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XXVIII.—An Apparatus for inducing Fatigue in Wires by means of repeated Extensional and Rotational Strains, with the Effects produced by such Fatigue in the Laws of Torsional Oscillation

Published online by Cambridge University Press:  15 September 2014

J. B. Ritchie
J. B. Ritchie*
Affiliation:
University College, Dundee
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Extract

In the preceding paper the law of torsional oscillation

yn(x + a) = b,

where y = range of oscillation, x = number of oscillations since start of experiment, and n, a, b constants for any one experiment, is considered with reference to wires of various materials, together with the effects produced on the constants of that empirical equation, and in particular on the constant n, by altering the initial conditions of the experiment. The wires were subjected to changes of length, diameter, temperature, and rigidity, and the resultant changes in the values of n, a, and b were given in detail.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh , Volume 31 , 1912 , pp. 440 - 447
Copyright
Copyright © Royal Society of Edinburgh 1912

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References

page 446 note * This value, 3·36, got for the line lying along the points of the first oscillations, is quite abnormal, and the wire used in this experiment was examined to discover, if possible cause of the unusual value of n. A repeated experiment gave the same result. The wire was then halved, and each half tested separately. Change of length has been shown to have no effect on the values of n or a.

Each half tested gave values as follows:—

(1) a = ·5, n = 2·00 and 2·80

(2) a = ·5, n = 2·04

for first oscillations, and curve for rest, which could not be fitted with one straight line.

This latter half was then again halved, and the two small parts tested. Again the two parts were found to give different results, and the abnormality was traced to one of the quarters.