A NONLINEAR WOUND ROLL MODEL ALLOWING FOR LARGE-DEFORMATION

A new model is developed for predicting the internal loads in a wound roll. The principal contribution is the ability to account for large d eformation. This is important for applications that require tightly pa cked rolls with large interlayer pressure and web compression. A nonli near, orthotropic, plane-strain, pseudoelastic constitutive law is use d. Arguments are made as to why the ''material symmetry condition'' do es not apply to the wound roll. An efficient numerical solution scheme is developed, and a good correlation is achieved with interlayer pres sure measurements available in the literature.