NEW ABSORBING BOUNDARY CONDITIONS FOR FINITE-DIFFERENCE MODELING OF ELASTIC WAVES

The successful development of an effective NDE technique depends on a full understanding of the physics of ultrasound interaction with the test material. This can be best achieved through numerical simulation of the wave propagation and scattering in the test material. A good numerical model can supplement the information provided by laboratory measurements on manufactured faulty bonds. Numerical models provide controllable quantitative information, subject to their own limits on accuracy, but free from the uncertainties attached to many practical ultrasonic measurements.