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Evaluating the Stability of a Metric for Determining the Health of Armor Plates

A technique for evaluating the stability of a metric for determining the health of armor plates is presented. The metric is based on the following basic premise: the amplitudes and frequencies of the major vibrational modes of an undamaged armor plate constitute a basic signature of the armor plate. Damaging the armor plate should cause changes to both the amplitude and frequency of the significant vibrational modes. A metric has been developed to exploit these changes in order to distinguish between an undamaged and a damaged plate.

Hellier, C., Handbook of Nondestructive Evaluation, McGraw-Hill Professional, New York, New York, 2001. Meitzler, T. J., G. Smith, M. Charbeneau, E. Sohn, M. Bienkowski, I. Wong and A. Meitzler, “Crack Detection in Armor Plates Using Ultrasonic Techniques,” Materials Evaluation, Vol. 66, No. 6, 2008, pp. 555–559. Mix, P. E., Introduction to Nondestructive Testing, John Wiley and Sons, New York, New York, 1987.
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