Fracture Mechanics Theoretical Modelling And FEM Analysis Of 3 Point Bending Specimen

Fracture mechanics, as we all know, are closely related to our daily life. There are a lot of the disasters due to fracture, fatigue, or fraction. Even in the modern society, failure due to fracture, fatigue and fracture is going on all the time, because the theory in this field is not well established. Doing research in this field requires solid background in Mathematics together with knowledge in Solid Mechanics and Mechanical Engineering. Nowadays, however, more and more researchers are working in this field. These researches will give the better understanding with the materials and also the structure. It will be definitely a promising field in the future.In order to do research for the the cushion spring from the Electromagnetic Exciter, a 3 Point-Bend Specimen (3PBS) has been chosen. The analyses will be carried on this specimen with different loading conditions. Failure will occur due to fracture or fatigue in the spring. Cyclic load are chosen as candidates for analysis in this paper.In this dissertation, the following parts will be carried on:theoretical modelling for the 3PBS, the principal of material selection, analytical analysis for Dynamic Stress Intensity Factor, FEM analysis in ABQUS and discussion with the results. The Stress Intensity Factor (SIF) for different loading cases will be compared. The life time of the specimen in our model has also been evaluated. Further, some mathematical method for finding Dynamic Stress Intensity Factor (DSIF) will be discussed in this dissertation. The research for DSIF will be continued in future.This dissertation will provide the general idea how to do the fracture mechanics analysis in a standard way for the cushion spring from the Electromagnetic Exciter. It can form the solid basis for deeper research in future.