Effects of Phase Difference Between Axial and Contact loads on Fretting Fatigue Behavior of Titanium Alloy.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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movement. It results in a reduction of the material life as compared to the plain fatigue. Most of the previous works were accomplished under a constant applied normal load and a little effort was done under a variable contact load, while none of these studies have considered the phase difference between the axial and the contact load. The primary goal of this study is to investigate the effect of phase difference between axial and contact loads on fretting fatigue behavior of Ti-6Al-4V. The frequency of both axial and contact loads was the same .i.e. 10 Hz. Under variable contact load condition only the axial stress range and the phase angle were varied. Cracks were always found to initiate on the contact surface and near the trailing edge for all tests. The software program, ABAQUAS, was used in finite element analysis to determine the contact region state variables such as stress, strain, and displacement. The fatigue parameters such as the stress range, effective stress, and modified shear stress range MSSR were analyzed to predict the fatigue life. The fatigue life with in-phase variable contact load was almost same as that of constant contact load. The out of phase condition was found to increase the fatigue life from 20 to 30 in the low cycle regime and up to 150 in the high cycle regime relative to its counterpart from in-phase loading. The MSSR parameter was effective in predicting the fatigue life, crack initiation location, and crack initiation orientation.
- Metallurgy and Metallography
- Properties of Metals and Alloys