectively simulate the nonlinear mechanical behavior of the bond interface under uneven adhesive layer thickness conditions.
- thickness /
- uniformity deviation /
- shear test /
- numerical simulation /
- adhesive property

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图 1 单块钢板试件(单位：mm)

Figure 1. Single steel plate specimen (Unit: mm)

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图 2 CFRP-钢试件样品图

Figure 2. CFRP-steel specimen sample diagram

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图 3 CFRP-钢双剪试件粘贴示意图(单位：mm)

Figure 3. Schematic diagram of CFRP-steel double-cut specimen pasting (Unit: mm)

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图 4 测试加载装置及采集系统

Figure 4. Test loading device and acquisition system

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图 5 粘结层厚度变化及应变片布置方式(单位：mm)

Figure 5. Variation of adhesive layer thickness and the arrangement of strain gauges (Unit: mm)

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图 6 CFRP-钢双剪试件破坏模式

Figure 6. CFRP-steel double-shear specimen failure mode

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图 7 CFRP-钢试件极限承载力与粘结层厚度关系

Figure 7. CFRP-Relationship between ultimate bearing capacity and bond layer thickness of steel specimens

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图 8 不同粘结层厚度下CFRP-钢试件的荷载-位移曲线

Figure 8. Load-displacement curves of CFRP- steel specimens with different bond thicknesses

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图 9 CFRP-钢双剪试件应变分布

Figure 9. Strain distribution of CFRP-steel double-shear specimens

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图 10 CFRP-钢双剪试件界面剪应力分布

Figure 10. Interfacial shear stress distribution of CFRP-steel double-shear specimens

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图 11 CFRP-钢-双剪试件的粘结-滑移曲线

Figure 11. Bond-slip curves of CFRP-steel-double-shear specimens

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图 12 CFRP-钢双剪试件的有限元模型

Figure 12. Finite element model of CFRP-steel double-shear specimens

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图 13 粘结层刚度退化过程

Figure 13. Degradation process of the stiffness of the bonding layer

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图 14 粘结层应力图

Figure 14. Stress diagram of bonding layer

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图 15 数值模拟与试验应变对比

Figure 15. Comparison of numerical simulation and experimental strain

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表 1 CFRP板、钢板及粘结剂材料参数

Table 1. Material parameters of CFRP plate, steel plate and adhesives

Material parameter	CFP-Ⅰ-14	CFRP-A/B	Q345 qC
Elasticity modulus/GPa	165	5.3	206
Tensile strength/MPa	2400	38	514
Shear strength/MPa	55	—	79000
Shear strength for steel-to-steel joint/MPa	—	41.6	—
Poisson’s ratio	0.28	0.35	0.30
Elongation at break/%	1.6	1.13	21%

