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research-article

A NOVEL PRINCIPAL STRESS-BASED MODEL FOR MULTI-AXIAL FATIGUE OF PRELOADED THREADED FASTENERS

[+] Author and Article Information
Amir Kazemi

Ph.D. Student, 2721 Patrick Henry St., Apt 512, Auburn Hills, MI, 48326, USA
akazemi@oakland.edu

Sayed Nassar

Distinguished University Professor, Room 348 Engineering Center (EC), Oakland University, Rochester, Michigan 48309, USA
nassar@Oakland.edu

1Corresponding author.

ASME doi:10.1115/1.4039124 History: Received August 20, 2017; Revised December 04, 2017

Abstract

A novel principal stress-based high cycle fatigue (HCF) model is proposed for preloaded threaded fasteners under cyclic tensile-shear loads. The model uses the fastener principal stress amplitude in order to construct a singular multiaxial S-N curve from the conventional uniaxial S-N curve with zero mean stress of bolt along with some experimental data. An MTS fatigue testing system is used first to generate the fastener preload by applying a direct tensile-shear load using a special fixture. Subsequently, the same system is used for applying combined cyclic tensile-shear loading of the fastener at various levels of mean stress. Results show that for the same level of axial stresses, the multiaxial loading would significantly reduce bolt fatigue life as compared to that of uniaxially-loaded bolt. Moreover, only one S-N curve would be able to predict the multiaxial high cycle fatigue of preloaded threaded fasteners, when the maximum principal stress amplitude is used. Detailed discussion of the proposed model results and test data are provided.

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