Fatigue Analysis of Materials and Structures using a Continuum Damage Model

摘要

A fatigue model based in continuum mechanics accounting for elasto-plastic-damage constitutive equations, previously developed by the authors, has been extended to include the influence of material internal defects. In this stress life approach the material is considered to be non-homogenous. The material strength is randomly assigned and Stress-N° of cycles curves are scaled down according to material strength of each point. Limit values for material strength are based on experimental tests of samples with different degree of porosity. Preliminary results from the application of the formulation presented to the analysis of an aluminium industrial component, indicate that the approach is adequate for the fatigue analysis of metallic structures with scattered porosity and/or other internal defects.