Mechanical-Probabilistic Model of Composite Patch-Repaired Aluminum Plates Under Cyclic Loading

摘要

This paper presents a probabilistic analysis approach applied to finite element analysis for modeling a cracked aluminum plate repaired with composite patches under cyclic loading. For this, it is necessary to have a mechanical model and a probabilistic model correctly representing the behavior of this type of structures. The finite element method reported in this paper to analyse the evolution of the stress intensity factor and to evaluate the effect of the composite patch on increasing the life of cracked structures. The uncertainty of the geometric characteristics and mechanical properties of the Glass/Epoxy repair patch was presented in this study. The Probabilistic method applied to finite element modeling provides another alternative medium for structural analysis of repairing aluminum plates to achieve a robust and reliable design in a more efficient manner. The Monte Carlo simulation was used in this study and the reliability in this context is defined as the probability that the stress intensity factor is less than the toughness under cyclic stress. According to this study, the most influential parameter that has a significant effect on the stress intensity factor is the thickness of the adhesive and the thickness of the patch that must be tightly controlled.