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 PoP Cone Results

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Toledo Metal Spinning Cones
PoP Cones.
Pessure Test Results of the Toledo Metal Spinning PoP Cones, 2005

    PoP-T01     PoP-T02     PoP-T03        PoP-T04    PoP-T05s   PoP-T06s    PoP-T07s   PoP-T08s    PoP-T09s  PoP-T10s

    PoP-T11s    PoP-T12s    PoP-T13s      PoP-T14s    PoP-T15s   PoP-T16s   PoP-T17s      PoP-T18s   PoP-T19s   PoP-T20

    PoP-T21   PoP-T22
 

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) Stiffeners? Stiffener Configuration Notes:
PoP-T01  8.45/8.45  0.025 No --  Laser Scans--pretest, 2 psi
PoP-T02  8.36/8.36   No --  Laser Scans--pretest
PoP-T03  8.07/8.07   No --  Strain Gages
PoP-T04  8.26/8.26   No --  
PoP-T05s  19.6/22.4   Yes (5) A Stiffened Cone (catastrophic failure; rapid loading; pre-test laser scans);
second row of buckles formed at 21.3 psi
PoP-T06s  19.4/20.3   Yes (5) A Stiffened Cone (progressive ring bond failure; slower loading, cycled load; initial buckling behavior was near elastic; laser scans, pre-test, post-test, during test)
 PoP-T07s  17.4/22.2   Yes (5) A Stiffened Cone, no laser scans, strain gages, no ring failure, three rows of buckles
 PoP-T08s  18.7/22.4   Yes (5) A Stiffened Cone, no laser scan, no strain gages, two rows of buckles, plastic collapse upon re-loading
 PoP-T09s   21.9/--    Yes (4) B Stiffened Cone, no laser scan, no strain gages, two rows of buckles,
did not collapse
PoP-T10s  21.9/--   Yes (4) B Stiffened Cone, laser scans, no strain gages, two rows of buckles,
did not collapse
PoP-T11s  25.6/--   Yes (3) C  0-100 psi pressure transducer used, total collapse, 3 rows of buckles
PoP-T12s  26.2/--
(appears to be stiffener failure)		   Yes (3) C no saved data; 0-100 psi pressure transducer used, total collapse; appears to be defect initiated ring failure
PoP-T13s  26.1/--   Yes (3) C 0-100 psi pressure transducer used, total collapse, 3 rows of buckles
PoP-T14s  22.1/26.1   Yes (3) D  0-100 psi pressure transducer used;
initial buckling pressure determined from video and pressure file
PoP-T15s  23.1/28.6   Yes (3) D  0-100 psi pressure transducer used;
nitial buckling pressure determined from video and pressure file
PoP-T16s  19.2/19.7   Yes (2) E  0-100 psi pressure transducer used;
nitial buckling pressure determined from video and pressure file
PoP-T17s  18.3/18.8   Yes (2) E  0-100 psi pressure transducer used;
nitial buckling pressure determined from video and pressure file
PoP-T18s  14.0/--   Yes (1) F  0-100 psi pressure transducer used
PoP-T19s  14.1/--   Yes (1) F  0-100 psi pressure transducer used
PoP-T20s reserved for future use        
PoP-T21s reserved for future use        
PoP-T22s sent to SNL        



 

Stiffener Configuations
 


A

Five Stiffeners, 1/4 inch thick luan plywood, ring thickness 1 1/4 inch except where noted
 

Stiffener location from large end of cone, measurements
Number vertical locationto middle of ring, by subtracting 1/2 ring thickness (in.)
1 (largest) 3.875
2  7.625
3 10.875
4 14.375
5 (smallest) 18.125


 
 
 
 
 


B

Four Stiffeners, 1/4 inch thick luan plywood, ring thickness 1 1/4 inch
 

Stiffener location from large end of cone, measurements
Number vertical location to middle of ring, by subtracting 1/2 ring thickness (in.)
1 (largest) 3.125
2  7.375
3 11.125
4 (smallest) 15.375

 


 
 
 


C

Three Stiffeners, 1/4 inch thick luan plywood, ring thickness 1 1/4 inch except; largest ring was 3/4 inch thickness
 

Stiffener location from large end of cone, measurements
Number vertical location to middle of ring (in.)
1 (largest)                      0.75 in. thickness 2.625
2                                   1.25 in. thickess 6.375
3 (smallest)                    1.25 in. thickness 11.75

 


 
 


D

Three Stiffeners, 1/4 inch thick luan plywood, ring thickness 1 1/4 inch except; largest ring was 3/4 inch thickness
 

Stiffener location from large end of cone, measurements
Number vertical location to middle of ring (in.)
1 (largest)                      0.75 in. thickness 2.74
2                                   1.25 in. thickess 5.89
3 (smallest)                    1.25 in. thickness 10.22


 
 
 
 


E

Two Stiffeners, 1/4 inch thick luan plywood, ring thickness 1 1/4 inch
 

Stiffener location from large end of cone, measurements
Number vertical location to middle of ring (in.)
1 (largest)                      1.25 in. thickness 3.125
2                                   1.25 in. thickess 8.0

 


 
 
 


F

One Stiffener, 1/4 inch thick luan plywood, ring thickness 1 1/4 inch
 

Stiffener location from large end of cone, measurements
Number vertical location to middle of ring, measurement (in.)
1                                           1.25 in. thickness 5.50