Finite Element Simulation Analysis of Nondestructive Testing Parameters in Line Laser Scanning Thermal Imaging
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摘要:
为进一步研究线激光扫描红外热成像无损检测技术，探究检测过程中可调参数及被检材料参数对热成像结果的影响，以获取最佳缺陷检测效果。本文使用COMSOL软件建立线激光扫描碳纤维复合材料的有限元分析模型，选取缺陷中心处及无缺陷处表面最大温差作为衡量检测效果的特征量，分析线激光长度、缺陷大小及缺陷深度对CFRP（Carbon Fibre Reinforced Plastics）热成像结果的影响规律，并分别对3个参数与检测效果的关系进行拟合。研究可为搭建激光扫描热成像检测系统和制定准确可靠的检测标准提供参考。
Abstract:To further study the nondestructive testing technology of line laser scanning IR thermography, the effects of adjustable parameters and tested material parameters on the thermal imaging results was explored to obtain the best defect detection results. COMSOL software was used to establish a finite element analysis model of line laser scanning carbon fiber composite materials, and the maximum surface temperature difference between the defect center and non-defect area was selected as the characteristic quantity to measure the detection effect. The influence of the linear laser length, defect size, and defect depth on the thermal imaging results of carbon fiber reinforced plastics (CFRP) was analyzed, and the relationship between the three and the detection effect was fitted. This study provides a reference for the establishment of a laser scanning thermal imaging detection system and accurate and reliable detection standards.
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图 3 COMSOL仿真建模和网格划分结果
Figure 3. Results of COMSOL simulation modeling and mesh division
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图 5 线激光加热后部分时刻材料表面温度分布
Figure 5. Temperature distribution of material surface at some time after linear laser heating
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图 8 缺陷直径与最大温差拟合图
Figure 8. Fitting diagram of defect diameter and maximum temperature difference
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图 10 不同缺陷深度表面温差图
Figure 10. Surface temperature difference map of different defect depths
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图 11 缺陷深度与最大温差拟合图
Figure 11. Fitting diagram of defect depth and maximum temperature difference
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图 12 l=10 mm、16 mm、20 mm、24 mm表面温度图
Figure 12. l=10 mm, 16 mm, 20 mm, 24 mm surface temperature diagram
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图 13 l=8 mm、10 mm、12 mm、14 mm参考点表面温度图
Figure 13. Surface temperature diagram of l=8 mm, 10 mm, 12 mm, 14 mm reference points
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图 14 l=40 mm、50 mm、60 mm、80 mm表面温度图
Figure 14. l=40 mm, 50 mm, 60 mm, 80mm surface temperature diagram
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图 15 l=40 mm、50 mm、60 mm、80 mm表面温差图
Figure 15. l=40 mm, 50 mm, 60 mm, 80 mm surface temperature difference map
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图 16 线激光长度与最大温差拟合图
Figure 16. Fitting diagram of line laser length and maximum temperature difference
表 1 材料属性参数
Table 1 Material property parameters
Properties Density ρ/(kg/m3) Specific heat
capacity c/(J/(kg·K))Thermal conductivity
k/(W/(m·K))CFRP 1536 865 kx=4.2
ky=0.56
kz=0.56Air 1.186 1005 0.0261 
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表 2 缺陷直径与最大温差数据转换表
Table 2 Data conversion table of defect diameter and maximum temperature difference
Defect diameter D/mm Maximum temperature difference ΔTmax/℃ Original value Normalized value(x) Original value Normalized value(y) 15 1 46.92 1 10 0.6667 45.92 0.9787 5 0.3333 44.013 0.938 3 0.2 41.912 0.83999
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表 3 缺陷深度与最大温差数据转换
Table 3 Data conversion table of defect depth and maximum temperature difference
Defect depth h/mm) Maximum temperature difference ΔTmax/℃ Original value Normalized value (x) Original value Normalized value (y) 3 1 4.118 0.1923 2 0.6667 4.591 0.2144 1 0.3333 8.535 0.3986 0.5 0.1667 21.411 1
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表 4 线激光长度与最大温差数据转换表
Table 4 Line Laser length and maximum temperature difference data conversion table
Laser length l/mm Maximum temperature difference ΔTmax/℃ Original value Normalized value(x) Original value Normalized value(y) 80 1 1.033 0.3125 60 0.75 1.523 0.4607 50 0.625 2.125 0.6428 40 0.5 3.306 1
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