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In-situ damage monitoring of a SiC/SiC ceramic matrix composite using acoustic emission and digital image correlation

机译：使用声发射和数字图像相关性对SiC / SiC陶瓷基复合材料进行现场损伤监测

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摘要

Continuous ceramic fiber reinforced ceramic matrix composites (CMCs) offer an innovative damage tolerant structural material for temperature regimes inaccessible to high temperature metals. However, when subjected to application environments, these materials exhibit damage and degrade over time depending on the severity of those conditions. The ultimate strength of CMCs is dictated by the properties of the load bearing fibers, but matrix cracking weakens the composite and can expose the load bearing fibers to harsh environments. The objective of the work performed was to develop a methodology for linking in situ detection of localized damage to final failure in continuous fiber reinforced CMCs. Initiation and growth of matrix cracking are measured and located linearly along the gage length via acoustic emission (AE) detection. High amplitude events at relatively low static loads can be associated with initiation of large matrix cracks. When there is a localization of high amplitude events in a given area, a measurable effect on the strain field can be observed. Full field surface strain measurements were obtained using digital image correlation (DIC). An estimation of the matrix cracking stress as well as localized areas of initiation were measured in real time. (C) 2016 Elsevier Ltd. All rights reserved.
机译：连续陶瓷纤维增强陶瓷基复合材料（CMC）为高温金属无法达到的温度范围提供了创新的耐损伤结构材料。但是，当受到应用环境的影响时，这些材料会随时间的流逝而严重损坏并降解。 CMC的极限强度取决于承重纤维的性能，但基体开裂会削弱复合材料，并使承重纤维暴露于恶劣的环境中。所开展工作的目的是开发一种方法，用于将连续损坏的原位检测与连续纤维增强CMC的最终故障联系起来。通过声发射（AE）检测来测量基体裂纹的萌生和扩展，并沿着应变片长度进行线性定位。在相对较低的静态载荷下发生的高振幅事件可能与大型基体裂纹的产生有关。当在给定区域中出现高振幅事件时，可以观察到对应变场的可测量影响。使用数字图像相关性（DIC）获得了全场表面应变测量值。实时测量基体破裂应力的估计值以及局部的引发区域。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Composite Structures》 |2016年第12期|245-251|共7页
  • 作者

    Whitlow Travis; Jones Eric; Przybyla Craig;

  • 作者单位

    Univ Dayton, Res Inst, Dayton, OH 45469 USA;

    US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA;

    US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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