ワイヤーロープの静的試験および繰返し引張疲労試験
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概要
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The objected of this experimental research was to decide the quality of several kinds of wire ropes of different sectional patterns under the static and the pulsating loads. Especially, the authors placed great emphasis on the latter case, and clarified the relations between the cycles of load repetitions and the elongation of wire ropes. Fatigue tests were made under the pulsating tensile load of +500kg〜+5000kg, using the Losenhausen fatigue testing machine Type UHS. The wire ropes tested were of the following six kinds : Filler tpye of Hemp core (abbreviated to H. C.) arid Rope Core (abbreviated to R. C.) ; Special Seale type of H. C. and R. C ; and Warrington type of H. C. and R. C.. The Diameter of all wire ropes was 16 mm in nominal size. Measurements on the elongation of wire rope during the progress of load repetitions were taken, using the Tanabe Deflectometer, with the cyclic interval, as a rule, with 2 5000 cycles interval of load repetitions. Main results obtained are as follows. (I) The fatigue failure of wire rope occurred in the neighbourhood of the socket of alloy metal where the most remarkable twist was observed during the testing. (2) The relation between the elongation of wire rope and the number of cycles of loading formed a line, almost straight in most cases, on the semi-log graph, until the element wire failed, in which the abscissa was taken as the logarithm of the number of cycles. After the element wire failed, the elongation of the wire ropes gradually a remarkable increase, which got higher and higher showed the elongation which increased more and more until the strand failed, and they endured more than 20000 load cycles. (3) The order of durability of the wire ropes for the repeating load of +500kg〜+5000kg was as follows : Special Seale type of R. C. (the best) ; The same of H. C. ; Filler type of R. C. ; The same of H. C. ; Warrington type of R. C. ; The same of H.C.. (4) The rate of increment of wire rope elongation accompamying the progreass of cycles of 10ad repetitions increase as for each wire rope in the following order : Warrington type of R. C. ; Special Seale type of R. C. ; Filler type of R. C. ; Special Seale type of H. C. ; Filler type of H. C. ; Warrington type of H. C.. (5) Comparing the group R. C. with that of H. C., the durability for fatigue of R. C. group was superior to that of H. C. group. On the contrary, the rate of increment of the elongation of R. C. group was inferior to that of H. C. group.
- 1958-03-15
著者
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