复合材料蜂窝板积水的脉冲热像检测的研究

Abstract

Abstract: The mechanism of pulsed thermography (PT) for water detection in aviation composite honeycomb panels is studied by numerical simulation and experiment. A new 3-D heat conduction model of water detection in honeycomb panels is presented; the relationships between information parameters and water are analyzed for three testing modes, i.e. detecting from the near-water side, detecting from the far-water side and detecting as the honeycomb panel is vertically laid. The basic laws of water detection from the near-water side are verified by a PT experiment. The results indicate that, in the three testing modes, both the maximum temperature difference and maximum contrast are non-linear functions of water height, and will increase as the increment of the water height. The detection sensitivity is the highest from the near-water side, followed by the vertically laid honeycomb panel, and the far-water side is the lowest. Both water ingress and glue have similar influence on the surface temperature. Therefore, they cannot be distinguished by the temperature difference curve or the maximum temperature difference information. The water height can be evaluated inversely by the curves of the information parameters vs water height. The results obtained can provide technical support for water detection and evaluation of aviation honeycomb structures by PT.

Key words: infrared imaging, thermography, nondestructive testing, modeling building, simulation, honeycomb structure, water ingress

CLC Number:

GUO Xingwang, ZHANG Feifei, LIU Yingtao. Study on Pulsed Thermography for Water Ingress Detection in Composite Honeycomb Panels[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2012, (6): 1134-1146.

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Study on Pulsed Thermography for Water Ingress Detection in Composite Honeycomb Panels

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