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).
Comparative strength and fatigue testing of different front pivot and wheel stub designs.
| Identifier | ExFiles\Box 2\B002_X168\ 00000001-page219 | |
| Date | 7th January 1914 | |
| X/68 J.{Mr Johnson W.M.} for R.{Sir Henry Royce} 7.1.14. De7/06114. Replying to your note RO{C. C. Rose - Export Manager}/90114 re Front Pivots, Mr. Hadin, Mr. Wormald and myself consulted in accordance with your note, examined sample pieces, and arranged to have impact tests taken on test pieces from heat treated stubs. We also arranged to have a nickel steel stub tried to compare with the nickel chrome, on the grounds that the high elastic limit and greater rigidity of the latter, might cause the effects of fatigue to appear more quickly. Some results are in to-day, but there are some more to come. With reference to the comparative strength of the stube on the previous standard F.3253 and the new wire wheel type F.3696/7 (F.3372/3) taking bending moments about the weakest point in each, the force of the blow stressing up to the elastic limit (taking 40 tons) is :- F.3253 - 18,000 lbs. F.3696 - 22,000 lbs. but the more flexible base in the case of F.3253 probably reduces this difference considerably. In an experiment Rer/Hyd/128d13, it was shewn that reducing the diamter of the stub right up to the U section, in the same manner as F.3372/3 | ||