On the removal of extrusions and intrusions via repolishing to improve metal fatigue life
Document Type
Article
Publication Date
10-1-2019
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.
Publication Source (Journal or Book title)
Theoretical and Applied Fracture Mechanics
Recommended Citation
Haghshenas, A., & Khonsari, M. (2019). On the removal of extrusions and intrusions via repolishing to improve metal fatigue life. Theoretical and Applied Fracture Mechanics, 103 https://doi.org/10.1016/j.tafmec.2019.102248