Abstract
Tension-torsion high-cycle fatigue experiments with solid cylindrical bar specimens of 30CrMnSiA steel were carried out under different phase angles. And the experiment data, characteristics of stresses with plane orientation and fracture appearance under different loading conditions were analyzed and investigated. Experiment results show that fatigue life increases gradually with the increase of phase angle. The fatigue life is shortest for 0° phase angle, while the fatigue life is longest for 90° out-of-phase angle. It could be found from analysis of stress parameters that as the phase angle increases, the shear stress amplitude decreases and the maximum normal stress increases gradually, which are on the maximum shear stress amplitude plane close to the axial of specimen. Macro-analysis of the fracture appearances show that when the phase angle increases, the angel between crack initiation plane and specimen axial decreases, and cracks are inclined to initial and propagate on or near the maximum shear stress amplitude plane with larger maximum normal stress under proportional loading as well as non-proportional loading.
Highlights
IntroductionFor the influence of phase difference on fatigue failure, McDiarmid [1,2] analysed the stress characteristics of different load cases and assumed that the existence of a phase angle will have a positive effect on the fatigue failure
30CrMnSiA steel is a kind of quenched and tempered steel with the advantages of high strength and fatigue resistance that widely used in aircraft, such as the landing gear, engine mount and important bolt structure and components
It could be found from analysis of stress parameters that as the phase angle increases, the shear stress amplitude decreases and the maximum normal stress increases gradually, which are on the maximum shear stress amplitude plane close to the axial of specimen
Summary
For the influence of phase difference on fatigue failure, McDiarmid [1,2] analysed the stress characteristics of different load cases and assumed that the existence of a phase angle will have a positive effect on the fatigue failure. Susmel [5,6] thought that the existence of phase has a negative effect on the fatigue failure of ductile metals. Anes [8] found that the existence of a phase angle has a negative effect on multiaxial fatigue failure of 42CrMo4 steel and AZ31B-F Mg alloy. Shi [9] found that the existence of a phase angle has a positive effect on the fatigue life of 2A12-T4 aluminum alloy under tension-torsion fatigue loading
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