CABLE BENDING FATIGUE LIFE PREDICTION METHOD AND DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a cable bending fatigue life prediction method and a device for the same, capable of easily predicting the bending fatigue life of a cable even if a bending condition is changed.;SOLUTION: A cable bending fatigue life prediction method includes the following steps of: creating an SN chart and a fatigue limit chart at the time of simple bending in advance; obtaining a minimum stress σ_min loaded on a cable from a maximum radius of curvature R₁ at the time of bending of the cable of which life is to be predicted, and obtaining an average stress σ_m1 which is an average stress σ_m0 corresponding to a fatigue limit σ_w0 at the time of simple bending added with the minimum stress σ_min by using the fatigue limit chart; obtaining a fatigue limit reduction rate α from the ratio of a fatigue limit σ_w1 corresponding to the obtained average stress σ_m1 to the fatigue limit σ_w0 at the time of simple bending; obtaining an SN chart when the maximum radius of curvature is R₁ by multiplying the SN chart at the time of simple bending by the obtained fatigue limit reduction rate α; and predicting the bending fatigue life of the cable by using the obtained SN chart.;COPYRIGHT: (C)2012,JPO&INPIT