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Nondestructive Evaluation (NDE) for Characterizing Oxidation Damage in Cracked Reinforced Carbon-Carbon

机译：表征裂纹增强碳碳的氧化损伤的非破坏性评估（NDE）

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In this study, coated reinforced carbon-carbon (RCC) samples of similar structure and composition as that from the NASA space shuttle orbiter's thermal protection system were fabricated with slots in their coating simulating craze cracks. These specimens were used to study oxidation damage detection and characterization using nondestructive evaluation (NDE) methods. These specimens were heat treated in air at 1143 C and 1200 C to create cavities in the carbon substrate underneath the coating as oxygen reacted with the carbon and resulted in its consumption. The cavities varied in diameter from approximately 1 to 3mm. Single-sided NDE methods were used because they might be practical for on-wing inspection, while X-ray micro-computed tomography (CT) was used to measure cavity sizes in order to validate oxidation models under development for carbon-carbon materials. An RCC sample having a naturally cracked coating and subsequent oxidation damage was also studied with X-ray micro-CT. This effort is a follow-on study to one that characterized NDE methods for assessing oxidation damage in an RCC sample with drilled holes in the coating.
机译：在这项研究中，制造了与美国宇航局航天飞机的热保护系统结构和成分相似的涂层增强碳-碳（RCC）样品，并在涂层中开槽模拟了裂纹。这些标本用于使用无损评估（NDE）方法研究氧化损伤的检测和表征。这些样品在空气中于1143 C和1200 C进行热处理，当氧气与碳反应并消耗碳时，在涂层下方的碳基材中形成空腔。腔的直径从大约1到3mm不等。使用单面NDE方法是因为它们可能在机翼检查中很实用，而X射线微计算机断层扫描（CT）用于测量腔体尺寸，以验证碳-碳材料正在开发的氧化模型。还使用X射线微型CT研究了具有自然开裂涂层和随后的氧化损伤的RCC样品。这项工作是对NDE方法的后续研究，该方法采用NDE方法评估带有涂层钻孔的RCC样品中的氧化损伤。

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