鉱山用鋼索の切断荷重と伸びの研究

抄録

In the wire rope stretch there are two kinds involved; one is stretch on service and the other is stretch which occurs during breaking test. The stretch under breaking test is distinguished constructional stretch, elastic stretch and plastic stretch. In this study the stretch under breaking test of 6×7 lang lay rope will be discussed. Namely ropes, which have been respectively abraded, made broken wires, corroded and made deformation experimentally, are put to breaking test, then relations between percentage loss of breaknig strength and stretch are induced and shown in curves. more than two hundred of ropes which have been used on mines are inspected, and from breaking test, relations between percentage loss of breaking strength and stretch are got. Classify these by Their cause of deterioration, namely (A) abrasion, (B) broken wire, (C) corrosion, (D) deformation, these relations are shown in curves respectively.
From above, standard curves for 6×7 rope are induced.
These curves vary by type of deterioration within a definite range.
It will be seen that there are a close connection among the type of deterioration, percentage loss of breaking strength and elongation under breaking test.