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Initial Results from Friction Material Testing

NCSX. Initial Results from Friction Material Testing. January 29, 2007. A traditional tension/compression testing machine has been configure to pull “double shear” combinations. Side rams allow the application of normal (transverse) loads. Testing Setup.

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Initial Results from Friction Material Testing

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  1. NCSX Initial Results from Friction Material Testing January 29, 2007

  2. A traditional tension/compression testing machine has been configure to pull “double shear” combinations. Side rams allow the application of normal (transverse) loads Testing Setup

  3. A 0.38” thick x 1.00” wide center element receives the application of friction-encouraging medium (if any) Wider (1.50”) side plates are added to each side of the center element with an axial overlap of 1.0” The normal/transverse load (10 kip max) is added at the center of the overlap areas (2 in**2 total area) Typical Test Combination

  4. File 070129Summary.xls lists the outcomes of 21 trials G-10 on SS (ambient,1 trial) m=0.18 SS on SS (amb/cold, 4 trials) m=0.21-0.26 SS/diamond/SS (amb/cold, 16 trials) mavg=0.53 Many combinations The fundamental failure in the diamond-assisted trials was the tearing of the seated diamonds along/through the surface of the stainless The tear-outs look like aerial views of perfectly plowed fields This may be the functional limit of the material Test Observations

  5. The machine assembly personnel will probably find the 100/120 grit diamond (6 mil) on each side of the final shims to be the easiest to cope with during precision assembly. The 0.004 shim stock with diamond approach would allow last-minute changes in shim thicknesses No lag time for off-site processing after shims are sized Assembly personnel would have bigger uncertainties with 4x12mil vs. 2x6mil when getting things “in tolerance” The nickel-bound diamond show NO degradation after failure Relative mag perm 1.7<mrel<1.9 Good cycle test candidate? Desirability/Negatives

  6. EKAgrip-Ceradyne (plant in Germany, US office in Michigan) is applying diamond to 0.004 SS shim as a parallel test to complement our current Braziler-supplier shims. NCSX will pick a relevant pressure range and produce a plot (pressure vs. m) for one or two selected front runners. Stellaloy – will the manganese improve things? Cycle testing at 80K Next Steps

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