Document KJdpaK9X0eZQZKKk6Qq6eJnkr

V. D. Compton -5 - February 28, 1973 Bcndii 7133 linings were used on the front disc brakes, a material which has been noted as non-scoring and very low on rotor wear rate. Our testa showed radial thermal stress rupture cracks over the central region of both rotors, a caning of the friction faces, and abnormally high iron wear rates cn rubbing faces. The damage to the left rotor wes more severe in all aspects. Scoring was primarily on the two inboard faces. No abrasive action was found from FAST tests of surface or interior samples of the suspect linings. Tests by the Technical Services Department on scrapings from the rivet holes and lining edges revealed no suspect material. These scrapings were found to be only mildly abrasive and were non-scoring. Preliminary results from the Process Research Department revealed no substantial abnormalities in the cast iron. Die same test vehicle produced similar high lining wear, high rotor scoring after another 6000 CTM, using all nev brake parts. Examination of these failed parts produced similar findings, except the rotor coning was less and surface cracks were not present. Our conclusion was that the vehicle had experienced abusive usage which resulted in Forsterite formation on the rotors which subsequently imbedded in the linings and. acted (a a frangible abrasive to the rotors. Our past - dynamometer testa hare indicated rotor temperatures above U0C*F can produce this behavior. Personnel; Andersen VelntrsUb (Chemical Bigineerlng Department) y' * . Wet Clutch Analysis 1h previous theoretical analysis of the effects of surface roughness on the squeeze film behavior between two parallel annular discs has been further extended to consider the elastic deformation of the porous facing, numerical COATES V ? 0 C; 0 - ci: = PRODUCED BY FORD IN