| Citation: | SHA Yundong, HUANG Jingxuan, LUO Li, et al. Damage evolution and failure mechanism of composite turbine shaft structure[J]. Journal of Aerospace Power, 2024, 39（5）：20210572 doi: 10.13224/j.cnki.jasp.20210572
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For continuous fiber reinforced composites turbo-shaft structural damage evolution and failure mechanism analysis, based on the macro-mechanics and meso-mechanics analysis method of cross-scale, a finite element simulation model with the same size of the shaft structure verification model and a micro-mechanics representative volume element (RVE) model was established. The damage evolution of shaft structure was predicted and its failure mechanism was analyzed. Under reverse torque, the damage of [45]6 shaft structure structure began with interface cracking, the cracks were extended to both sides of titanium alloy, and the shear deformation of titanium alloy finally drove the fiber fracture. Under forward torque, the damage of [45]10 shaft structure began with matrix damage, titanium alloys on both sides of the fracture were pressed against each other, and finally the fiber was cut. The failure mode verification experiment of composite shaft structure was carried out, different failure modes in the failure process were identified by acoustic emission and scanning electron microscopy techniques. The simulation results were compared with experiment results to verify the validity of the model and method. The damage evolution process and failure mechanism of the turbo-shaft structure under torsional load were simulated and the failure strength was predicted. The damage evolution process and failure mechanism of turbo-shaft structure under torsional load were simulated and the failure strength was predicted. The results showed that the torsional strength was the lowest when the layer was laid at 0° and 90°, and the highest when the layer was laid at 45°, which increased nearly three times. The prediction model and analysis conclusions could provide a basis for the design and application of fiber reinforced composites.
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