Analysis of friction and surface roughness effects on edge crack evolution of thin strip during cold rolling

Experimental investigation and mechanical analysis have been carried out to study the edge crack formation during cold strip rolling using Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). The effects of friction and surface roughness on edge crack initiation and growth rate have...

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Bibliographic Details
Published in:Tribology international 2011-08, Vol.44 (9), p.971-979
Main Authors: Xie, H.B., Jiang, Z.Y., Yuen, W.Y.D.
Format: Article
Language:English
Subjects:
Applied sciences
Crack initiation
Crack propagation
Exact sciences and technology
Forming
Fracture mechanics (crack, fatigue, damage...)
Friction
Friction, wear, lubrication
Fundamental areas of phenomenology (including applications)
Machine components
Mechanical engineering. Machine design
Metals. Metallurgy
Physics
Production techniques
Rolling
Solid mechanics
Structural and continuum mechanics
Surface roughness
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Summary:Experimental investigation and mechanical analysis have been carried out to study the edge crack formation during cold strip rolling using Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). The effects of friction and surface roughness on edge crack initiation and growth rate have been discussed. Friction leads to an increase in fracture loads and decreasing the friction coefficient is effective in preventing the microcracks. Surface roughness variation along the strip width contributes to stress distribution and inhibits crack nucleation. The findings reveal that the behaviour of crack evolution is influenced by fracture surface roughness as well as rolling friction. ► Decreasing the friction coefficient is effective in preventing microcracks. ► AFM and SEM observations confirm that edge crack is initiated from porosity and roughness grooves. ► Rougher surfaces show higher stress concentration coefficient than smoother surfaces. ► Lubrication reduces the frictional stress, and crack initiation is delayed for finer surfaces.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2011.03.029