Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 03, 2023 - September 06, 2023
Wire ropes for cranes which is widely used in the construction and manufacturing industries must be replaced periodically to prevent the wire ropes break. According to the Structural Standards for cranes, wire ropes must be replaced or disposed when break 10% of the wire constitute the wire ropes. However, the number of broken wires cannot to be investigated accurately, because it is difficult to observe the inside of the wire ropes by visual inspection. Therefore, it is considered that clarification of the relationship between loading history and residual strength of wire ropes can be used as a disposal criterion for wire ropes, regardless of the number of broken wires. In this study, the relationship between loading history and residual strength of wire ropes tested by S-bend fatigue was clarified for IWRC 6×Fi(29), a wire rope commonly used in cranes. And the criteria for disposal based on the damage degree of wire ropes is investigated. The relationship between the residual strength of the wire rope subjected to cyclic S-type bending fatigue and the damage degree is shown that the residual strength of the wire rope subjected to 75% damage degree was equivalent to the breaking force based on JIS G 3525. In order to continue to use the wire rope with the breaking force based on JIS G 3525 and safety factor generally satisfied, it is considered that the wire rope may be better disposed of when the damage dgeree of the wire rope reaches 75%.
