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首页> 美国政府科技报告 >Composite heat damage spectroscopic analysis. Part 1, Mechanical testing of IM6/301-6 laminates: Part 2, Laser-pumped fluorescence spectroscopic studies on IM6/3501-6 laminates: Part 3, Diffuse reflectance infrared fourier transform spectroscopic studies
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Composite heat damage spectroscopic analysis. Part 1, Mechanical testing of IM6/301-6 laminates: Part 2, Laser-pumped fluorescence spectroscopic studies on IM6/3501-6 laminates: Part 3, Diffuse reflectance infrared fourier transform spectroscopic studies

机译：复合热损伤光谱分析。第1部分，Im6 / 301-6层压板的机械测试：第2部分，Im6 / 3501-6层压板的激光泵浦荧光光谱研究：第3部分，漫反射红外傅里叶变换光谱研究

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The Oak Ridge National Laboratory/Applied Technology Division (ORNL/ATD) has successfully demonstrated the unique applicability of two spectroscopic techniques that possess the capability of detecting heat damage in IM6/3501-6 laminates and correlation of this damage with the residual mechanical-strength properties. The results on the diffuse reflectance infrared fourier transform (DRIFT) and laser-pumped fluorescence (LPF) spectroscopic techniques, which are capable of rapid, in-service, non-destructive detection and quantitation of heat damage in IM6/3501-6 laminates, is presented. Both of these techniques have been shown to be quite effective at probing the elusive and complex molecular changes that take place in IM6/3501-6 laminates subjected to varying degrees of thermal degradation. Using LPF or DRIFT techniques, it has been shown that laminates having different thermal histories can be readily differentiated from one another due to their characteristic ''fingerprint'' spectral features. The effects of short-term, elevated temperature heating on the room- temperature compressive interlaminar-shear, and flexural strengths and room-temperature shore-D hardness properties of ''dry'' and ''wet'' preconditioned IM6/3501-6 laminates are discussed. Additionally, the geometrical changes and percent-weight-loss measurements of IM6/3501-6 laminates that accompany heat damage are also examined. It was found that below a certain temperature/time exposure threshold, these laminates visually and microscopically appeared to be undamaged but, in fact, may have lost a significant percentage of their original strength. In addition, laminates that were exposed above the temperature/time exposure threshold suffered dramatic geometrical changes and large amounts of weight loss. 32 refs., 39 figs., 10 tabs.

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