Fracture Mechanics-Based Acceptance Criteria of CVC Rolls of Hot Strip Mill

摘要

The present work began by investigating the global force distribution and inter-roll contact force distribution in CVC rolls of a compact hot strip mill with the advanced flat rolling simulation model developed by Quad Engineering. The stress fields with in the work roll and backup roll were calculated using commercial FEA software for the force distributions predicted by the Quad model. Deformation Control Technologies predicted the residual stress patterns imparted by roll manufacturing, which were then superimposed onto the mechanical model to generate combined stress fields within the rolls. Fracture mechanics principles were applied to calculate the stress intensity factors associated with a hypothetical flaw in order to quantify fatigue stress response. Finally, the tolerable design flaw size criteria were mapped through the cross section of the roils bused on the calculated stress intensity distribution, incorporating the influence of a typical embedded flaw shape. Results facilitate development of specifications and inspection criteria for CVC rolls operating under real loading conditions.