Engineering department test report detailing the particulars and results of a wear test on material strips.
| Identifier | ExFiles\Box 26\4\ Scan327 | |
| Date | 20th October 1926 | |
| N. P. L. ENGINEERING DEPARTMENT TEST MARK = DHQ.1. SENDERS MARK T(C). The method of test and apparatus used was described in our Report of October 20th., 1926, ref. DCP/CJ. The material was supplied in one piece moulded to about 10" radius, measuring 8 1/2" long by 3" wide by 0.34 thick. From this four strips each 3" x 3/4" were cut for the test. Particulars of Test Strips. No. Dimensions Inches. Thickness; Inches. Specific Gravity. Before test. After test. Before test. After test. DHQ.1.(a) 2.97 x .740 .341 .313 2.29 2.27 DHQ.1.(b) 2.97 x .740 .341 .313 2.29 2.27 DHQ.1.(c) 2.98 x .740 .347 .325 2.26 2.25 DHQ.2.(d) 2.98 x .741 .346 .316 2.29 2.27 .34375 .31675 2.28 2.26 Average wear = 0.027 inch. Area of Test Strips = 8.807 sq.inches: Duration of Test = 6 hours: Total work absorbed in 6 hours = 62,080,000 ft. lbs. = 7,049,000 ft. lbs/sq.inch. Average rate of absorption of work = 5.23 H.P. Wear figure = wear in inches for the absorption of one million ft. lbs. of work per sq. inch = 0.0038 inch. RECORD OF TEST. Time Load: lbs. Speed; Ft. Temp.at end Coefficient of Friction hour hour per sq.in. per Min. of run oC. Max. Min. Mean. 0 to 1 13.6 4490 67 .31 .25 .28 1 to 2 " 4530 69 .33 .32 .32 2 to 3 " 4510 68 .38 .31 .325 3 to 4 " 4520 68 .40 .32 .325 4 to 5 " 4530 70 .35 .31 .325 5 to 6 " 4460 67 .40 .31 .325 13.6 4510 68 1/2 .32 | ||
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).