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- W4313128030 abstract "Abstract This paper gives the recommended procedure for fatigue testing hot-wound helical compression springs in complete detail, so that any competent research technician, with only an elementary knowledge of spring theory, can successfully carry out a program of fatigue tests on helical springs, with practically no other guidance than the instructions laid down in the Code. This has been proved by actual trial. The test procedure is planned to develop a complete S-N diagram for each group of variables, instead of merely an endurance limit. In the actual plotting of the S-N diagrams, the Committee has developed a technique based on probability theory, which has been included in the Code recommendations. The type of formula used is assumed. The precision measurements and test methods prescribed in the Code permit the computation of relative stresses in the test springs to a high order of accuracy. It would seem reasonable to assume that there is a mathematical equation representing the S-N relation, the formulation of which awaits an exact determination of the statistical laws controlling the formation and propagation of fatigue cracks. The Committee feels that a studied guess at the correct form of equation is a constructive move. If results indicate that the guess is approximately correct, the use of such a formula has the important advantage that without it the research consists of a series of successive approximations to the correct value of the endurance limit, a quantity obviously immune to exact measurement. In testing helical springs, this procedure is very tedious and expensive, on account of the slow speeds to which we are limited. On the other hand, if the test data are fitted to a probable S-N diagram, every observation makes a considerable contribution to the correctness of the graph, and only one or two of the runs need be prolonged beyond 1,000,000 cycles of stress." @default.
- W4313128030 created "2023-01-06" @default.
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- W4313128030 date "1941-08-01" @default.
- W4313128030 modified "2023-09-30" @default.
- W4313128030 title "Recommended Code of Procedure for Fatigue Testing of Hot-Wound Helical Compression Springs" @default.
- W4313128030 doi "https://doi.org/10.1115/1.4019542" @default.
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