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).
Continuation of a report on the analysis of leaf spring characteristics and performance.
| Identifier | ExFiles\Box 80\2\ scan0175 | |
| Date | 30th June 1920 | |
| DA{Bernard Day - Chassis Design}23/CB30-6-20 contd. (4). The length of time taken to break a leaf depends primarily on the stress set up as above, and secondly on the Brinell hardness of the plates, which vary in the springs we have examined, over a wide range. We expect to find, when we have completed our analysis, that the length of duration varies inversely as the stress and directly on the hardness within limits. (5). We find that when we take the actual thickness of the plates, the new way of calculating brings the spring to exactly the weight proved by experiment. The older method, which we formerly used, gave results considerably too low. (6). We find by calculation that provided the thickness of each leaf is constant, the leaves cannot react except their ends, and at the central clip. This is independent of the relative thickness of the various plates. (7). In the meanwhile we have sample sets of springs on order, having a thick main plate and other leaves of a less, but constant, thickness and with square ends, so that we may bump them by comparison with the pre-war springs. DA.{Bernard Day - Chassis Design} | ||