高温复合材料舵面研制与试验验证

设计了一种蒙皮骨架结构高温复合材料舵面,并采用模压工艺制备了舵面,最后完成了舵面自由状态和固支状态下的固有模态测试,同时进行了静强度试验。采用三维实体单元,建立了舵面固有模态有限元分析模型,该模型分析的舵面固有模态与试验结果吻合良好,验证了有限元模型的有效性;并基于该模型研究了舵面在弯曲载荷下的破坏模式。试验结果表明: 舵面首先在根部树脂连接区发生树脂脱粘破坏,进而引起复合材料蒙皮与钛合金骨架的层间分层,从而导致整个舵面失效。有限元分析结果表明: 传感器质量分布对舵面的频率影响很大,但对其振型影响不大。应力分析结果表明: 根部树脂连接区的拉伸正应力导致此处树脂脱粘,有限元预测的破坏位置与试验结果一致。

Manufacturing and testing verification for high temperature composite rudder

The high temperature composite rudder consisted of skin and frame structure was designed and fabricated by press molding process.Then the test of natural modal of composite rudder under free and fixed state was conducted.Finally, the static strength test under bending load was completed.The finite element (FE) model for modal analysis of rudder was generated by using 3D solid element.The calculations of natural modal are consistent well with the test, demonstrating the validity of the FE model proposed in the paper.Based on this FE model, the failure mechanism of rudder under bending load was investigated.The test results show that debonding of resin initially arises at resin connected zone of the rudder, which is followed by inter-laminar delamination propagating along the interface between the composite skin and titanium alloy frame, and finally causes the failure of the rudder.The FE analysis results indicate that the mass distribution of sensors has significant effect on the frequency but slight effect on the mode.The stress analysis results show that the tensile stress causes the debonding of resin at the resin connected zone.The failure location of the rudder predicted by FE method agrees well with the test results.