NSTX Supported by NSTX Centerstack Upgrade Project Meeting P. Titus March 30 2011 Insulation Short...
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Transcript of NSTX Supported by NSTX Centerstack Upgrade Project Meeting P. Titus March 30 2011 Insulation Short...
![Page 1: NSTX Supported by NSTX Centerstack Upgrade Project Meeting P. Titus March 30 2011 Insulation Short Beam Tests Failure Modes Ripple Loads on PF PF4/5.](https://reader034.fdocuments.us/reader034/viewer/2022052607/5a4d1b677f8b9ab0599b118d/html5/thumbnails/1.jpg)
NSTXNSTX Supported by
NSTX Centerstack Upgrade Project Meeting
P. Titus March 30 2011
Insulation Short Beam Tests – Failure Modes
Ripple Loads on PFPF4/5 Existing Support Analysis
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Top flag Von Mises Top flag hoop stress
315 MPa (45.7 ksi) 257 MPa (37.3 ksi)73.7 MPa (10.7 ksi)
Han Zhang Current Diffusion/Thermal/Stress Model
We Expect De-Lamination
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We Expect De-Lamination
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Figure 33 - Bonded tape delaminated from copper turn
Figure 34 - Sleeve of bonded glass fiber tape where copper turn slid out
TFTR D&D PROJECTFINAL EXAMINATION AND TESTING
OF THE TFTR TF-COILSDecember 18, 2002
Irving J. Zatz
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•Broke at only 100 lbs•Broke at Kapton Bonds•Withstood 21kV after air gap tracking fixed.
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U.S. ITER Large-Scale Compression-Fatigue Tests of CS Coil Insulation 27 June 2008
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Stresses Due to OH2 Reverse Current Fault, Alcator C-Mod Belleville
Preload is Applied as Nodal Forces on the Top of the model
Analysis Predicted De-Bonding but Not Failure
Inspection Showed Crazing Here
No Operational Problems have been Experienced
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Conclusion:
Some De-Lamination is Expected
Parting Planes must be predictable and not Cause Tearing of Fiberglass Insulator
OH Kapton Interleaved Insulation Will Part Reliably – Like Old ITER Design
Recent Measured Results for the CTD 425 System Show Preferential Failures at Copper Bond Surface, But Sufficient Shear Strength to Support TF Torsional Loads
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WithPlasmaNo Plasma
Without Existing Support Strut
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With Existing Support Strut
180 Mpa or 26ksi is Marginal for Static Weld AllowablePresent 96 Scenarios produce ~22 ksi (next Slide)Won’t Pass Fatigue.
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Results from Influence Coefficient Multiplication for Sx in RSYS 5 (cylindrical).
With No Column This Stress Can be Considered from PF5 Loads Only
+13kA/- 24 kA Scenario from Latest ( as of March 2011)Design Point Spreadsheet
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Present Column Doesn’t Do Much and Doesn’t Compare Well with the Added 3.5 inch Column
Could we Replace it?
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TF Ripple Loads – Figure Created by Subtracting the PF+TF Load File from the PF Only File, Then Plotting Only PF Loads
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TF Ripple Loads on PF 4 and 5 Upper
Plotted with TF leg Segments to Show Torque Loading Near the TF Legs
TF Ripple Loads on PF Coils are Included in Willard’s, Han’s, Andrei’s and Titus’ Loads – But not Influence Coefficient Calculations.