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NSTX Supported by NSTX Centerstack Upgrade Project Meeting
P. Titus March PF4/5 Existing Support Analysis
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Weld Stresses Scaled From FEA Model Results and Coil Hoop Direction Stress Influence Coefficients
Link Model Used as a Place-Holder for New Column plus Sliding Block Weld Bracket Stresses are Small – Check Only Weld, Bolting, and Support Rod
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Lorentz Only 62 MPa Hot PF4/5+Lorentz 165 MPa Hot PF5+Lorentz 105 MPa Hot PF5+No Lorentz 72 MPa Hot PF4+Lorentz 98 MPa Hot PF4/5+No Lorentz 128 MPa
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Weld Stresses Scaled From Coil Hoop Direction Stress Influence Coefficient
FEA Weld Multiplier PF4/5 Weldment Nominal Weld = 5/16 in QA Effective Weld =1/4 FEA Weld Model Thickness =10 mm Weld Stress = Sigma * (.01*39.37/.25/.707) = Sigma * 2.22 FEA Lorentz Stress Scenario Multiplier Weld vs FEA Multiplier Weld Stress Mpa Weld Stress psi Lorentz Only at Corner Peak 62 2.2 Lorentz Only Away from Corner 27.5 Lorentz +Hot Coils at Corner Peak 165 Lorentz +Hot Coils Away from Corner 54 Weld Allowable based on Visual weld inspection 14ksi Weld Allowable based on Visual Plus Penetrant weld inspection 20ksi
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Weld Stresses Calculated From Weld Section Properties
Type A bracket Type B bracket
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3 in Type B bracket 10.5 in
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Type B bracket 3 in 10.5 in
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Type A bracket 3 in 10.5 in
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Weld Stresses Calculated From Weld Section Properties
Conservatively uses PF5 moment arm and .707 factor on ¼ in weld Worst Net PF4,5,U,L Moment Sum for 6 Supports (12 U&L), 10.5" Lever Section Modulus (in^3) Bending Stress (psi) psi Type A or B Bracket -81953 13.22 Type A Pad 47.87 Type B Pad 36.7 Fz(lbf) (PF4U+PF5U)+(PF4L+PF5L) Min w/o Plasma -81947 Min w/Plasma -81953 Min Post-Disrupt -58992 Min Worst Case Min Max w/o Plasma Max w/Plasma 17 Max Post-Disrupt 15 Max Worst Case Max 513255 From Charlie’s Design Point Spreadsheet
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PF 4 PF 5 Inspect Weld in this corner Inspect weld in this corner
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Clamp Bolts P/A calculations
Clamp Bolts are 1/2 inch. There will be 12 supports resisting the launching load on PF4 or 5 (This assumes up-down symmetry) Fz(lbf) PF4U PF5U PF4L PF5L Min w/o Plasma -78007 -49698 Min w/Plasma -63411 Min Post-Disrupt -89212 -20016 Min Worst Case Min -74506 Max w/o Plasma 78007 49698 180275 239929 Max w/Plasma 63403 145201 148314 150218 Max Post-Disrupt 133920 20017 89222 203119 Max Worst Case Max 149049 181133 415804 506937 Max Launching Load Load per Bolt(12*4 Bolts) Stress (Stress Area= .1416) PF4U 133920 2790 PF5U 145201 PF4L PF5L Worst Case Launching Load 149049 181133 -74506
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