Analytical Study on Longitudinal Buckling Deformation Behavior of Wide-width and Thin-size Hot Rolled Strip

doi:10.3901/JME.2022.14.203

Abstract

Abstract: For the complete set of shape control technologies for wide hot rolled strip, the perfect strip buckling generation mechanism is a necessary prerequisite for the establishment of high-precision shape control model, and also an important basis for the study of shape quality improvement. In this paper, aiming at the wave shape problem in the production of ultra-thin wide hot rolled strip, the common longitudinal buckling deformation behavior in hot rolling is studied. A unified form of high-order trigonometric function is established to describe the complex and changeable longitudinal buckling stress field and wave shape bending mode of strip. At the same time, the local coefficient is innovatively introduced to describe the full width and local longitudinal buckling wave shape, which can fully characterize the bending mode of longitudinal buckling wave shape. According to the energy principle of the small deflection theory of elastic thin plate, the longitudinal buckling mechanical model is established, and the critical buckling stress expression of the longitudinal buckling of hot rolled strip is obtained. At the same time, the ABAQUS finite element software is used to simulate the longitudinal buckling deformation behavior, and the correctness of the analytical model is verified. Finally, combined with the high temperature characteristics of hot rolled strip, the influence of multiple factors such as uneven distribution of temperature field, tensile stress and local coefficient on the critical buckling is considered and analyzed. The analytical model further reveals the formation mechanism of high order shape of hot rolled strip, and can quickly obtain the critical buckling stress of different longitudinal buckling waves, which provides theoretical and data basis for shape control of wide and thin hot rolled strip, and can be applied to online shape control system of hot rolled strip.

Key words: hot-rolled strips, longitudinal buckling, strip wave shape, critical stress

CLC Number:

TG156

SUN Wenquan, HE Anrui, LIU Chao, XU Rishi, YUAN Tieheng. Analytical Study on Longitudinal Buckling Deformation Behavior of Wide-width and Thin-size Hot Rolled Strip[J]. Journal of Mechanical Engineering, 2022, 58(14): 203-211.

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