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Impact of Adding Bolts to Inner Leg

Impact of Adding Bolts to Inner Leg. Data extracted from HM Fan’s ANSYS Model of Composite Modular, TF and PF Coils Impact of Added Bolts assessed by Post Processing, not direct Modeling. B. C. A. C. B. A. 3 of 3 bolts added at B – C joint. A. 3 of 7 bolts added at B – A joint.

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Impact of Adding Bolts to Inner Leg

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  1. Impact of Adding Bolts to Inner Leg Data extracted from HM Fan’s ANSYS Model of Composite Modular, TF and PF Coils Impact of Added Bolts assessed by Post Processing, not direct Modeling

  2. B C A C B A 3 of 3 bolts added at B – C joint A 3 of 7 bolts added at B – A joint 0 of 7 bolts added at A – A joint Per Tom Brown’s Study 3/17/06

  3. 3 of 3 bolts added at B – C joint A B C No problem with the 3 bolts as shown. 3 of 7 bolts added at B – A joint These 3 bolts are in the clear, located on one side of the CL. 0 of 7 bolts added at A – A joint If you need one for positioning, put one here. Per Tom Brown’sStudy Updated 1/31/07 A

  4. CC2 BC2 AB2 AA AB BC CC Friction Enhancement Helps in Regions in Compression (Blue) Note: Above does not include effect of preload from added bolts

  5. All Results for 2T High Beta Scenario

  6. Shear Loads Components at IL of MCWF Flanges Max Shear Top/Bot is 590 KN (133 Klbs)

  7. Compression Over Inboard Region

  8. Adding Bolts to Inner Leg Reduces Required Coefficient of Friction to 0.45 Based on Bolt Preload of 45797 lb at 80K Need to Update for Minimum Expected Preload

  9. Again, All Results for 2T High Beta Scenario

  10. Maximum Coefficient of Friction Required Outboard is under 0.25 Based on Bolt Preload of 45797 lb at 80K

  11. Conclusions – Based on Bolt Averages over Regions – No Peaking Assumed • If the coefficient of friction in the inboard region can be verifiably enhanced (ie with diamond grit) to 0.6 we should be OK and maintain the 0.15 margin the NCSX Design Requirements dictate. • At mu = 0.50, margin drops to 0.05 (ie 90% of Limit) • If we can provide a coefficient of friction of 0.4 in the outboard region, we should again be OK and again maintain the 0.15 margin the NCSX Design Requirements dictate. • If we can only provide a coefficient of friction of 0.3 in the outboard region, our margin is less but still positive, with the bolt shear capability providing some additional margin of safety (our belts and suspenders). • How do we fold this into criteria? Need to Understand Peaking due to gaps in bolting pattern

  12. ab2tl ab2tru aatl bc2tru bc2tl aatr cc2t ab2trl ab2int aaint cc2int bc2int bc2trl bc2bru ab2inb aainb cc2inb bc2inb ab2br aabr cc2b bc2brl aabl bc2bl ab2bl -60 deg 0 deg bctl abtl bctru cct abtr bcint bctrl ccint abint bcinb bctrl ccinb abinb abbru ccb bcbl abbrl bcbrl abbl +60 deg Shim Identifications

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