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).
Stress-strain diagram for Special Tempered Steel #11, showing both tension and torsion curves.
| Identifier | ExFiles\Box 158\4\ scan0075 | |
| Date | 10th October 1936 guessed | |
| STRESS, THOUSAND LBS. PER SQ. INCH. TENSION CURVE TORSION CURVE INCHES ELONGATION DEGREES TORQUE Figure 12. Stress-Strain Diagram for Special Tempered Steel #11. Ultimate strength 194,000 P.S.I. Tension Ultimate strength 155,000 P.S.I. Torsion Elastic Limit 160 000 P.S.I. Tension Elastic Limit 100 000 P.S.I. Torsion Elongation 8" 6.2%, 2" - 9.3% Reduction of Area 50.6%, Rockwell 42 1/2 C | ||