CFRP@GFRP混杂复合材料杆体在水浸泡环境下的性能演化

李承高; 郭瑞; 王俊琦; 黄涵鑫; 咸贵军

doi:10.13801/j.cnki.fhclxb.20201215.008

CFRP@GFRP混杂复合材料杆体在水浸泡环境下的性能演化

doi: 10.13801/j.cnki.fhclxb.20201215.008

李承高^{1, 2,},
郭瑞^{1, 2,},
王俊琦^{1, 2,},
黄涵鑫^{1, 2,},
咸贵军^{1, 2, ,}

1.
哈尔滨工业大学　结构工程灾变与控制教育部重点实验室，哈尔滨 150090
2.
哈尔滨工业大学　土木工程学院，哈尔滨 150090

基金项目: 国家自然科学基金(52008137)；中国博士后科学基金(2019TQ0079；2019M661288)；黑龙江省博士后面上基金(LBH-Z19161)

详细信息

通讯作者:
咸贵军，博士，教授，博士生导师，研究方向为土木工程纤维增强树脂复合材料与结构　E-mail：gjxian@hit..edu.cn

中图分类号: TB332；U444
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出版历程
- 收稿日期: 2020-10-22
- 录用日期: 2020-12-05
- 网络出版日期: 2020-12-15
- 刊出日期: 2021-10-01

Property evolution of CFRP@GFRP hybrid composite rod exposed in the distilled water

LI Chenggao^{1, 2
,},
GUO Rui^{1, 2
,},
WANG Junqi^{1, 2
,},
HUANG Hanxin^{1, 2
,},
XIAN Guijun^{1, 2
, ,}

1.
Key Lab of Structures Dynamic Behavior and Control, Harbin Institute of Technology, Ministry of Education, Harbin, 150090, China
2.
School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China

摘要

摘要: 碳纤维增强树脂复合材料(CFRP)@玻璃纤维增强树脂复合材料(GFRP)混杂复合材料杆体发挥碳纤维的高力学、疲劳性能与玻璃纤维的低成本、高变形能力等优势，在桥梁与海洋工程中具有巨大应用潜力，如跨海大桥斜拉索。针对CFRP@GFRP混杂复合材料杆体在服役环境下长期性能演化，本文采用加速试验方法研究蒸馏水环境下CFRP@GFRP混杂复合材料杆体的水吸收及界面剪切性能长期演化规律。研究结果表明：混杂复合材料杆体皮、芯层及杆体吸水行为符合Fick定律，GFRP皮层扩散系数最大，CFRP芯层次之，混杂复合材料杆体由于在皮/芯界面层形成吸水屏障而扩散系数最小。浸泡在蒸馏水环境下芯层、皮/芯界面及皮层界面剪切强度下降，这是由于浸泡过程中水分子通过氢键形式与树脂基体结合形成结合水，导致树脂基体发生水解和塑化及纤维/树脂界面脱黏。基于Arrhenius加速理论建立了混杂复合材料杆体在三座典型桥梁服役环境下的界面剪切强度预测模型。
- CFRP@GFRP混杂复合材料杆体 /
- 湿热老化 /
- 吸水性能 /
- 界面剪切强度 /
- 长期寿命预测
Abstract: Carbon fiber reinforced polymer (CFRP)@glass fiber reinforced polymer (GFRP) hybrid composite rod plays the advantages of carbon fiber (such as high mechanical and fatigue performances) and glass fiber (such as low cost and high deformation capacity) and has great application potential in bridge and ocean engineering, such as cross-sea bridge cable. In view of the long-term performance evolution of CFRP@GFRP hybrid composite rod under the service environment, the present paper adopted the experimental acceleration method to study the water absorption and interface shear performance evolution of CFRP@GFRP hybrid composite rod under the distilled water environment. The results show that the absorption behavior of hybrid composite rod is in accordance with Fick law. The diffusion coefficient of glass fiber shell is the largest, carbon fiber core is the second, and the hybrid composite rod is the smallest due to the water absorption barrier between the shell/core interface layer. Immersed in distilled water leads to the decrease of the interface shear strength of core, shell/core and shell layers. This is attributed to the water molecules combined with the resin matrix in the form of hydrogen bond to form the bond water, resulting in the hydrolysis and plasticization of the resin matrix and the debonding of the fiber/resin interface. The prediction model of interface shear strength of hybrid composite rod was established in three typical bridge service environments based on the accelerating theory of Arrhenius.
- CFRP@GFRP hybrid composite rod /
- hydrothermally aging /
- water absorption /
- interface shear strength /
- long-term life prediction

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图 1 拉挤碳纤维增强树脂复合材料(CFRP)@玻璃纤维增强树脂复合材料(GFRP)混杂复合材料杆体

Figure 1. Pultruded carbon fiber reinforced polymer (CFRP)@glass fiber reinforced polymer (GFRP) hybrid composite rod

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图 2 CFRP 芯层、GFRP 皮层及CFRP@GFRP混杂复合材料杆体的水吸收测试试样

Figure 2. Water absorption samples of CFRP core, GFRP shell and CFRP@GFRP hybrid composite rod

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图 3 界面剪切强度测试装置

Figure 3. Interface shear strength testing device

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图 4 CFRP芯层、GFRP皮层及CFRP@GFRP混杂复合材料杆体的吸水曲线

Figure 4. Water uptake curves versus the square root of time for CFRP core, GFRP shell and CFRP@GFRP hybrid composite rod

