Growth of Ring-shaped Edge Cracks under Reversed Torsional Fatigue

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概要

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• Mode III fatigue crack growth was studied using cylindrical specimens with ring-shaped edge cracks under reversed torsion. Cracks grew locally in Mode I making small branches but their macroscopic growth direction was perpendicular to the specimen axis. The crack depth was successively estimated by the compliance calibration method and the growth rate of torsional cracks was related to the applied stress intensity factor range ΔK_<III>. In torsion, friction must be considered together with mutual sliding of pre-fatigue crack surfaces. Consequently, the applied torsional torque should be modified in evaluating the effective stress intensity factor. Effect of the surface friction on the stress state around the crack tip was examined by an elastic-plastic finite element analysis.

• 一般社団法人日本機械学会の論文

著者

• Imai Yasufumi

  Department Of Mechanical Engineering Nagasaki University

• Imai Yasufumi

  Department Mechnical Engineering Nagasaki University

• Matake Tomokazu

  Department Of Mechanical Engineering Nagasaki University

• TAKASE Tooru

  Department of Mechanical Engineering, Nagasaki University

• Takase Tooru

  Department Of Mechanical Engineering Nagasaki University

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• Growth of Ring-shaped Edge Cracks under Reversed Torsional Fatigue

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