Author(s)

J. Toribio

Abstract

This paper presents a combined micro- and macro-approach to the fracture of high-strength pearlitic steel bars subjected to multiaxial stress states produced by notches of very different geometries. A fracture criterion based on the distortional part of the strain energy density (or, accordingly, the equivalent stress in the von Mises sense) averaged over a critical distance characteristic of the microstructure of the material is developed towards a more physically sound criterion on the basis of the process zone concept, i.e., the critical domain or fracture region is not constant, but depends on the stress triaxiality in the notched geometry under consideration. Although this combined approach is more difficult due to microstructural considerations, it may also be impl

Keywords