温湿度养护环境对CFRP-钢板界面粘结性能的影响

邓宗才; 李宏斌; 高立

温湿度养护环境对CFRP-钢板界面粘结性能的影响

邓宗才^1, ,,
李宏斌¹,
高立^{1, 2}

1.
北京工业大学　建筑工程学院, 北京 100124
2.
宿迁学院　建筑工程学院, 宿迁 223880

基金项目: 国家自然科学基金 (51578021)；江苏省高等学校自然科学研究项目 (21KJD560002)；宿迁学院校级青年基金项目 (2023XQNA03)

详细信息

通讯作者:
邓宗才，博士，教授，博士生导师，研究方向为复合材料及其结构性能　E-mail: dengzc@bjut.edu.cn

中图分类号: TB333
计量
- 文章访问数: 60
- HTML全文浏览量: 22
- 被引次数: 0
出版历程
- 收稿日期: 2024-04-07
- 修回日期: 2024-05-05
- 录用日期: 2024-05-19
- 网络出版日期: 2024-06-15

Influence of temperature and humidity curing environments on the bonding performance of CFRP-steel plate interfaces

DENG Zongcai^{1
, ,},
LI Hongbin¹,
GAO Li^{1, 2}

1.
School of Architectural Engineering, Beiing University of Technology, Beijing 100124, China
2.
Architectural Engineering Institute, College of Suqian, Suqian 223880, China

Funds: National Natural Science Foundation of China (51578021); The Natural Science Research Project of Jiangsu Province Colleges and Universities (21KJD560002); The Youth Fund Project of Suqian College (2023XQNA03)

摘要

摘要: 为了揭示温湿度共同养护作用下对CFRP粘贴钢板界面破坏模式和剥离机制的影响，本文通过CFRP-钢双剪粘结试验，综合考虑温度、湿度、粘结长度和胶层厚度多因素对CFRP-钢板界面粘结性能的影响，采用3D-DIC技术获得CFRP板表面的应变场，分析了静载拉伸过程中CFRP-钢粘结界面力学性能及破坏过程。研究结果表明：在60℃与60%相对湿度养护条件下粘结峰值荷载较高；低温和高湿环境都更易导致钢-胶界面失效；温度升高和湿度增加均会导致界面剪应力峰值降低与滑移量增加；粘结长度的增加有助于更广泛分散区域应力，而较薄(0.5 mm)的胶层有助于提高界面剪应力峰值和改善应力分布。最后，基于试验数据通过平滑法得到了简化的三折线剪切-滑移模型，为CFRP加固钢板结构的工程应用提供了理论支持和设计参考。
- CFRP-钢板 /
- 双剪试验 /
- 3D-DIC /
- 平滑法 /
- 剪切-滑移
Abstract: To investigate the impact of combined temperature and humidity curing conditions on the failure modes and delamination mechanisms of CFRP-bonded steel interfaces, this study conducted double-shear bonding tests on CFRP-steel composites, considering multiple factors such as temperature, humidity, bonding length, and adhesive layer thickness. The influence on the interfacial bonding performance of CFRP-steel interfaces was analyzed comprehensively, and the axial strain distribution of CFRP during static tensile processes was monitored using 3D-DIC technology. The findings reveal that peak bonding load is higher under curing conditions of 60℃ and 60% relative humidity, whereas low temperature and high humidity environments are more prone to cause failure at the steel-adhesive interface. Both increased temperature and humidity resulted in a reduction in interfacial shear stress peak values and an increase in slip, illustrating the impact of temperature and humidity on the ductility and adhesive properties of the interface. Additionally, it was found that an increase in bonding length helps disperse stress across a wider area, and a thinner adhesive layer contributes to higher interfacial shear stress peaks and improved stress distribution. Lastly, based on the experimental data, a simplified trilinear shear-slip model was derived using the smoothing method, providing theoretical support and design reference for the engineering application of CFRP-reinforced steel structures.
- CFRP-steel plate /
- double-lap shear test /
- 3D-DIC /
- smoothing method /
- shear-slip

HTML全文

图 1 CFRP-钢板搭接试件(单位：mm)

Figure 1. CFRP-steel plate lap joint specimen (Unit: mm)

L—Bonding length

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图 2 试件制作步骤及加载装置

Figure 2. Specimen Fabrication Steps and loading apparatus

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图 3 CFRP-钢板各种破坏模式(由左至右以此为A-100-0.5-30、B-60-0.5-30、A-80-1-30、A-100-1-30)

Figure 3. Various failure modes of CFRP-steel plate (the sequence from left to right is denoted as A-100-0.5-30, B-60-0.5-30, A-80-1-30, A-100-1-30)

