Dr. M. E. Barkey
Structural Durability and Fatigue Performance Group
at The University of Alabama

Pressure Testing of Recyclable Transmission Lines (RTL's)

Toledo Metal Spinning Cone Results--2005 Series

  RTL-main page   Barkey-Home page   Contact M. E. Barkey

Toledo Metal Spinning Cones
Eight cones were produced with a method called metal spinning.  These cones contain one vertical
weld seam, and one cirumferential (and angled) weld near the tip of the cone.  These cones are also
slightly thicker than the SNL cone.  Because of the manufacturing process, the appearance of these
cones are much more uniform than the SNL cone.  For the 2005 tests, a welded cap covered the tip
of the cone.
Pessure Test Results of the Toledo Metal Spinning Cones, 2005
    T01-2005 T02-2005   T03-2005   T04-2005    T05-2005   T06-2005

All values listed on these pages should be considered preliminary until listed in the final report.

Cone Designation Initial / Ultimate
Buckling Pressure (psi)
Measured Thickness(in) Notes:
T01-2005 1.25/1.25  0.031 pressure values from video only;
laser scans, strain gages
T02-2005 1.23/1.25   laser scans
T03-2005 2.50/--   luan stiffeners; global failure mode 
T04-2005 2.37/--   luan stiffeners; global failure mode
T05-2005 3.22/3.76   1/2 inch plywood stiffeners on the outside, intial buckling at the tip
T06-2005 3.62/4.52   1/2 inch plywood stiffeners on the inside, initial buckling a the tip, higher failure mode observed at increased load