Experimental and simulation analysis in edge cracking for cold rolled thin strip
Edge cracks in rolled metal products occur occasionally, which influence the rolled strip properties and productivity significantly. Previous studies have indicated that the crack initiation at high plastic strain amplitude mainly occurs at the grain boundaries and stress concentration zone. The mechanics of crack propagation is still not fully identified, especially in the cold rolled thin strip. In this research, experimental investigation and associated analysis have been conducted on the edge crack evolution for thin strip in cold rolling. Three-dimensional finite element numerical simulations have been conducted to assist in better understanding of crack propagation at the rolled strip edge. The impacts of the reduction and the friction coefficients on crack propagation are analysed. Simulation result shows that the thickness reduction and friction influence significantly the propagation of edge cracks. The optimum rolling schedule to obtain crack-free products in metal forming of thin strip is discussed.