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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.12 [2005] >
IJEMS Vol.12(4) [August 2005] >
| Title: | Effect of contact geometry on fretting fatigue life of aluminium alloy 2024-T3 |
| Authors: | Farrahi, G H
Majzoobi, G H
Chinekesh, H |
| Issue Date: | Aug-2005 |
| Publisher: | CSIR |
| IPC Code: | C21C21/00, C22F |
| Abstract: | The effect of
contact geometry on fretting fatigue life was investigated by experiments and
numerical simulation. The experiments were conducted for flat and cylindrical
pads under the same contact normal force. The post-test examinations including
crack growth measurements and fractography were carried out using optical and
scanning electron microscopy (SEM). Numerical simulations of pad-specimen
assembly with and without crack were performed using a finite element (FE)
analysis. The experimental study revealed that the rate of crack growth was
higher at the early stages of fretting fatigue for cylindrical pads. This stage
corresponds to a higher KII
for cylindrical contact model. After this stage, the effects of friction force
and KII decrease and the
effects of tensile stress and KI
become more significant. The experimental results also showed that fatigue life
of AA2024 reduced by nearly 75% under fretting fatigue condition. However, the
reduction for cylindrical contact geometry was more than that measured for flat
contact model. The numerical results indicated that the maximum shear, tensile,
and Von-Mises stresses which are thought to be the origin for initiation and
growth of crack, occur at the trailing edge of the contact surface for flat and
cylindrical pads. SEM examination confirmed that the crack initiated from the
points of stress maxima. |
| Page(s): | 331-336 |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.12(4) [August 2005]
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