Thermomechanical modeling and transient analysis of sliding contacts between an elastic–plastic asperity and a rigid isothermal flat. (January 2015)

• Record Type: Journal Article
• Authors: Shi, Xi; Wu, Aizhong; Jin, Chuan; Qu, Shaoxing
• Is Part Of: Tribology international. Volume 81(2015)
• Page Start: 53
• Page End: 60
• Publication Date: 2015-01
• Subjects: Thermomechanical contact -- Frictional heat -- Slip weakening; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2014.08.004
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: To investigate thermomechanical contacts between an elastic–plastic sphere and a rigid flat, simulations with slip rates ranging from 0.1 m/s to 10 m/s were performed. As interfaces with strong interfacial bonding but weak substrate were specifically targeted, slip initiation was treated as shear failure of the softer material in numerical simulations. The simulations show that both sliding friction coefficient and friction stress are significantly dependent on slip rate while the maximum static friction coefficient is independent of that. Moreover, the energy release during the transition from full stick to full slip is comparable to the shear fracture energy of the material. Highlights: The higher slip rate results in higher contact temperature and lower friction. The maximum friction occurs at the same tangential displacement. The maximum static friction coefficient is independent of the slip rates. The energy release during presliding is comparable to the shear fracture energy.