Abstract
The prediction of the stress distribution plays a key role when replacing conventional metallic components with ceramic matrix composites (CMCs) ones in the turbine engine. Furthermore, the complete thermal-mechanical properties of a CMCs component cannot be obtained through experimentation. Accordingly, a numerical method to calculate the thermal-mechanical properties of a CMCs component should be established. In this work, a 3D finite element model of CMCs turbine vane was applied. Then, the stresses due to thermal and pressure loads were simulated. Based on the simulation results, the maximum thermal residual stresses are about 40MPa and occur at the surface of the vane. It can be concluded that the thermal residual stresses should not be neglected for the studied CMCs turbine vane. The load cases have significant effects on the stress distributions. The maximum spanwise stress reached the level of 300MPa and it was larger than the hoop stress and through thickness stress. The locations of maximum and minimum stresses also vary with load cases.
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