Abstract
Pulsating tension fatigue tests were made of some full scale machine parts, such as PC wire strand 1×4, 1×7 and 1×19, wire rope 6×19, steel wire, tie rod, etc.……. As a result of these tests, it has been found that the stress amplitude of fatigue strength sometimes drops as low as less than 5kg/mm2, which is rather small values as laboratory fatigue test results.It is often experienced that real fatigue strength of machine parts is much lower than what is expected from the fatigue test results of standard smooth specimens. The authors expect that the laboratory fatigue test result reported in the present paper will be of help in estimating the fatigue strengths of full-scale machine parts under service conditions.
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