A USER-FRIENDLY THEORY OF ORTHOTROPIC PLASTICITY IN SHEET METALS

The aim is to model some basic aspects of the yielding and plastic flow of textured sheet, especially a specific combination of properties which is relatively common but not covered by existing theories. In constructing a new yield criterion the over-riding considerations here are flexibility and manipulative convenience. The numerical parameters are kept to a minimum and must be determinable readily from data given by standard tests. It is shown that these requirements are met by adding a particular pair of cubic terms to the author's 1948 quadratic.