In the present work the lateral defect is modeled with fillet welds using the local approach combined with the finite elements method. In this case the design parameter is the local stress or strain instead of the nominal stress. Through this approach is possible to consider the possibility of constructing and using only one curve of design or ' key curve ', for a given material. These spots are located in the geometric discontinuities of the joint. The so called ' local approach ' is based on the concept that the fatigue strenght of welded joints is essentially determined by the local stress and strain in the ' hot spots '. From the point of view of the user, it is often difficult to establish accurately which is the curve that better fits the design that is being considered. This implies the construction of a curve for each particular design. When welded joints have to meet particular requirements related to fatigue life they are usually designed using the so called S-N design curves.

Mirc crack 7.43