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图 5 CFRP芯层、GFRP皮层及CFRP@GFRP混杂复合材料杆体扩散系数与浸泡温度之间的关系

Figure 5. Diffusivity coefficient vs. immersed temperature of CFRP core, GFRP shell and CFRP@GFRP hybrid composite rod

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图 6 CFRP@GFRP混杂复合材料杆体的水吸收扩散机制^[18]

Figure 6. Water absorption and diffusion mechanism of CFRP@GFRP hybrid composite rod^[18]

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图 7 CFRP@GFRP混杂复合材料杆体不同层结构界面剪切强度

Figure 7. Interface shear strength of CFRP@GFRP hybrid composite rod immersed for different layers

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图 8 不同浸泡温度下CFRP@GFRP混杂复合材料杆体CFRP芯层和GFRP皮层的玻璃化转变温度 T_g

Figure 8. Glass transition temperatures T_g of CFRP core and GFRP shell for CFRP@GFRP hybrid composite rod immersed at different temperatures

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图 9 浸泡前(原始试样)和浸泡后(60℃/90天)CFRP@GFRP混杂复合材料杆体CFRP芯层和GFRP皮层的表面形貌

Figure 9. Surface morphologies of CFRP core and GFRP shell for CFRP@GFRP hybrid composite rod before (control sample) and after the immersions (60°C/90 days)

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图 10 CFRP@GFRP混杂复合材料杆体界面剪切强度长期寿命预测的拟合曲线

Figure 10. Fitted curves of long-term life prediction for interface shear strength of CFRP@GFRP hybrid composite rod

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图 11 CFRP@GFRP混杂复合材料杆体界面剪切强度长期寿命的Arrhenius拟合曲线

Figure 11. Arrhenius fitted curves of long-term life for interface shear strength of CFRP@GFRP hybrid composite rod

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图 12 CFRP@GFRP混杂复合材料杆体在三种桥梁服役环境下界面剪切强度的长期寿命预测

Figure 12. Long-term life predictions of interface shear strength of CFRP@GFRP hybrid composite rod exposed to three bridge service environments

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表 1 CFRP芯层、GFRP皮层及CFRP@GFRP混杂复合材料杆体的扩散系数D

Table 1. Diffusion coefficients D of CFRP core, GFRP shell and CFRP@GFRP hybrid composite rod 10⁻⁷mm²/s

Type	20℃	40℃	60℃
CFRP core	2.68	3.77	7.67
GFRP shell	3.08	6.03	9.14
CFRP@GFRP	1.26	2.30	8.14

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表 2 CFRP芯层、GFRP皮层及CFRP@GFRP混杂复合材料杆体水吸收拟合度(R²)

Table 2. Degree of fitting R² of water uptake of CFRP core, GFRP shell and CFRP@GFRP hybrid composite rod

Type	20℃	40℃	60℃
CFRP core	0.99	0.94	0.96
GFRP shell	0.96	0.99	0.94
CFRP@GFRP	0.98	0.99	0.99

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表 3 CFRP@GFRP混杂复合材料杆体寿命预测的回归系数τ及R²

Table 3. Regression coefficient τ and R² of life prediction for CFRP@GFRP hybrid composite rod

Type	Immersion temperature/°C	τ	R²
CFRP core	20	310.2	0.98
	40	224.7	0.96
	60	178.6	0.96
GFRP shell	20	561.3	0.93
	40	337.5	0.98
	60	253.8	0.97
CFRP core/GFRP shell interface	20	641.4	0.92
	40	508.1	0.98
	60	360.5	0.97

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表 4 CFRP@GFRP混杂复合材料杆体寿命预测的回归系数E_a/R及R²

Table 4. Regression coefficient E_a/R and R² of life prediction for CFRP@GFRP hybrid composite rod

Type	Strength retention/%	E_a/R	R²
CFRP core	50	1350	0.99
	60	1350	0.99
	70	1350	0.99
	80	1350	0.99
	90	1350	0.99
GFRP shell	50	1 945	0.97
	60	1 945	0.97
	70	1 945	0.97
	80	1 945	0.97
	90	1 945	0.97
CFRP core/GFRP shell interface	50	1398	0.96
	60	1398	0.96
	70	1398	0.96
	80	1398	0.96
	90	1398	0.96
Notes: E_a—Activation energy of materials; R—Universal gas constant; R²—Degree of fitting.

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表 5 CFRP@GFRP混杂复合材料杆体剪切强度寿命预测的时移因子参数

Table 5. Time-shift factor for life prediction of interface shear strength for CFRP@GFRP hybrid composite rod

Type	T₀/°C	Time-shift factor
Type	T₀/°C	Shenyang Youth Bridge (T=8.8°C)	Jiangsu Yangtze River Bridge (T=15.9°C)	Hainan Century Bridge (T=26.9°C)
CFRP core	20	1.20	1.07	0.90
	40	1.61	1.43	1.21
	60	2.09	1.86	1.56
GFRP shell	20	1.30	1.09	0.85
	40	1.99	1.68	1.31
	60	2.89	2.44	1.90
CFRP core/GFRP shell interface	20	1.21	1.07	0.90
	40	1.64	1.45	1.22
	60	2.14	1.90	1.59
Notes: T—Annual mean temperature data from China Meteorological Observatory (www.nmc.cn) for 2019；T₀—Immersion temperature in the lab environment.

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