Pressure impulse test simulation of 7075-T7451 aluminium alloy shell with reliability and confidence levels

The electro-hydraulic system is inevitably subject the pressure impulse during operation. Therefore, performing fatigue analysis for the structure of hydraulic components is essential. The fatigue data of 7050-T7451 aluminium alloy are processed by the grouping method and two different one-sided tolerance factor methods to get the S-N curves with high reliability and confidence levels. It is shown that the fatigue life from the one-sided method is the smallest, followed by the new one-sided method in the same stress level. Then the procedure of pressure impulse simulation by Ansys Workbench is introduced. And the processed S-N curves are introduced into the pressure impulse simulation of an electro-hydraulic servo valve shell to evaluate three different processing methods.