A principal stress-based high cycle fatigue (HCF) model is proposed for cyclic multiaxial stresses in threaded fasteners under tensile-shear loading. The proposed model uses the fastener principle stress amplitude in order to construct mean-stress adjusted S-N curves for multi-axial stresses. Experimental validation is provided using an MTS fatigue testing system, with a special fixture that would allow combined cyclic tensile-shear loading of the fastener at various angles relative to the axis of the MTS grip axis. Experimentally validated multiaxial fatigue model is compared to classical uniaxial S-N curves. Detailed discussion of the model results is provided.
Principal Stress Model for Multi-Axial Fatigue of Preloaded Threaded Fasteners
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Kazemi, A, Nassar, SA, & Wu, Z. "Principal Stress Model for Multi-Axial Fatigue of Preloaded Threaded Fasteners." Proceedings of the ASME 2016 International Mechanical Engineering Congress and Exposition. Volume 2: Advanced Manufacturing. Phoenix, Arizona, USA. November 11–17, 2016. V002T02A078. ASME. https://doi.org/10.1115/IMECE2016-66266
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