Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/81680
Title: Evolution of Diffusion-Related Degradation of Polymeric Lubricant Under Laser Heating: A Molecular Dynamics Study
Authors: Li, Bei
Wong, Chee How
Chen, Qiu Bo
Keywords: Degradation
Diffusion process
Issue Date: 2013
Source: Li, B., Wong, C. H., & Chen, Q. B. (2014). Evolution of Diffusion-Related Degradation of Polymeric Lubricant Under Laser Heating: A Molecular Dynamics Study. IEEE Transactions on Magnetics, 50(4), 3301409-.
Series/Report no.: IEEE Transactions on Magnetics
Abstract: Molecular dynamics simulation coupled with a modified coarse-grained bead-spring model is employed to investigate the diffusion-related degradation of lubricant film under laser heating. The lubricant surface morphology and depletion profiles during laser heating are studied. It is observed that lubricant film degrades due to thermal diffusion and undergoes severe depletion with increasing laser heating duration, resulting in raised ridges around the depleted zone. The diffusion width and depth are evaluated to further explore diffusion-related degradation instability. As expected, the diffusion depth increases rapidly with the heating duration and the laser power, while the width would fluctuate around a constant value after initial rapid rise and following slight reduction. In addition, a Gaussian temperature gradient is formed in the radial direction due to the thermal transfer between the heated and surrounding beads. It is also shown that the laser power plays an important role in the temperature gradient and hence greatly influences the diffusion-related degradation of lubricant film on a solid surface.
URI: https://hdl.handle.net/10356/81680
http://hdl.handle.net/10220/40927
ISSN: 0018-9464
DOI: 10.1109/TMAG.2013.2291217
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 2013 IEEE.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MAE Journal Articles

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