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MCWF Toroidal Joint Concerns. Present analysis (HM’s EM loads & Cooldown) shows the Toroidal Joints requires a coefficient of friction in excess of 0.3 to prevent slipping Predominantly inboard, unbolted regions, though some outboard, bolted regions as well (when bolt preload is included)

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Mcwf toroidal joint concerns
MCWF Toroidal Joint Concerns

  • Present analysis (HM’s EM loads & Cooldown) shows the Toroidal Joints requires a coefficient of friction in excess of 0.3 to prevent slipping

    • Predominantly inboard, unbolted regions, though some outboard, bolted regions as well (when bolt preload is included)

  • The NCSX Structural Design Criteria calls for demonstrating structural integrity at m +/- 0.15

    • For m = 0.3, mmin = 0.15

    • Basis for 0.3 assumption unclear

  • Allowing inboard region to slip (assuming zero friction) results in outboard region failing to meet criteria.


Identification of shim segments used for force summations
Identification of Shim Segments used for Force Summations

ab2tl

ab2tru

aatl

bc2tru

bc2tl

aatr

cc2t

ab2trl

bc2trl

aain

cc2in

ab2in

bc2in

bc2bru

ab2br

aabr

cc2b

bc2brl

aabl

bc2bl

ab2bl

-60 deg

0 deg

bctl

abtl

bctru

cct

abtr

bctrl

bcin

ccin

abin

bctrl

abbru

ccb

bcbl

abbrl

bcbrl

abbl

+60 deg

Green Regions (*in) unbolted


Baseline analysis shows il wants to slip
Baseline Analysis Shows IL wants to Slip

CC BC AB AA AB BC CC

Data counter-clockwise within block, ending at inner leg




Notes
Notes

  • Cases run letting the Inner Leg slip are Linear analyses:

    • Softened out-of-plane shear modulus

    • Conductor bonded to MCWF

    • Wings not bonded (free)

  • Analyses run without bolt preload

    • Effect of preload added afterwards

    • Assumes 45797 #/bolt at 80K and joint stiffness ratio kb/(kb+km) = 0.118

  • MCWF Structure Only included

    • How will inclusion of TF structure impact MCWF joints?

    • Test Cases run with rigid constraints (more than can be achieved)


Test case constraining mcwf top and bottom in z and theta
Test Case Constraining MCWF Top and Bottom in z and theta

The best we can do to stiffen MCWF – but not achievable




Summary
Summary

  • Need to understand what coefficient of friction can be achieved within Toroidal Joints

    • Is there any test data to support using .3 or possibly higher?

    • Do we need to consider other mechanisms for carrying shear?

  • Is the bolt at the limit for preload? If not, can other components also withstand more?

  • Including TF Structure may help rigidity a bit, but not likely to be enough.

    • Probably should still generate composite model if doable to remove uncertainties.