纤维增强树脂复合材料-钢界面缺陷涡流热成像检测

邹星星; 马浩; 解社娟; 仝宗飞; 胡黎俐; 王辰昕; 王立彬

doi:10.13801/j.cnki.fhclxb.20220829.001

纤维增强树脂复合材料-钢界面缺陷涡流热成像检测

doi: 10.13801/j.cnki.fhclxb.20220829.001

1.
南京林业大学　土木工程学院，南京 210037
2.
西安交通大学　航天航空学院，西安 710049
3.
上海交通大学　船舶海洋与建筑工程学院　海洋工程国家重点实验室，上海 200240

基金项目: 江苏省自然科学基金-青年项目(BK20210620)；江苏省高校基金面上项目(21KJB560007)

详细信息

通讯作者:
王立彬，博士，教授，研究方向为桥梁加固与检测　E-mail：jhwlb@163.com

中图分类号: TU398
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- 被引次数: 0
出版历程
- 收稿日期: 2022-05-05
- 修回日期: 2022-07-13
- 录用日期: 2022-08-08
- 网络出版日期: 2022-08-30
- 刊出日期: 2022-11-01

Nondestructive testing of fiber reinforced polymer-steel interfacial defects based on eddy current thermography

1.
College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
2.
School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China
3.
State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Funds: Natural Science Foundation, Basic Research Program of Jiangsu Province, China (BK20210620); Natural Science Foundation of the Higher Education Institutions of Jiangsu Province, China (21 KJB560007)

摘要

摘要: 纤维增强树脂(Fiber reinforced polymer，FRP)复合材料已在钢结构加固中得到有效应用，但FRP-钢界面脱粘可能触发结构破坏，需无损检测以保证安全运营。基于自研涡流热成像(Eddy current thermography，ECT)系统对FRP-钢界面缺陷成像规律进行试验，并通过多物理场数值模拟揭示其内部生热和传热机制。试验测试了1个带缺陷试件在ECT下的温度响应，同时模拟了多个不同形状、位置和深度的界面缺陷对热成像的影响。试验表明：ECT系统能在80 s内精确检测试件中328 mm²的界面缺陷；边缘效应影响试件边缘和角部在加热阶段的检测精度，但在冷却阶段由于热量重分布而影响变小；热量沿深度方向传导造成的模糊效应降低了深层缺陷检测精度。本文的多物理场数值模型与试验结果吻合较好，并重现了ECT的边缘效应和模糊效应。基于数值模型的参数化分析，揭示了变化加热速率在一定范围内可克服边缘效应和模糊效应，提高FRP-钢内部缺陷探测精确度。
- 涡流热成像 /
- 界面缺陷 /
- 纤维增强树脂 /
- 无损检测 /
- 模糊效应
Abstract: Fiber reinforced polymer (FRP) has been effectively used in strengthening steel structures, but FRP-steel interfacial debonding may trigger structural failure. Hence nondestructive testing is required to ensure structural safety. Herein one specimen with FRP-steel interfacial debonding was detected based on a self-developed eddy current thermography (ECT) system, and its heat generation and heat transferring mechanism was revealed through multi-physical numerical simulation. The effect of different shapes, locations and shapes of the defect on the temperature response under ECT was investigated through simulation. The results show that the ECT system can accurately detect 328 mm² in the specimen within 80 s. The edge effect affects the detection accuracy of the edges and corners of the specimen in the heating stage, but it has little effect due to heat redistribution in the sample in the cooling stage. The blur effect caused by heat conduction along the depth direction reduces the detection accuracy of deep defects. Numerical simulation shows good agreement with the experimental tempera-ture response, and reproduces the edge effect and blur effect of ECT. Parametric study using numerical simulation reveals that the heating rate can overcome the edge effect and blur effect in a certain range and improve the accuracy of FRP-steel interfacial defect detection.
- eddy current thermography /
- interfacial defect /
- fiber reinforced polymer /
- nondestructive evaluation /
- blur effect

