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NSTX. Supported by. NSTX Centerstack Upgrade Project Meeting P. Titus Feb 3, 2010. Dome Rib Tab Weld Stress Removing TF OOP Support to the Vessel. Design Point PF Forces. /title,PF4 and PF5 Upper Worst Power Supply Loads Plus TF OOP Loads bf,all,temp,20

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Nstx

NSTX

Supported by

NSTX Centerstack Upgrade Project Meeting

P. Titus Feb 3, 2010

Dome Rib Tab Weld Stress

Removing TF OOP Support to the Vessel


Design point pf forces

Design Point PF Forces


Nstx

/title,PF4 and PF5 Upper Worst Power Supply Loads Plus TF OOP Loads

bf,all,temp,20

f,985,fz,-168089/12/.2248 !PF1c

f,402,fz,-194414/11/.2248 !PF2

f,4588,fz,-100000 !Umb Foot

f,4588,fy,60000

f,1237,fz,-303940/11/.2248 !PF3

solve


Nstx

Weld Allowable

From the NSTX Criteria:

  • For welds in steel, the design Tresca stress shall be the lesser of:

    • 2/3 of the minimum specified yield if the weld at temperature, or

    • 1/3 of the minimum specified tensile strength of the weld at temperature.

From the AISC Criteria:

For shear on an effective throat of a fillet, For 304 Stainless, the weld metal is annealed, or the base metal in the heat effected zone is annealed. and Estimate 241*21/36 = 140 MPa = 20 ksi (without weld efficiency)

This is consistent with NSTX Criteria of 2/3 yield or 2/3 of 30ksi for annealed 304

With a weld efficiency of .7 the allowable is 14ksi, or 96 MPa

For fillets divide weld area by sqrt(2)


Rib tab weld evaluation for worst case power supply loads

Rib Tab Weld Evaluation forWorst Case Power Supply Loads

Actual Weld Detail

Assume bevel backed by a fillet is like a full penetration. Tab weld Stresses all appear less than 96 MPa


Sri checked vessel stresses with correct nb port and han s worst oop loads vessel stress is ok

Sri Checked Vessel Stresses with Correct NB Port, and Han’s Worst OOP Loads – Vessel Stress is OK.


Tf stress no outer leg oop support

TF Stress, - No Outer Leg OOP Support

Note Scenarios beyond around #50 died due to filled disk


Oop displacement no outer leg oop support

OOP Displacement, - No Outer Leg OOP Support


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