This paper describes the development of a model for predicting the elastic deformations and stresses in a web crossing a concave (or negative crown) roller. The Finite Element Method was used to compute web displacements, forces and stresses. A preprocessor was developed to automatically convert the web material properties and roller geometry into a FEM mesh and a set of boundary conditions. The boundary conditions which produce web spreading were developed and incorporated into the model. The principal boundary conditions in this model are derived from the assumption that there is sufficient friction between the web and the roller to prevent slipping. Because of the nonlinear nature of the traction between the web and the roller, an iterative Finite Element solution technique was used. The model was used to perform a study of the effects of variations in geometry, material properties and operating conditions on the spreading behavior of the web/roller system. The results of this study are presented.Mechanical and Aerospace Engineerin
