Vibration Analysis of Plate with Irregular Cracks by Differential Quadrature Finite Element Method

Table 1

Natural frequencies of rectangular plates with several classical boundary conditions and T-shaped, L-shaped, and I-shaped cracks.

Types	Mode numbers
	1	2	3	4	5	6	7	8	9
T-shaped; CCCC	4.6809	5.2512	6.5963	8.7289	10.3130	14.5327	17.5577	17.9553	19.8488
	4.6640	5.2355	6.5828	8.7118	10.3050	14.5200	17.5550	17.9550	19.8507
L-shaped; FCFC	0.4842	1.5996	2.4210	3.0750	3.8014	4.8670	5.8165	6.8436	7.7874
	0.4892	1.5991	2.4196	3.0661	3.7987	4.8616	5.8049	6.8421	7.7821
I-shaped; CFFF	0.2382	0.2675	1.3373	1.5138	1.8848	2.1912	3.7463	4.2576	5.7725
	0.2146	0.2930	1.3338	1.5195	1.8827	2.2125	3.7466	4.2565	5.7554

Results from ANSYS.