Table 2: Natural frequencies of the split beam; DSM, FD-FEM, and standard FEM models.

Delamination Length Present DSMFEM; 6 elementsFEM; 10 elementsLayerwise FEM [6]
Mode 1Mode 2Mode 1Mode 2Mode 1Mode 2Mode 1Mode 2

Intact22.3961.6722.3661.61
0.520.8941.5220.8941.5720.8941.5520.8841.50
0.619.3041.0319.2941.0819.2941.0419.2841.01