Analysis on buckling deformation of hot rolled strip under multivariable coupling
The establishment of a high precision strip shape control model for the longitudinal buckling phenomenon in the hot rolling process poses a challenging problem.Therefore,the perfect buckling mechanism of strip is the nec-essary condition for the establishment of high-precision profile control model,and is also an important basis for the study of profile quality improvement.The present study presents a comprehensive analytical modeling investigation on the longitudinal buckling deformation of hot rolled strip.Firstly,to facilitate subsequent modeling calculations,a high-order polynomial is employed to describe the longitudinal stress field and complex buckling modes along the strip based on different buckling behaviors.Subsequently,by combining the small deflection theory of elastic thin plates with the principle of energy standing value,a comprehensive buckling model for strip is established using the obtained polynomial representation of longitudinal stress field and buckling mode.Simultaneously,to enhance the accuracy and applicability of critical buckling calculation in hot rolled strip production,an innovative approach incor-porating three-dimensional transient temperature field is introduced.Furthermore,ANSYS finite element software is employed to simulate longitudinal buckling deformation behavior and assess the discrepancy between finite element and analytical calculations for validation purposes.Finally,the influence of various factors such as non-uniform tem-perature distribution,tensile stress,and strip geometry on critical buckling is comprehensively analyzed.The pro-posed analytical model elucidates the underlying mechanism of flatness defects(buckling deformation)in hot-rolled strip production under the influence of multi-variable coupling.This model enables rapid determination of accurate critical buckling stress for different buckling wave shapes,thereby providing a solid theoretical and empirical founda-tion for shape control in hot rolled strip production.
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