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

Table 1

Properties of the baseline isogrid-stiffened cylinder [31].

Property	Value
Thickness ratio, ()	536 (441)
Radius, (m)	2.250
Length, (m)	2.200
Length of resin ring, (m)	0.083
Length of a triangular unit cell, (m)	0.360
Height of a triangular unit cell, (m)	0.415
Thickness of stiffener, (m)	0.004
Thickness of skin, (m)	0.004
Effective thickness, (m)	0.0042
Equivalent thickness, (m)	0.0051
Thickness of weld land, (m)	0.007
Depth of stiffener, (m)	0.008
Angle of stiffener,	60°
Elastic modulus, (GPa)	73.1
Poisson’s ratio,	0.33