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表 2 CFRP-钢双剪试件拉伸试验结果

Table 2. Tensile test results of CFRP-steel double-shear specimens

Grouping	Specimen number	DV	Ultimate load/kN					Limit displacement/mm				Failure mode
Grouping	Specimen number	DV	P_max	Average	ABAQUS	Relative error	D_max		Average	ABAQUS	Relative error	Failure mode
A	JY-0.1-1	0	36.59	33.42	35. 26	5.5%	3.06		2.95	2.89	2.1%	a
	JY-0.1-2		30.25	33.42	35. 26	5.5%	2.84		2.95	2.89	2.1%	a
	JY-0.2-1		54.01	49.67	50.19	1.0%	4.27		4.1	4.13	0.7%	a+b
	JY-0.2-2		45.33	49.67	50.19	1.0%	3.92		4.1	4.13	0.7%	a
	JY-0.3-1		60.50	59.7	62.34	4.4%	6.30		6.26	6.15	1.8%	a+b
	JY-0.3-2		58.90	59.7	62.34	4.4%	6.21		6.26	6.15	1.8%	a
	JY-0.4-1		78.26	74.48	74.25	0.3%	8.16		7.9	7.76	1.80%	a+b
	JY-0.4-2		70.70	74.48	74.25	0.3%	7.64		7.9	7.76	1.80%	a+b
	JY-0.5-1		99.05	98.7	101.24	2.6%	8.57		8.67	8.71	0.5%	a+b+c
	JY-0.5-2		98.35	98.7	101.24	2.6%	8.76		8.67	8.71	0.5%	a+b+c
	JY-0.6-1		84.59	82.43	82.75	0.4%	7.28		7.16	7.21	0.7%	a+b+c
	JY-0.6-2		80.27	82.43	82.75	0.4%	7.03		7.16	7.21	0.7%	a+b
	JY-0.8-1		77.80	75.78	74.15	2.2%	6.88		6.71	6.68	0.5%	a+b+c
	JY-0.8-2		73.76	75.78	74.15	2.2%	6.53		6.71	6.68	0.5%	a+b+c
	JY-1.0-1		57.32	54.46	56.30	3.4%	6.11		5.84	5.72	2.1%	a+b+c
	JY-1.0-2		51.60	54.46	56.30	3.4%	5.56		5.84	5.72	2.1%	a+b+c
B	ZX-0.4-0.6-1	0.1	91.3	92.33	96.50	4.5%	7.94		8.05	8.12	0.9%	a+b+d
	ZX-0.4-0.6-2	0.1	95.35	92.33	96.50	4.5%	8.16		8.05	8.12	0.9%	a+b+c
	ZX-0.3-0.7-1	0.2	80.16	81.95	84.37	3.0%	6.50		6.54	6.46	1.2%	a+b
	ZX-0.3-0.7-2	0.2	83.73	81.95	84.37	3.0%	6.58		6.54	6.46	1.2%	a+b+c
	ZX-0.2-0.8-1	0.3	74.64	76.5	78.8	3.0%	5.93		5.86	5.80	1.0%	a+b+c
	ZX-0.2-0.8-2	0.3	78.36	76.5	78.8	3.0%	5.79		5.86	5.80	1.0%	a+b
	ZX-0.1-0.9-1	0.4	62.14	62.63	62.22	0.7%	5.28		5.26	5.18	1.5%	a+b+c
	ZX-0.1-0.9-2	0.4	63.11	62.63	62.22	0.7%	5.23		5.26	5.18	1.5%	b+c
C	HX-0.5-1	0	95.6	94.25	101.24	7.4%	8.01		8.14	8.71	7.0%	a+b+c
	HX-0.5-2	0	92.89	94.25	101.24	7.4%	8.26		8.14	8.71	7.0%	a+b+c
	HX-0.4-0.6-1	0.1	86.95	85.23	87.86	3.1%	6.83		6.53	6.62	1.4%	a+b+c
	HX-0.4-0.6-2	0.1	83.5	85.23	87.86	3.1%	6.22		6.53	6.62	1.4%	a+b+c
	HX-0.3-0.7-1	0.2	75.56	77.92	78.26	0.4%	6.01		6.27	6.36	1.4%	a+b+c+d
	HX-0.3-0.7-2	0.2	80.27	77.92	78.26	0.4%	6.52		6.27	6.36	1.4%	a+b+c
	HX-0.2-0.8-1	0.3	62.43	61.46	62.87	2.3%	4.93		4.85	4.91	1.2%	a+b+c+d
	HX-0.2-0.8-2	0.3	60.49	61.46	62.87	2.3%	4.76		4.85	4.91	1.2%	a+b+c+d
	HX-0.1-0.9-1	0.4	46.88	49.59	50.23	1.3%	4.39		4.64	4.71	1.5%	a+b+c+d
	HX-0.1-0.9-2	0.4	52.3	49.59	50.23	1.3%	4.89		4.64	4.71	1.5%	a+b+c
Notes: D_max−Limit displacement; P_max−Ultimate load; ABAQUS−Numerical analysis results; DV−Maximum deviation between the thickness of the bond layer and the average thickness; Failure mode: a−CFRP and adhesive debonding failure; b−Steel and adhesive debonding failures; c−Adhesive shatter; d−CFRP tearing; JY-0.1-1−Thickness of the adhesive layer is uniform, and the thickness of the adhesive layer is 0.1 mm; ZX-0.4-0.6-1−Thickness of the adhesive layer is not uniform in the longitudinal direction, and the thickness of the adhesive layer increases from 0.4 mm to 0.6 mm for the first specimen; HX-0.4-0.6-1−Thickness of the adhesive layer is not uniform transversely, and the thickness of the adhesive layer increases from 0.4 mm to 0.6 mm for the first specimen.

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表 3 CFRP-钢界面粘结-滑移本构参数

Table 3. Bond-slip constitutive parameters of CFRP-steel interface

Parameter	τ_f/MPa	K/MPa·mm⁻¹	δ_f/mm	G_f/MPa·mm
JY-0.1	5.45	21.80	0.25	0.68
JY-0.2	11.25	43.27	0.26	1.46
JY-0.3	9.59	39.96	0.24	1.15
JY-0.4	15.51	43.08	0.36	2.79
JY-0.5	22.15	33.56	0.66	7.31
JY-0.6	18.48	42.98	0.43	3.97
JY-0.8	15.04	47.00	0.32	2.41
JY-1.0	11.58	29.69	0.39	2.26
ZX-0.4-0.6	18.74	26.39	0.71	6.65
ZX-0.3-0.7	12.73	22.73	0.56	3.56
ZX-0.2-0.8	13.77	28.69	0.48	3.30
ZX-0.1-0.9	15.28	36.38	0.42	3.21
HX-0.5	15.03	19.52	0.77	5.79
HX-0.4-0.6	13.7	18.51	0.74	5.07
HX-0.3-0.7	13.06	19.21	0.68	4.44
HX-0.2-0.8	11.78	19.00	0.62	3.65
HX-0.1-0.9	8.86	18.46	0.48	2.13
Notes: τ_f−Maximum shear stress; K−Interfacial stiffness; δ_f−Limit slip of failure; G_f−Interfacial fracture energy.

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