Abstract
Cyclic strain produces slip irregularities in the form of depressions and elevations on the surface of metals, often referred to as persistent slip bands, then surface slip irregularities grow as the number of cycles increases and result in roughening the surface. The surface roughening continues until the heights and depths of the extrusions and intrusions reach to a critical level leading to the initiation of a micro-crack. This study reports the implementation of a technique to increase the fatigue life of metals by polishing the specimens during cyclic loading. The critical values for the extrusions and intrusions are shown to be 4.8–5 μm and 5–5.5 μm, respectively. The results of an extensive set of experiments reveal that fatigue life can be extended significantly (from 45% to 100%) by polishing the surfaces at appropriate intervals. Results are also presented for determining an effective polishing period to substantially increase fatigue life performance.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
