Abstract
The spread of a yield zone ahead of a notch root is analyzed under a plane stress, plane strain and axisymmetric condition by finite element method (FEM). A model for predicting the yield zone size is devised by utilizing Dugdale Model and proposed newly as Notch Root Yield Zone Model. The model explains very well the relationship between the maximum yield zone size ahead of the notch root and the sectional average of Mises Equivalent Stress, which are obtained by FEM analyses. The notch size effect is considered based on the model proposed and is formulated with support of a Notch Behavior Map from two viewpoints; (1) Replacement of the notch root with a plain surface, and (2) Replacement of the notch root with a crack tip.
