Metodika praktické analýzy vlivu vrubu na únavovou životnost pro použití na základě výsledků MKP analýzy

Abstract

In Master thesis is analysed the influence of structural notch on fatigue of lifetime. A main attention is dedicated to prediction of lifetime on basic of FEM analysis. In introduction of this thesis is analysed the influence of maximum peak stress and stress gradient on selected material. It is on basic of results of experimental test of NACA. The analysis shows that for prediction of fatigue lifetime is necessary precise determination of maximum peak stress and stress gradient. The next part of this thesis deals with analysis of joint of skin and stringer, and with creation FEM model of these joint. There are designed four methods of creation FEM model and then is selected the best one. This method is tested on panel of wing of aircraft EV-55 Outback. By comparing prediction crack initiation lifetime and crack initiation lifetime of fatigue test is arrived at satisfactory compliance.