Table 5.

Constitutive stiffness matrix $A_k$ for the DW model without perforation.

		A & B			B & D			R
		1	2	3	1	2	3	4	5
A & B	1	3313.8	593.33	0	1117.1	195.90	0
	2	593.33	2967.5	0	196.36	1200.6	0
	3	0	0	1077.8	0	0	409.89
B & D	1	1117.1	196.36	0	20 619	3620.8	0
	2	195.90	1200.6	0	3620.8	15 042	0
	3	0	0.0	409.89	0	0	5934.5
R	4							233.13	0
	5							0	242.28