HTML全文

图 1 碳纤维增强树脂复合材料(CFRP)-钢试件构造

Figure 1. Structure of carbon fiber reinforced polymer (CFRP)-steel specimen

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图 2 CFRP-钢试件制造过程

Figure 2. Manufacturing process of CFRP-steel specimen

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图 3 涡流热成像(ECT)检测纤维增强树脂(FRP)-钢界面缺陷示意图

PC—Personal computer

Figure 3. Illustration of eddy current thermography (ECT) test on fiber reinforced polymer (FRP)-steel interfacial debonding

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图 4 人造缺陷和温度变化T_C对比图

T_C—Temperature variation; t—Time

Figure 4. Comparison between the man-made defect and temperature variation T_C field

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图 5 CFRP-钢试件在x和y方向的中心线的温度分布

Figure 5. Distribution of T_C along the centerlines in x and y direction of the CFRP-steel specimen

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图 6 多物理场数值分析模型示意图

Figure 6. Illustration of multi-physical numerical simulation

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图 7 CFRP-钢试件温度-时间曲线的试验和数值分析对比

Figure 7. Experimental and numerical analysis of temperature-time curves for CFRP-steel specimen

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图 8 CFRP-钢试件热成像图像对比图

Figure 8. Comparison of thermal imaging images of CFRP-steel specimen

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图 9 CFRP-钢试件缺陷布置(单位：mm)

Figure 9. Defect arrangement of CFRP-steel specimen (Unit: mm)

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图 10 不同钢板厚度的CFRP-钢试件温差

Figure 10. Temperature difference of CFRP-steel specimens with different steel plate thicknesses

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图 11 不同面积的CFRP-钢试件x和y方向中心线的温度分布

Figure 11. Temperature distribution of the center line in x and y directions for CFRP-steel specimens with different defect area

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图 12 不同缺陷位置的CFRP-钢试件x和y方向中心线的温度分布

Figure 12. Temperature distribution of the center line in x and y directions at different defect locations for CFRP-steel specimens

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图 13 不同形状缺陷的CFRP-钢试件x和y方向中心线的温度分布

Figure 13. Temperature distribution of the center line in x and y directions for CFRP-steel specimens with different defect shapes

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表 1 试件材性参数^[32]

Table 1. Material properties of specimens^[32]

Material	Electromagnetic properties	$ k $/(W·(m·K)⁻¹)	$ c $/(J·(g·K)⁻¹)	$ \rho $/(kg·m⁻³)
Foam	$ {\varepsilon _{\text{r}}} = 1 $	0.026	1.005	1.204
Epoxy	${\varepsilon _{\text{r} } } \approx 6-0.6{\rm{j} }$	1.000	3.700	1100
Steel	$ {\varepsilon _{\text{r}}} \approx 4.7 - 0.7{\rm{j}} $	1.700	0.800	2400
CFRP$ \parallel $	$ \sigma = {10^4} $	7.000	1.200	1600
CFRP$ \perp $	$ {\varepsilon _{\text{r}}} \approx 7 - 2.5{\rm{j}} $	0.800	1.200	1600
Notes: j—Imaginary unit; $ k $—Thermal conductivity; $ c $—Specific heat; ρ—Density; $ {\varepsilon _{\text{r}}} $—Relative permittivity; $ \sigma $—Electrical conductance; $ \parallel $ and $ \perp $ represent the horizontal and vertical directions of the fibers, respectively.

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表 2 试件缺陷详细尺寸

Table 2. Specimen detail size

Specimen	Defect types	Location	Area/mm²
OC	Octagon	Center	328
OC-M-1	Octagon	Center	656
OC-M-2	Octagon	Center	216
OC-M-3	Octagon	Center	56
OC-W-1	Octagon	Right	328
OC-W-2	Octagon	Lower right	328
SQ	Square	Center	400
RH	Rhombus	Center	100
CI	Circle	Center	314

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