A calibration procedure for sonic infrared nondestructive evaluation
A calibration procedure for sonic infrared nondestructive evaluation
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DOI：
10.1063/1.3169518
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发表时间：
2009-07
影响因子：
3.2
通讯作者：
M. Morbidini;P. Cawley
中科院分区：
文献类型：
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作者：
M. Morbidini;P. Cawley
声红外是一种潜在的非常有吸引力的无损评价技术，提供了快速检测复杂部件的可能性。然而，目前很难确保已经施加了足够的激励，使得可以信任零（不存在缺陷）结果。本文提出了一种标定方法，以提高该技术的可靠性。该方法在测试期间使用对部件的振动的测量，振动信号被处理以给出“加热指数”，该加热指数是振动场在存在的任何感兴趣的缺陷处产生热量的能力的量度。描述了加热指数的计算及其制定的基本原理。然后将该方法应用于两组具有不同尺寸裂纹的梁状试件。在一个给定的试样上的连续测试的最大温升示出相关性以及与最大加热指数，从而验证该方法。所需的临界加热指数...
Sonic infrared is potentially a very attractive nondestructive evaluation technique offering the possibility of rapid testing of complex components. However, at present it is difficult to be sure that sufficient excitation has been applied so that a null (no defect present) result can be trusted. This paper presents a calibration method to improve the reliability of the technique. The method uses a measurement of the vibration of the component during the test, the vibration signal being processed to give a “heating index” which is a measure of the ability of the vibration field to generate heat at any defects of interest that are present. The calculation of the heating index and the rationale for its formulation are described. The method is then applied on two sets of beamlike specimens with cracks of different sizes. The maximum temperature rise in successive tests on a given specimen is shown to correlate well with the maximum heating index, so validating the method. The threshold heating index required...