NSTXNSTX Supported by

NSTX Centerstack Upgrade Project Meeting

P. Titus/EA Branch November 17, 2010

Lid/Cover/Flex

Aluminum Block Bolting Stress And Stresses with Proposed Reinforcements

Offsets Used to Impose Moments

Present Configuration

Present ConfigurationProduces High Bolt Stresses for the Upgrade Loads

The Upgrade PDR includes addition of a Reinforcing Plate

Postulated Weld

Tresca Stress in Umbrella Structure Plate

Present Configuration

ProposedReinforcement

No Reinforcement

With Proposed Welded Reinforcement Plate

Preloaded Bolt Reinforcement

~90000psiPreload Bolt Stress is About the Same

Welds

Extend these “Wings”

Welds

When the OOP force reaches 25% of nominal, the spoke lid springs upward

Spoke/Lid/Flex/Von Mises Stress peaks at 17.8ksi

Danny’s Crown Tooth Analysis

He added a radius and we re-oriented the fiberglass reinforcement – but we need the updated design.

Maybe Ali can addIn TF Flag Calc?