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首页> 外文期刊>Optical engineering >Damage characterization in dimension limestone cladding using noncollinear ultrasonic wave mixing
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Damage characterization in dimension limestone cladding using noncollinear ultrasonic wave mixing

机译：非共线超声波混合对尺寸石灰石覆层的损伤表征

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摘要

A method capable of characterizing artificial weathering damage in dimension stone cladding using access to one side only is presented. Dolomitic limestone test samples with increasing levels of damage were created artificially by exposing undamaged samples to increasing temperature levels of 100℃, 200℃, 300℃, 400℃, 500℃, 600℃, and 700℃ for a 90 min period of time. Using access to one side only, these test samples were nondestructively evaluated using a nonlinear approach based upon noncollinear wave mixing, which involves mixing two critically refracted dilatational ultrasonic waves. Criteria were used to assure that the detected scattered wave originated via wave interaction in the limestone and not from nonlinearities in the testing equipment. Bending tests were used to evaluate the flexure strength of beam samples extracted from the artificially weathered samples. It was observed that the percentage of strength reduction is linearly correlated (R~2 = 98) with the temperature to which the specimens were exposed; it was noted that samples exposed to 400℃ and 600℃ had a strength reduction of 60% and 90%, respectively. It was also observed that results from the noncollinear wave mixing approach correlated well (R~2 = 0.98) with the destructively obtained percentage of strength reduction.
机译：提出了一种方法，该方法能够仅通过使用一侧来表征尺寸石材覆层中的人工风化破坏。通过将未损坏的样品暴露在100℃，200℃，300℃，400℃，500℃，600℃和700℃的升高的温度水平下90分钟，来人工制作破坏程度不断增加的白云石石灰石测试样品。仅使用一侧，使用基于非共线波混合的非线性方法对这些测试样品进行了非破坏性评估，该方法包括混合两个临界折射膨胀超声波。使用标准来确保检测到的散射波是由石灰岩中的波相互作用引起的，而不是由测试设备中的非线性引起的。弯曲测试用于评估从人工风化样品中提取的梁样品的弯曲强度。观察到强度降低的百分比与样品暴露的温度呈线性相关（R〜2 = 98）。注意，暴露于400℃和600℃的样品的强度降低分别为60％和90％。还观察到，非共线波混合方法的结果与破坏性获得的强度降低百分比相关性很好（R〜2 = 0.98）。

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