Experimental and numerical modeling of flatness defects in strip cold rolling

Abstract The manufacturing of sheets with high mechanical yield stress, low thickness and minimal flatness defects is a major challenge in the cold rolling of aluminum alloys or steels. Compressive residual stress may appear due to the manufacturing process and induce elastic wave buckling, leading to flatness defects. This study proposes an experimental setup to analyze the interaction between residual stress and buckling for wavy edge flatness defects. The residual stress is simulated by thermal stress. High-resolution full-field measurements are used to measure the wrinkling shape and thermal field. The influence of surface imperfections and global tension on the wrinkling characteristics is highlighted. Finite element tests are used for test validation.

[1]  S. Abdelkhalek,et al.  Coupled and uncoupled approaches for thin cold rolled strip buckling prediction , 2009 .

[2]  Y Zhao,et al.  Techniques for buckling experiments on steel silo transition junctions , 2001 .

[3]  M. A. Souza,et al.  Review of Experimental Techniques for Thin-walled Structures Liable to Buckling , 1983 .

[4]  Rui Huang,et al.  Stretch-induced wrinkling of polyethylene thin sheets: Experiments and modeling , 2014 .

[5]  Pierre Montmitonnet,et al.  Coupled approach for flatness prediction in cold rolling of thin strip , 2011 .

[6]  T. R. Tauchert,et al.  Thermally Induced Flexure, Buckling, and Vibration of Plates , 1991 .

[7]  Ben Young,et al.  Behavior of High Strength Structural Steel at Elevated Temperatures , 2006 .

[8]  Franz G. Rammerstorfer,et al.  A Study on the Buckling Behaviour of Strips and Plates with Residual Stresses , 2005 .

[9]  N. Goo,et al.  A study of the thermal buckling behavior of a circular aluminum plate using the digital image correlation technique and finite element analysis , 2014 .

[10]  W. Wieser,et al.  Buckling phenomena related to rolling and levelling of sheet metal , 2000 .

[11]  Franz G. Rammerstorfer,et al.  Residual Stress-Induced Center Wave Buckling of Rolled Strip Metal , 2003 .

[12]  W. F. Ranson,et al.  Applications of digital-image-correlation techniques to experimental mechanics , 1985 .

[13]  Luc Schueremans,et al.  Measuring the thermal expansion coefficient of tubular steel specimens with digital image correlation techniques , 2010 .

[14]  Michel Potier-Ferry,et al.  Influence of local wrinkling on membrane behaviour: A new approach by the technique of slowly variable Fourier coefficients , 2010 .

[15]  Pierre Montmitonnet,et al.  Hot and cold strip rolling processes , 2006 .

[16]  Franz G. Rammerstorfer,et al.  Buckling of Free Infinite Strips Under Residual Stresses and Global Tension , 2001 .

[17]  Fumio Fujii,et al.  Path-tracing analysis for post-buckling process of elastic cylindrical shells under axial compression , 2012 .

[18]  Pierre Montmitonnet,et al.  Manifested flatness defect prediction in cold rolling of thin strips , 2014, International Journal of Material Forming.

[19]  Earl A. Thornton,et al.  Thermal Buckling of Plates and Shells , 1993 .

[20]  A. Hacquin,et al.  A steady state thermo-elastoviscoplastic finite element model of rolling with coupled thermo-elastic roll deformation , 1996 .

[21]  M. A. Sutton,et al.  Accurate measurement of three-dimensional deformations in deformable and rigid bodies using computer vision , 1993 .

[22]  Cwj Cees Oomens,et al.  The Wrinkling of Thin Membranes: Part I—Theory , 1987 .