Further testing and development of simulation models for UT inspections of armor

Frank J. Margetan, Nathaniel Richter, R. Bruce Thompson
Calibration of measurement sensitivities of multiple micro-cantilever dynamic modes in atomic force microscopy using a contact detection method Rev. Sci. Instrum. 84, 023703 (2013) Note: A three-dimensional calibration device for the confocal microscope Rev. Sci. Instrum. 84, 016108 (2013) Chirped fiber Bragg grating detonation velocity sensing Rev. Sci. Instrum. 84, 015003 (2013) Superconducting quantum interference devices based set-up for probing current noise and correlations in
more » ... ions in threeterminal devices Rev. Sci. Instrum. 83, 115107 (2012) Spring constant calibration of atomic force microscope cantilevers of arbitrary shape Rev. Sci. Instrum. 83, 103705 (2012) Additional information on AIP Conf. Proc. ABSTRACT. In previous work we introduced an approach for simulating ultrasonic pulse/echo immersion inspections of multi-layer armor panels. Model inputs include the thickness, density, velocity and attenuation of each armor layer, the focal properties of the transducer, and a measured calibration signal. The basic model output is a response-versus-time waveform (ultrasonic A-scan) which includes echoes from all interfaces including those arising from reverberations within layers. Such A-scans can be predicted both for unflawed panels and panels containing a large disbond at any given interface. In this paper we continue our testing of the simulation software, applying it now to an armor panel consisting of SiC ceramic tiles fully embedded in a titanium-alloy matrix. An interesting specimen of such armor became available in which some tile/metal interfaces appear to be well bonded, while others have disbonded areas of various sizes. We compare measured and predicted A-scans for UT inspections, and also demonstrate an extension of the model to predict ultrasonic C-scans over regions containing a small, isolated disbond.
doi:10.1063/1.4716346 fatcat:lomap7rqy5a7tlje7gvzwsgevu