The Proceedings of the Materials and Mechanics Conference
Online ISSN : 2424-2845
2017
Session ID : OS0540
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Controlling Factor of Multiaxial Fatigue Crack Initiation and Crack Growth and Crack Growth Mechanisms at Elevated Temperatures
*Takeshi ISOGAIShogo ISSHIKIYuuki TAKAHASHI
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Abstract

Under multiaxial loading conditions, high temperature fatigue crack growth tests for SUS 304 stainless steel were conducted. In this study, effects of applied stress level and specimen geometry on multiaxial fatigue crack growth were investigated experimentally. DC electrical potential drop method was applied to the thin-walled cylindrical specimen subjected cyclic tension and torsion. Controlling factor of multiaxial crack initiation and fatigue crack growth are examined. Fatigue crack growth characteristics changes with the combined stress condition, Δτ/Δσ. Under the condition of large value of Δτ/Δσ,crack growth rate is decelerated during the early stage and the middle stage of crack growth. Based on the result of fractography, crack growth mechanisms under multiaxial loading condition are also discussed.

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© 2017 The Japan Society of Mechanical Engineers
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