Flash Lamp Heat Flux Requirements For Thermographic Inspection Of Fiber Composite Laminates
Flash Lamp Heat Flux Requirements For Thermographic Inspection Of Fiber Composite Laminates
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纤维复合材料层压板热成像检测的闪光灯热通量要求
DOI：
10.1117/12.953401
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
T. J. Murray
中科院分区：
文献类型：
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作者：
S. Cowell;D. Burleigh;T. J. Murray
一个数值近似被用来确定一个热成像摄像机的能力，以检测石墨环氧树脂复合材料的面板中的缺陷，而激励是由一个特定的，市售的高能量脉冲氙气闪光灯能够重复脉冲600 J每个提供。建立了复合材料壁板的三维数学模型。该面板由八层组成，并包括植入的圆形缺陷。模拟的缺陷包括分层、重叠和分层插入。在模拟的第一秒期间，向样品的前表面施加六个0.2毫秒持续时间的热脉冲。由于面板内部存在缺陷，样品的后表面上出现温度变化，这导致热量以修改的速率扩散通过样品。最小温差为0.18 °F（0.1 °C），可通过热成像相机检测到。本研究的目的是确定是否购买氙气闪光灯系统的热成像无损检测（NDT）的石墨环氧树脂层压板的保证。
A numerical approximation was used to determine the ability of a thermographic imaging camera to detect defects in a panel of graphite epoxy composite while excitation is provided by a specific, commercially available high-energy pulsed xenon flash lamp capable of repetitive pulses of 600 J each. A three-dimensional mathematical model was developed, which simulated the composite panel. The panel consisted of eight plies and included implanted circular defects. Defects modeled included delaminations, overlaps, and teflon inserts. During the first second of the simulation, six heat pulses of 0.2 msec duration were applied to the front surface of the sample. Temperature variations appear on the rear surface of the sample due to the presence of defects inside the panel, which cause the heat to diffuse through the sample at modified rates. A minimum temperature difference of 0.18 °F (0.1 °C) was detectable by the thermal imaging camera. The purpose of this study was to determine whether the purchase of a xenon flash lamp system was warranted for thermographic nondestructive testing (NDT) on graphite epoxy laminates.