Fatigue and fracture assessment of notched components by means of the Strain Energy Density

Brittle failure of components weakened by cracks or sharp and blunt V-notches is a topic of active and continuous research. It is attractive for all researchers who face the problem of fracture of materials under different loading conditions and deals with a large number of applications in different engineering fields, not only with the mechanical one. This topic is significant in all the cases where intrinsic defects of the material or geometrical discontinuities give rise to localised stress concentration which, in brittle materials, may generate a crack leading to catastrophic failure or to a shortening of the assessed structural life. Whereas cracks are viewed as unpleasant entities in most engineering materials, U- and V-notches of different acuities are sometimes deliberately introduced in design and manufacturing of structural components. Dealing with failure of notched components and summarising some recent experimental results reported in the literature, the main aim of the present contribution is to present a short review of the research work developed by Professor Paolo Lazzarin dealing with the Strain Energy Density approach. The approach, which is based on the volume Strain Energy Density (SED), has been recently applied to assess the failure of a large number of materials. The main features of the SED approach are outlined in the paper and its peculiarities and advantages accurately underlined. Some examples of applications are reported, as well.