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).
The thermal expansion coefficients and mechanical properties of various metals and alloys.
| Identifier | ExFiles\Box 149\4\ scan0342 | |
| Date | 31th May 1937 guessed | |
| - 4 - Electrolytic Copper.................. 16.7 x 10-6 Beryllium Bronze................... 16.3 x 10-6 Phosphor Bronze.................... 16.8 x 10-6 Brass 70/30........................ 18.9 x 10-6 Aluminium Bronze (10% Al.).......... 17.0 x 10-6 Iron (pure)........................ 11.0 x 10-6 Steel.............................. 10.5 - 11.6 x 10-6 Aluminium (pure)................... 25.5 x 10-6 Duralumin 'B'...................... - ditto - MECHANICAL PROPERTIES. The specimen taken as indicating typical figures for 2.5 per cent beryllium bronze was cut from a 3/4" diameter bar produced by extrusion under industrial conditions and made into the standard B.S.I. test piece, having an acting diameter of 0.564", and a gauge length of 2". Limit of Proportionality........... 37.5 tons per sq.inch. 0.1 per cent Proof Stress.......... 68.2 " " " Maximum Stress..................... 86.04 " " " Elongation (4 √a).................. 3.5 per cent. Vickers' Diamond Pyramid Hardness (1/10/15) ............. 360/380 Modulus of Elasticity 'E'..........9,000 tons per sq.inch. Other figures from beryllium bronze in the form of strips, wires and bar taken from routine works tests | ||