The coupling between transverse and longitudinal vibration in an inhom
ogeneous beam has been formulated and discussed. A special case of bim
aterial split beam is solved to show the effect of delamination on the
natural frequency of the split beam. High sensitivity of the natural
frequency towards the size and location of the delamination is display
ed. In conjunction with other techniques, this sensitivity can be used
to locate and determine the size of delaminations in beam plates duri
ng inspection.