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FINITE ELEMENT ANALYSIS OF NSTX FLAG JOINT DESIGN

FINITE ELEMENT ANALYSIS OF NSTX FLAG JOINT DESIGN. Irving J. Zatz August 7, 2003. FEATURES OF FEA MODEL. INCLUDES ALL ESSENTIAL STRUCTURAL COMPONENTS CONTRIBUTING TO FLAG JOINT PERFORMANCE FLAGS - BOXES COLLAR - HUBS CENTER STACK - BOLTS SPLINES - UMBRELLA etc.

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FINITE ELEMENT ANALYSIS OF NSTX FLAG JOINT DESIGN

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  1. FINITE ELEMENT ANALYSIS OF NSTX FLAG JOINT DESIGN Irving J. Zatz August 7, 2003

  2. FEATURES OF FEA MODEL • INCLUDES ALL ESSENTIAL STRUCTURAL COMPONENTS CONTRIBUTING TO FLAG JOINT PERFORMANCE • FLAGS - BOXES • COLLAR - HUBS • CENTER STACK - BOLTS • SPLINES - UMBRELLA • etc.

  3. FEATURES OF FEA MODEL • NON-LINEAR VARIABLE CONTACT ALONG FACE OF JOINT • CONTACT PRESSURE CAN BE ACCURATELY MONITORED • ANY LOSS OF JOINT CONTACT CAN BE DETECTED • FRICTION COEFFICIENT CAN BE SPECIFIED

  4. FEATURES OF FEA MODEL • SHEAR KEY & PRE-LOADED BOLTS • CAN ACCURATELY DETERMINE AXIAL AND/OR SHEAR LOAD TRANSFER TO COPPER AND INSERTS

  5. LOAD CASES EXAMINED • START OF FLAT TOP (SOFT) • END OF FLAT TOP (EOFT) • END OF PULSE (EOP)

  6. ANALYTICAL ASSUMPTIONS • STATIC ANALYSIS - DOES NOT ACCOUNT FOR FATIGUE AND CREEP EFFECTS • TOLERANCES ARE PERFECT (e.g., FLAG-TO-TURN FLATNESS) • FIT-UPS ARE PERFECT (e.g., FLAG-TO-BOX POTTING)

  7. LOAD CASE (35) • BOLT PRE-LOAD 5000 LBS/BOLT • 6 kG EM LOADS-(with FLEX EFFECT) • EOFT TEMPERATURES • 0.4 FRICTION ASSUMED

  8. LOAD CASE (35C) • BOLT PRE-LOAD 5000 LBS/BOLT • 6 kG EM LOADS-(with FLEX EFFECT) • EOFT TEMPERATURES • 0.2 FRICTION ASSUMED

  9. LOAD CASE (34C) • BOLT PRE-LOAD 5000 LBS/BOLT • 6 kG EM LOADS-(with FLEX EFFECT) • EOFT TEMPERATURES • NO FRICTION ASSUMED

  10. LOAD CASE (35B) • BOLT PRE-LOAD 5000 LBS/BOLT • 6 kG EM LOADS-(with FLEX EFFECT) • SOFT TEMPERATURES • 0.4 FRICTION ASSUMED

  11. LOAD CASE (35D) • BOLT PRE-LOAD 3000 LBS/BOLT • 6 kG EM LOADS-(with FLEX EFFECT) • SOFT TEMPERATURES • 0.4 FRICTION ASSUMED

  12. LOAD CASE (35E) • BOLT PRE-LOAD 5000 LBS/BOLT • NO EM LOADS • END-OF-PULSE TEMPERATURES • 0.4 FRICTION ASSUMED

  13. SUMMARY OF RESULTS

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