S0301-3-7 より線の疲労強度とその破壊挙動(疲労き裂進展と疲労強度)

概要

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A twisted wire is manufactured by two or more wires being spirally wound. For example, even if a twisted wire is subjected by axial tensile stress, each wire is subjected by complex stresses and the frictional load from other wires. A twisted wire shows a little lower fatigue life than a single wire in low cycle fatigue region, while it shows almost the same fatigue life in high cycle fatigue region. That is because the frictional loads between wires superimposed on the fatigue stress only activate at low cycle fatigue. The wires in a twisted wire subjected to bending stress don't stick but slip each other. Each wire is bended in the same curvature radius and is subjected to the same bending stress. Therefore strengthening a single wire directly contributes to the production of the high strength twisted wire.
2009-09-12