Modeling the Fatigue Wear of the Cylinder Liner in Internal Combustion Engines during the Break-In Period and Its Impact on Piston Ring Lubrication
Name
lubricants-07-00089.pdf
Description
Published version
Size
4.74 MB
Format
Adobe PDF
Checksum (MD5)
3c4d22a81e3c5f7e5e0d196d24b6cc2f
Author(s)
Gu, Chongjie
Wang, Renze
Tian, Tian
Date Issued
October 2019
Journal
Lubricants
Publisher
MDPI AG
Citation
Gu, C.; Wang, R.; Tian, T. Modeling the Fatigue Wear of the Cylinder Liner in Internal Combustion Engines during the Break-In Period and Its Impact on Piston Ring Lubrication. Lubricants 2019, 7, 89. © 2019 The Author(s)
Version
Final published version
Abstract
In internal combustion engines, a significant portion of the total fuel energy is consumed to overcome the mechanical friction between the cylinder liner and the piston rings. The engine work loss through friction gradually reduces during the engine break-in period, as the result of liner surface topography changes caused by wear. This work is the first step toward the development of a physics-based liner wear model to predict the evolution of liner roughness and ring pack lubrication during the break-in period. Two major mechanisms are involved in the wear model: plastic deformation and asperity fatigue. The two mechanisms are simulated through a set of submodels, including elastoplastic asperity contact, crack initiation, and crack propagation within the contact stress field. Compared to experimental measurements, the calculated friction evolution of different liner surface finishes during break-in exhibits the same trend and a comparable magnitude. Moreover, the simulation results indicate that the liner wear rate or duration of break-in depends greatly on the roughness, which may provide guidance for surface roughness design and manufacturing processes. Keyword: Liner wear; Friction; Surface roughness; Internal combustion engine
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.3390/lubricants7100089
