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).
Results of loading and deflection tests on a shock absorber.
| Identifier | ExFiles\Box 152\1\ scan0108 | |
| Date | 17th February 1933 guessed | |
| -2- the angle plate with the lever arm projecting horizontally to the left, so that the torque applied would be reversed. Loading and unloading was carried out as before. During the first loading the deflection curve was not a straight line, and the total deflection was considerably more than previously. After removing the load there remained a permanent deflection of .014". A second loading and unloading in this direction produced deflection curves which are practically straight lines, and coincident. The permanent deflection remained at .014". The resulting curves are plotted on Diagram L30 attached, in which loads are measured horizontally and deflection vertically. The dotted curves refer to the first loading with the lever to the right, and the full line curves refer to the second loading with the lever to the left. The sequence and direction of the various curves are indicated by arrows and Roman numerals. From these results it is concluded that there was no plastic deflection at all up to the maximum load applied, and that the permanent deflection recorded in the two cases was due to the rotor spindle taking up the clearance in its bearings in the working chamber. It will be seen that the maximum elastic deflection recorded in either direction under a load of 200 lbs is .064" or say 1/16". Apart therefore from movement due to the taking up of bearing clearance, the elastic deflection on the reversal of the load from +200 lbs to -200 lbs would be 1/8". The shock absorber on which these tests were made has a figure 8 typed on the central boss of the screwed plug closing the working chamber, and is now in Mr. Coleman's possession. After conclusion of these tests, a second shock absorber which had been prepared in a similar way was loaded beyond the limits of the above test. At a load of approximately 300 lbs, plastic deformation set in. The deflection as shown by the clock micrometer could be seen gradually but steadily increasing for a considerable period without the application of any additional load. The maximum load applied was about 400 lbs, and this produced a permanent set of over .1". W. a. {Mr Adams} Green | ||