连续纤维增强金属基复合材料涡轮轴结构承扭特性分析

Analysis on torsional feature of continuous fiber reinforced metal matrix composite turbine shaft

为实现对该类复合材料部件结构完整性的设计分析,以连续纤维增强复合材料轴结构为研究对象,对比分析4种细观力学模型计算连续纤维增强金属基复合材料的力学性能参数;在此基础上,采用RVE(代表体积元)有限元模型计算的复合材料力学性能参数作为输入,建立连续纤维增强金属基复合材料轴结构力学分析模型.计算与对比分析不同材料方案下纤维增强金属基复合材料轴结构在扭转载荷作用下的变形量及承扭能力,当纤维体积分数一定时,方案4的变形量最小,方案2的临界屈曲转矩最大.

To realized design and analysis of composite parts structural integrity,the low pressure turbine shaft was taken as the object of research.Firstly,four kinds of micromechanical methods were utilized to calculate the mechanical parameter of continuous filament reinforced metal matrix composite.Secondly,the calculated parameters of RVE（representative volume element）finite element model were taken as input and the mechanics analysis model of fiber reinforced metal matrix composite shaft was built.The optimal solution could be got by calculating the deformation and bearing capacity of continuous filament reinforced metal matrix composite shaft with torsion load and by comparing with the deformation and bearing capacity of shaft with different laminate schemes;in case of certain fiber volume fraction,the deformation of scheme 4is the smallest,and the critical buckling torque of scheme 2is the greatest.