Local approaches for design against fracture and fatigue
The first part of the course will be a brief introduction to fracture and notch mechanics. Starting from a deep historical overview the concepts of elastic stress intensity factor, Griffith energy, J integral will be introduced. Attention will be given to the experimental determination of the fracture toughness and of the threshold stress intensity factor range under cyclic loading. Emphasis will be placed on modern numerical methods for determination of stress intensity factors, critical crack sizes and fatigue crack propagation rate. Some aspects related to three-dimensional effects will be discussed.
The second part of the course will treat notch mechanics in more detail presenting different advanced local criteria for fracture and fatigue assessment under static and fatigue loadings. Starting from traditional solutions the course will give a complete overview of the analytical and numerical tools available up to now also discussing some practical example of engineering interest.