Numerical Derivation of Buckling Knockdown Factors for Isogrid-Stiffened Cylinders with Various Shell Thickness Ratios

Table 3

Properties of the equivalent models for the isogrid-stiffened cylinders with various shell thickness ratios.

Thickness ratio, ()	536 (441)	356 (300)	244 (200)	122 (100)
Radius, (m)	2.250	1.530	1.020	0.510
Length, (m)	2.200	1.500	1.000	0.500
Length of resin ring, (m)	0.083	0.056	0.035	0.019
Thickness of weld land, (m)	0.007
Equivalent thickness, (m)	0.0051
Equivalent elastic modulus, (GPa)	58.35
Poisson’s ratio,	0.33