The Proceedings of the Materials and Mechanics Conference
Online ISSN : 2424-2845
2016
Session ID : OS02-02
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Fatigue Fracture Mechanism of Thin Wires of Commercially Pure Iron under Cyclic Bending
Yuta ISHIMOTOHiroshi TANAKANaoto KUROKIYoshikazu NAKAI
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CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract

In the present study, fatigue fracture behavior of commercially pure iron thin wires with the diameter of 700 μm was investigated under cyclic bending by using a bending fatigue testing system developed for thin wires. At bending moment ratio Mmin/Mmax = -1, -0.8, -0.6 and -0.2, microscopic observation of fracture surface shows striations. Therefore fatigue cracks initiated at both the upper and lower surfaces and propagated toward the neutral axis of the specimen. On the other hand for tension-tension fatigue with the stress ratio R = 0.1, ratcheting failure and necking were occurred and the initiation and propagation of fatigue crack were not observed.

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© 2016 The Japan Society of Mechanical Engineers
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