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).
Torsion tests on H-shaped and U-shaped test pieces and their fracture analysis.
| Identifier | ExFiles\Box 42\2\ Scan055 | |
| Date | 26th April 1917 | |
| R.R. 235a (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. BY/Btn1/P1.11.19. - 2 - Type A.{Mr Adams} This is an H shaped test piece, thus: GRIPS PURE TORSION APPLIED ON THIS CENTRE LINE. This fractured by shearing through the four small oil holes. This represents pure torsion on the journal, with the load applied on both sides of it. Type B. This is a U shaped test piece with loads applied approximately as on the shaft in service, thus:- GRIPS PURE TORSION APPLIED ON THIS C LINE. With this type of test piece in every case initial failure took place by fracture in tension at the point A.{Mr Adams} The web then always bent over and fractured in bending at B, and in some cases broke away also at C, through the plugged hole, the part between B & C coming right away. Autographic diagrams were taken for all test pieces, but owing to the scale of the test piece being rather small for the machine we are afraid these are not very reliable. However, they appear to show that both types of contd. | ||