鋼索の磁化に及ぼす応力の影響について
1967 年 83 巻 949 号 p. 744-748
詳細
1967 年 83 巻 949 号 p. 744-748
The studies of electromagnetic testing for wire ropes have hitherto been carried out, but as magnetic phenomena of wire ropes have not been sufficiently taken into account, the method cannot replace enlightened visual examination of ropes at work together with internal examinations of recapping samples and previously discarded ropes.
From the experimental work the following results were obtained;
(1) When tention was applied to a magnetizing steel wire or rope, inductance in low field was increased and in higher field was decreased.
(2) Villari effect of a steel wire or rope was depressed by the carbon content of it.
(3) The change of an electro-motive force in alternative field caused by the application of tention was usually much larger than the change of inductance in static field, i. e. when tensile stress of 30kg/mm2 was applied to the 6×7 rope magnetized at 5, 250AT/m, the decrease of electro-motive force was about-5.8% and indudqnce was about-3.2%.
