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The literature about the fatigue of a spiral spring can scarcely be found as compared with that of the coiled helical spring, and the report of Mr. Kawada and Mr. Watanabe is the only one in our country. In compliance with a request of a maker of spring balancer in this district, the fatigue test of spiral spring was carried out, and some data were obtained. For this purpose, a testing machine with a shifting rod was used in our test, and the number of repetition in loading up to the fructure as well as the drop due to fatigue seen until the fructure takes place were carefully observed. From the result of the test, it has been found that in case of a repetition number of 5000 times, the spring dropped 2〜5 % in torque owing to the fatigue, and that a further drop could not be seen after that. It was attempted to make an experimental formula for the relation between the load drop and the number of repetition. The formula can only be applied to a range up to 5000 time repetition.
社団法人日本材料学会の論文
1961-08-15