A Dynamic Stiffness Element for Free Vibration Analysis of Delaminated Layered Beams

Table 2

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

Delamination Length	Present DSM		FEM; 6 elements		FEM; 10 elements		Layerwise FEM [6]
	Mode 1	Mode 2	Mode 1	Mode 2	Mode 1	Mode 2	Mode 1	Mode 2
Intact	22.39	61.67	—	—	—	—	22.36	61.61
0.5	20.89	41.52	20.89	41.57	20.89	41.55	20.88	41.50
0.6	19.30	41.03	19.29	41.08	19.29	41.04	19.28	41.01