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图 4 A/B组CFRP-钢板荷载-位移曲线

Figure 4. Load-displacement curves of group A/B CFRP-steel plate

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图 5 C组CFRP-钢板荷载-位移曲线

Figure 5. Load-displacement curves of group C CFRP-steel plate

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图 6 A-100-0.5-30应变云图

Figure 6. A-100-0.5-30 Strain contour map

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图 7 CFRP-钢板轴向应变分布曲线

Figure 7. Axial strain distribution curves of CFRP-steel plate

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图 8 CFRP-钢板界面剪应力分布曲线

Figure 8. Interfacial shear stress distribution curves of CFRP-steel plate

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图 9 CFRP-钢板粘结-滑移曲线

Figure 9. Bond-slip curves of CFRP-steel plate

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图 10 CFRP-钢板粘结-滑移参数对比/峰值荷载对比

Figure 10. Bond-slip parameter comparison/ Ultimate load comparison of CFRP-steel plate

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表 1 材料力学性能

Table 1. Material properties

Material	Tensile strength/ MPa	Yield strength/ MPa	Shear strength/ MPa	Tensile modulus/ MPa	Elasticity modulus/ GPa	Bending strength/ MPa	Bending modulus/ MPa	Interlayer Shear strength/GPa	Poisson’s ratio	Elongation of fracture
Steel plate	455	345	-	-	206	-	-	-	0.3	-
adhesive	31	-	23	1600	1.6	43	1800	-	-	4.2%
CFRP plate	2050	-	-	-	117	1710	117000	76.6	-	-
Notes: The adhesive parameter indicators were cured for 16 hours at 40°C and tested at 23°C.

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表 2 CFRP-钢板试件及试验结果

Table 2. CFRP-steel plate specimens and test results

Specimen number	Ultimate load /kN	Failure mode	τ_max /MPa	s₁/mm	s₂/mm	s_f /mm	G_f /(N·mm⁻¹)
A-40-0.5-30	67.29	d	30.13	0.0139	0.1093	0.2065	4.5489
A-60-0.5-30	74.35	d+c	23.93	0.0154	0.0442	0.3298	4.2893
A-80-0.5-30	69.52	d	18.38	0.0180	0.0720	0.4220	4.3752
A-100-0.5-30	76.11	d	14.02	0.0271	0.2158	0.5061	4.8704
A-40-1-30	47.04	c	19.06	0.0216	0.0537	0.1588	1.8191
A-60-1-30	72.34	d	23.87	0.0057	0.1324	0.3116	5.2311
A-80-1-30	72.44	d	18.50	0.0207	0.2262	0.4757	6.3012
A-100-1-30	81.08	d	15.86	0.0257	0.0459	0.6624	5.4115
B-40-0.5-30	59.56	c	32.65	0.0219	0.1121	0.1533	3.9750
B-60-0.5-30	84.09	d	22.07	0.0159	0.2394	0.3866	6.7324
B-80-0.5-30	86.50	b	30.64	0.0273	0.0770	0.5250	8.8029
B-100-0.5-30	85.40	a	33.98	0.0404	0.1163	0.2516	5.5646
B-40-1-30	71.93	d	26.74	0.0070	0.0300	0.2026	3.0164
B-60-1-30	73.38	d	22.37	0.0491	0.0953	0.2866	3.7215
B-80-1-30	87.98	b	23.03	0.0292	0.3653	0.4954	9.5767
B-100-1-30	57.21	b	24.95	0.1078	0.1351	0.4667	6.1613
B-40-0.5-60	57.12	d	27.92	0.0081	0.0501	0.2337	3.8495
B-60-0.5-60	84.45	a	30.47	0.0259	0.2859	0.4528	10.8612
B-80-0.5-60	65.77	b	34.35	0.0857	0.1773	0.3018	6.7566
B-100-0.5-60	80.90	a	29.64	0.0943	0.1865	0.4257	7.6737
B-40-1-60	52.96	d	27.69	0.0030	0.1004	0.1912	3.9953
B-60-1-60	64.99	c	25.12	0.0017	0.2172	0.3255	6.7948
B-80-1-60	85.35	a+b	23.23	0.0074	0.3458	0.4834	9.5441
B-100-1-60	66.94	a	25.35	0.0639	0.1783	0.3427	5.7938
B-40-0.5-90	62.78	c	37.98	0.0057	0.0710	0.2870	6.6892
B-60-0.5-90	63.00	b+d	30.63	0.0128	0.1979	0.3512	8.2143
B-80-0.5-90	88.32	a	27.33	0.0569	0.2586	0.3678	7.7814
B-100-0.5-90	81.84	b	36.33	0.0971	0.1761	0.4318	9.2786
B-40-1-90	65.98	d	28.58	0.0087	0.1280	0.2168	4.8008
B-60-1-90	79.41	d	20.66	0.0136	0.2150	0.3070	5.2518
B-80-1-90	58.88	a+b+d	29.42	0.0779	0.1786	0.2869	5.7010
B-100-1-90	81.63	a	28.37	0.0895	0.2477	0.4425	8.5191
C-40-0.5-30	68.81	a+c+d	31.16	0.0105	0.1313	0.2109	5.1678
C-60-0.5-30	77.71	a+c	34.25	0.0602	0.2017	0.3410	8.2637
C-80-0.5-30	68.80	a+d	33.73	0.1037	0.1691	0.3123	6.3685
C-100-0.5-30	78.83	a+d	26.69	0.1521	0.2635	0.4790	7.8810
C-40-1-30	63.82	a+c+d	29.84	0.0989	0.1398	0.2459	4.2798
C-60-1-30	85.15	a	31.29	0.0328	0.2751	0.4459	10.7671
C-80-1-30	71.38	a+d	22.53	0.0741	0.1995	0.3641	5.5140
C-100-1-30	67.91	d	17.92	0.0833	0.1780	0.2939	3.4820
C-40-0.5-60	69.81	a+c	24.23	0.0613	0.1075	0.1917	2.8820
C-60-0.5-60	81.95	a	27.03	0.0777	0.2885	0.3990	8.2411
C-80-0.5-60	93.97	b	26.10	0.0804	0.3073	0.4559	8.9127
C-100-0.5-60	73.67	a+b	32.20	0.0896	0.1911	0.3407	7.1183
C-40-1-60	73.90	a+c	33.70	0.0077	0.0247	0.2588	4.6481
C-60-1-60	94.26	a	32.89	0.0182	0.2193	0.4691	11.0239
C-80-1-60	88.98	a	23.23	0.0482	0.3268	0.5113	9.1776
C-100-1-60	83.96	a+b	28.01	0.1358	0.2581	0.4303	7.7389
C-40-0.5-90	50.65	d	14.61	0.0224	0.0809	0.1257	1.3463
C-60-0.5-90	44.04	d	12.26	0.0019	0.1080	0.1563	1.6087
C-80-0.5-90	41.31	d	14.82	0.0094	0.0316	0.1627	1.3706
C-100-0.5-90	70.26	a+d	10.47	0.0235	0.2705	0.3916	3.3420
C-40-1-90	58.59	c+d	23.65	0.0204	0.1056	0.1973	3.3410
C-60-1-90	52.88	d	11.96	0.0051	0.0799	0.2413	1.8898
C-80-1-90	39.81	c+d	15.00	0.0140	0.3404	0.5040	6.2288
C-100-1-90	63.81	b+d	16.74	0.0517	0.2081	0.3681	4.3897
Notes：A-40-0.5-30: Group A (-10°C), 40 mm bonding, 0.5 mm adhesive, 30% RH; τ_max—Max shear stress; s₁—Slip at max stress; s₂—Slip at plateau end; s_f—Max interface slip; G_f—Fracture energy; Group A's humidity ~30%; Failures: a—CFRP delamination, b—CFRP fracture, c—Adhesive failure, d—Steel-adhesive failure; Group A's humidity was ~30% due to curing chamber limitations.

