All,

 

Here is the updated sheet with all runs thus far.  I have had some trouble with BC but I finally got it to run last t night.  BC has the worst shear force, no surprise there since we have always been using the shear stress on that region as the driving criteria for pin spacing, pucks etc.   Even with .4 friction, it still sees roughly 9 kips.  Len and I would highly recommend providing some protection for that stud via a collar of some sort.  

 

I still need to run three more cases where the inner leg  region near the inner bolts has slipped as well (since we have no way to retighten them)  Those should be done by Monday.  Len is wrapping up his memo and should have it completed by  next week, assuming we get the new bolt analysis done without any hiccups.

 

Also, Len and I are updating the type 1 and type 2 individual bolt models to reflect the as released drawings this week.  Should have something by tomorrow on that one.  Further I am working on the friction puck global model to take care of the problems on the inner portion of A (mickey mouse area) and moving the pucks slightly inward as well as refining the mesh around the pucks.  Also, I have devised a way to produce an average stress for each puck, and I am error checking that one.  

 

I have heard nothing this week on what is going on up there relating to the epoxy filled friction pucks, any status? Or as too any additional thought on positive shear connections, or cyclic loading of the friction coatings.  After speaking with several people on this,  I do wonder  how the alumina coating fails in compression, does it crack or powderiz (sp?).?   just wondering.....

 

Hope all is well up there.

 

 

Kevin

 

 

 

 

Kevin D. Freudenberg

Mechanical Design and Analysis

Oak Ridge National Laboratory

Fusion Energy Division

(865) 574-1310