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).
Fatigue limit diagram for special cold drawn spring steel #12, with stresses calculated by Wahl formula.
| Identifier | ExFiles\Box 158\4\ scan0076 | |
| Date | 10th October 1936 guessed | |
| FINAL STRESS, THOUSAND LBS. PER SQ. INCH. INITIAL STRESS, THOUSAND LBS. PER SQ. INCH. ENDURANCE LIMIT ELASTIC LIMIT 1T 2 3T 4 5T 6 NO. 1, 3, 5, BROKEN NO. 2, 4, 6, UNBROKEN Figure 13. Fatigue Limit Diagram for Special Cold Drawn Spring Steel #12. All stresses calculated by Wahl formula. | ||