A SIMPLE MODEL FOR THE EVALUATION OF FATIGUE DEGRADATION LAWS FOR INTERFACE ELEMENTS

摘要

A simple model that represents interface elements subjected to fatigue loading is proposed and used to evaluate three different constitutive laws as well as three different damage definitions. The three constitutive laws are bilinear, third-order polynomial and linear-polynomial while the damage definitions are based on the degradation of stiffness and the energy consumed. The behaviour of the constitutive laws and damage formulations has been found to be similar but with some variations in their sensitivity to the size of the elements and to the number of cycles applied in each load step. The results confirm that the more accurate results are found for smaller values of these two variables.