Mean stress sensitivity and crack initiation mechanisms of spring steel for torsional and axial VHCF loading
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- 作者：Herwig Mayera ; herwig.mayer@boku.ac.at" class="auth_mail" title="E-mail the corresponding author ; Reinhard Schullera ; Ulrike Karra ; Michael Fitzkaa ; Daniel Irrascha ; Malte Hahnb ; Manfred Bacher-Hö ; chstb
- 关键词：Cyclic torsion ; Cyclic tension ; Load ratio ; VDSiCr spring steel ; Very high cycle fatigue
- 刊名：International Journal of Fatigue
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：93
- 期：part_P2
- 页码：309-317
- 全文大小：2754 K
文摘
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Pronounced mean stress sensitivity of VHCF torsional and axial strength is found.
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Cracks in cyclic torsion mostly initiate by cyclic shear without a crack starter.
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Cracks in cyclic tension mostly start at internal inclusions or grain boundaries.
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Initial shear cracks deflect to mode I at a well-defined stress intensity factor.
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Residual stresses are stable under axial but not under torsional VHCF loading.