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An experimental characterization of damping properties of thermal barrier coatings at elevated temperatures.

机译：隔热涂层在高温下的阻尼特性的实验表征。

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摘要

Modern gas turbine engines have routinely utilized thermal barrier coatings for the past three decades to coax greater thermodynamic efficiency out of jet engines. In service, it has been noted that these ceramic materials are also effective at suppressing high cycle fatigue in the engine components, increasing their respective fatigue life. Recent efforts have been made to mechanically characterize these materials; this has been a challenge as they are thin coatings, prone to history effects, and are materially nonlinear. Refinement of the apparatus have occurred and it is now desired to characterize them across a range of likely service temperatures.;A free-free beam apparatus has been adapted to accomplish this. Important to achieving viable results is the design, analysis, and experimental validation of the chamber in regards to the free-free specimen being heat-able, modally detuned and free-hanging, and the preservation of a non-contacting excitation method. Critical to success is ensuring a near-isothermal heated beam specimen. After successful validation and calibration of the chamber, a common thermal barrier coating, 8-YSZ, was tested, primarily using the free-decay, logarithmic decrement method, using the chamber from 70-900degF. Materially non-linear behavior was observed and findings of material storage modulus and loss coefficient that are consistent with previous studies were obtained. The chamber was also used to characterize the bare metal beam blanks and bond-coat only specimens. The apparatus was found to be sensitive when determining the storage modulus and damping, more so than the baseline configuration. This was due to changes in design to proof it against high temperature. Resulting, it clearly characterized the anisotropic modulus of titanium and determined that bond coating had a negligible contribution to the beam system. Design life criteria with the properties of the coating could now be adopted across a range of temperatures.
机译：在过去的三十年中，现代燃气涡轮发动机通常使用隔热涂层来哄骗喷气发动机提高热力学效率。在使用中，已经注意到这些陶瓷材料还有效地抑制了发动机部件中的高循环疲劳，从而延长了它们各自的疲劳寿命。最近已经进行了机械表征这些材料的工作。这是一个挑战，因为它们是薄涂层，容易受到历史影响，并且在本质上是非线性的。已经对设备进行了改进，现在需要在可能的使用温度范围内对它们进行表征。对于获得可行结果很重要的是，关于自由自由样本可加热，模态失谐和自由悬挂以及保持非接触激发方法的设计，分析和实验验证。成功的关键是确保近等温的加热光束样品。在成功验证和校准腔室后，主要使用自由衰减，对数递减方法（从70-900degF的腔室）对常见的隔热涂层8-YSZ进行了测试。观察到材料的非线性行为，并且获得了与先前研究一致的材料储能模量和损耗系数的发现。该室还用于表征裸金属束坯料和仅用于粘结涂层的样品。发现该设备在确定储能模量和阻尼时比基线配置更为灵敏。这是由于设计发生变化以证明其可以抵抗高温的缘故。结果，它清楚地表征了钛的各向异性模量，并确定了粘结涂层对光束系统的贡献可忽略不计。现在可以在一定温度范围内采用具有涂层特性的设计寿命标准。

著录项

  • 作者

    Easterday, Oliver T.;

  • 作者单位

    Air Force Institute of Technology.;

  • 授予单位 Air Force Institute of Technology.;
  • 学科 Applied Mechanics.;Engineering Materials Science.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 538 p.
  • 总页数 538
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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