Temperature Effect on Acoustic Fatigue Life Analysis of Honeycomb Sandwich Structures Based on Power Spectral Density

In order to research the influence of acoustic loads and temperature on the life of the engine acoustic lining, a 1/36 simplified model of a cylindrical honeycomb structure is established by using Patran & Nastran software’s MPC function. Firstly, the solution process of the temperature field has been calculated. Secondly, with acoustic PSD as input load, the frequency response and random response analyses are conducted which can output the stress PSD of the dangerous point under different temperatures. Thirdly, we use Matlab programming to calculate the fatigue life of structure. The Matlab programming is established based on P-M linear cumulative damage theory and Dirlik formula. The results show that with the growth of the acoustic load or temperature, the acoustic life of structure will be reduced.