复合材料转子环形开闭裂纹刚度的解析模型及特性研究

Analytical model and characteristics of circular breathing crack stiffness of composite rotor

碳纤维复合材料传动轴作为一种新型高性能传动部件在制造过程中或受到碰擦时容易产生具有环形特征的裂纹。本文基于复合材料Layer-wise理论建立了复合材料转子环形开闭裂纹的刚度解析模型,该模型考虑了裂纹处铺层角度和顺序的影响,并且采用有限元模型进行了验证;通过对相同尺寸、不同铺层方案的复合材料裂纹转子的刚度对比分析。结论表明:本文提出的解析模型具有较好的计算精度;环形裂纹处0°铺层比例对转子刚度的影响较大,而环形裂纹处0°铺层顺序对刚度变化的影响很小,可忽略不计。

The carbon fiber reinforced plastic transmission shaft is a new type of high-performance transmission component,but the composite transmission rotor is easy to cause circular crack in the manufacturing process or when it is collided.In this paper,the stiffness analytical model of the circular breathing crack of composite transmission rotor is established based on the Layer-wise theory of composite structures,which considers the influence of orientation angle and stacking sequence at the crack,and is verified by finite element model.Then the stiffness of composite cracked rotor with the same size and different laminate schemes are compared.The results show that the analytical model proposed in this paper has good accuracy,and the ratio of 0°ply at the circular breathing has a great influence on the bending stiffness of the shaft tube.What′s more,the stacking sequence of the 0°ply has little effect on the bending stiffness,which can be ignored.