Análise da fadiga em materiais heterogêneos utilizando a peridinâmica

Abstract

It is known that the vast majority of the mechanical components currently used are subjected to cyclic stresses and strains and, therefore, can suffer degradation or even failure due to a phenomenon called fatigue. Fatigue is characterized by the unexpected collapse of the material, and in materials with heterogeneous characteristics this problem can be maximized due to the inherent heterogeneity of the material, so its study is necessary. The classic experimental study of fatigue uses several considerations to present a reliable fatigue life result, but numerical simulations have become an increasingly used tool to help predict the fatigue life of components. In view of this, in the present work peridynamics is used to simulate the phenomenon of fatigue, taking advantage of the characteristic of randomness to reach estimates of fatigue life and failure in heterogeneous materials. In this work, examples of components with pre-existing cracks will be used to study their propagation, respecting the original formulations of the tools that peridynamics provides to estimate fatigue life according to the Paris law. Among the results that prove the effectiveness of peridynamics as a tool for the study of fatigue life, the different stress levels applied to the flat plate provided different values of fatigue life, the curve obtained by the Paris Law follows the expected pattern. by theory and the parameter that caused the greatest variation in the fatigue life of the flat plate was the coefficient of variation (CV) which is linked to the heterogeneity of the material. Keywords: Fatigue, peridynamics, Paris law.