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).
Laboratory report on the failure of an O.S. Rear Damper Lever from a Wraith Bumper Chassis.
Identifier | ExFiles\Box 119\1\ scan0175 | |
Date | 31th January 1939 | |
1024. Kennington M.1784. Rm{William Robotham - Chief Engineer}/FWK from H1/EJW. Laboratory. H1/EJW. 1/JM.{Mr Morley} 31.1.39. O.S. Rear Damper Lever FW.1200 from Wraith Bumper Chassis. Rm{William Robotham - Chief Engineer} (FWK. 16/JH. 6.1.39.) This S/N lever failed after 42 hours on the bumper test. The fracture - see photo.M.1784/1 indicates failure in fatigue from the sharp edge at "X". Magnetic crack test and subsequent micro-examination, revealed two more cracks in this edge about half an inch from the fracture. These were of the nature of small laps - note the oxide and decarburisation in photomicrograph M.1784/2 and M.1784/3. The Brinell hardness was 295 and the micro-structure apart from the laps mentioned was quite satisfactory. H1/EJW. | ||