Abstract
Ceramic bearing balls have great potential for replacing steel bearing balls in most applications because of their lower weight, larger strength at high temperatures, and abundance of raw materials. However, ceramic materials are brittle, and the advantages of ceramic parts can be lost if small surface cracks and bulk defects are present in part. This work will report on a method we developed to detect small sub-micron surface cracks in ceramic bearing balls. We present a theory to calculate the scattering from these small “trenches” or cracks, and we will present an amplitude and phase measuring acoustic microscope capable of detecting these defects. Finally, we will present a signal processing scheme that enhances the contrast in images obtained on curved surfaces.KeywordsPhase ImageAcoustic BeamAmplitude ImageAcoustic MicroscopeBulk DefectThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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