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表 3 具有应变软化段的CFRP-钢板a、b坐标值

Table 3. Coordinate values of a and b of CFRP-steel plate with strain softening segment

Specimen number	Coordinate of point a	Coordinate of point b
A-40-1-30	(0.84297, 44.94704)	(0.92412, 43.24049)
C-60-1-60	(1.42238, 93.85569)	(1.50692, 91.73733)
C-100-0.5-30	(1.13675, 70.70329)	(1.22985, 75.8377)
C-100-1-30	(1.02044, 64.24918)	(1.19141, 64.22222)

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表 4 CFRP-钢板各类养护环境下的粘结-滑移参数平均值

Table 4. Average values of bond-slip parameters of CFRP-steel plate under various maintenance environments

Maintenance environment	$ {\overline \tau _{{\text{max}}}}{\text{/mm}} $	$ {\overline s _{\text{1}}}{\text{/mm}} $	$ {\overline s _{\text{2}}}{\text{/mm}} $	$ {\overline s _{\text{f}}}{\text{/mm}} $	$ {\overline G _{\text{f}}}{\text{/(N}} \cdot {\text{m}}{{\text{m}}^{{\text{ - 1}}}}{\text{)}} $
A-30	20.47	0.02	0.11	0.38	4.61
B-30	27.05	0.04	0.15	0.35	5.94
C-30	28.43	0.08	0.19	0.34	6.47
B-60	27.97	0.04	0.19	0.34	6.91
C-60	28.42	0.06	0.22	0.38	7.47
B-90	29.91	0.05	0.18	0.34	7.03
C-90	14.94	0.02	0.15	0.27	2.94
Notes：A-30 represents Group A's curing temperature of -10°C with a relative humidity of 30%.

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