MODEL OF STEADY ROLLING-CONTACT BETWEEN LAYERED ROLLS WITH THIN MEDIAIN THE NIP

A finite element model of large deformation, plane strain rolling cont act between rubber-coated rolls with thin media in the nip is develope d. The rubber layers on each roll are modeled as incompressible, hyper elastic materials using a Neo-Hookean model. Steady rolling contact is analyzed using a standard Lagrangian finite element code with a modif ied friction algorithm which converts the code from a Lagrangian frame work to an Eulerian framework. The case of a rigid roll against a laye red roll is presented. It is shown how this analysis can be easily ext ended to the case of two layered rolls with thin media in the nip if t he thin media has a much higher elastic modulus than the layers. Simpl e static indentation models are shown to provide useful information re garding the steady rolling case. Numerical results illustrate the effe ct of indentation, nominal speed ratio and paper velocity on the veloc ity and traction distributions in the nip.