From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Tensile strength and hardness test results for brake drums cast with steel centre plates.
| Identifier | ExFiles\Box 120\1\ scan0231 | |
| Date | 19th October 1937 | |
| 1028. Mr. Knegg, Iron Foundry. AFM.{Anthony F. Martindale} Do you like this structure Rm.{William Robotham - Chief Engineer} c.c. to BY.{R.W. Bailey - Chief Engineer} c.c. to RHC.{R. H. Coverley - Production Engineer} c.c. to Rm.{William Robotham - Chief Engineer} c.c. to Rm{William Robotham - Chief Engineer}/Mr. Martindale. c.c. to H.E.S. M.1,447 H1/EJW.1/GS.19.10.37. BRAKE DRUMS CAST WITH STEEL CENTRE PLATES. Further to Reports M.1,400 and M.1,426. Tests have been made on samples broken from a drum and submitted by you as representing a set of drums cast for experimental purposes. Tensometer tensile tests gave the following results :- Test Bar marked. Ultimate Strength Tons/sq.in. Brinell Hardness. T 16.5 252 L 16.5 253 The micro-structure is illustrated by the attached photomicrographs. The graphite is evenly distributed in short flakes and the matrix consists chiefly of finely laminated pearlite and sorbite, with small unconnected areas of phosphide eutectic. H1/EJW. | ||