Assessment of Fatigue Life Behaviour of Cylinder Block for Free Piston Engine Using Frequency Response Approach

摘要

This study presents the finite element analysis technique to predict the fatigue life using narrow band frequency response approach. The life prediction results are worthy for improving the component design at the very early developing stage. This approach is adequate for periodic loading, however, requires very large time records to accurately describe random loading processes. This study describes how this technique can be implemented in the finite element environment to rapidly identify the critical areas of the structure. Fatigue damage in conventionally determined from time signals of the loading, frequently in the form of stress and strain. However, there are scenarios when a spectral form of loading is more appropriate. In this case the loading is defined in terms of its magnitude at different frequencies in the form of a Power Spectral Density (PSD) plot. The vibration fatigue calculation can be utilized where the random loading and response are categorized using power spectral density functions and the dynamic structure is modeled as a linear transfer function. This study also investigates the effect of the mean stress on the fatigue life prediction using the random loading. The acquired results indicate that the Goodman mean stress correction method gives the most conservative results with the Gerber and no (zero) mean stress method. The proposed technique is capable of determining premature products failure phenomena. Therefore, it can be reduce cost, time to market, improve the product reliability and finally the user confidence.