3.00E+07
2.50E+07
STop-Flow
Maximum Stress
S2.00E+07
m Side-Flow
g Maximum Stress
c 1.50E+07
S-Ultimate Material
o Strength
o- 1.OOE+07
0
-J
5.00E+06
O.OOE+00
Vinyl-Flow Series Number
Figure 5.3 Maximum stresses in each simulation and ultimate material strength
5.4 Geometry Deformation Results
Figures 5.4 through 5.6 show various views of a typical deformed geometry of a
cage subject to top-flow at the critical wrinkle point. All eight tubes bend in the negative
z-direction with maximum z-deflection occurring at half the tube length. Bending plus
the Poisson effect cause the cage diameter to decrease symmetrically throughout the
cage.
Figures 5.7 through 5.8 show two views of a typical deformed geometry of a cage
subject to side-flow at the critical wrinkle point. Note that the net cage x-diameter
increases, while the net cage y-diameter decreases. Internal reaction forces occurring
through the cable connections cause internal bending moments around the corner
connectors of the octagon. Deformation effects of these internal bending moments are
visible in the deformed curvature around the connectors and account for multiple-mode
bending visible in several of the beams. Figure 5.9 illustrates the rotational effect on a