Finite Element Modeling of Laminated Composite Plates with Locally Delaminated Interface Subjected to Impact Loading

Table 2

Natural frequencies of the first eight mode shapes.

Mode sequence number	1	2	3	4	5	6	7	8
Shi et al. (2004) [4]	23.249	38.825	55.37	59.814	72.984	85.337	101.53	104.6
Present study	23	37	53	58	77	84	96	103
Difference, %	1.1	4.7	4.28	3	5.21	1.56	5.45	1.53