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基于细观力学有限元法,采用改进的细观力学代表体积元(RVE)模型预测连续纤维增强金属基复合材料力学性能,对比分析相同体积分数下不同排列RVE模型的计算结果.选定连续纤维增强金属基复合材料轴结构为研究对象,建立连续纤维增强金属基复合材料轴结构细、宏观力学模型,开展该轴结构承载能力计算.在此基础上,为实现连续纤维增强金属基复合材料低压涡轮轴铺层方案优化设计,参照某型航空发动机设计要求,以总铺层厚度为目标函数,采用random design法,确定了由细观RVE排列结构至宏观轴结构铺层方案.结果表明:采用正方形对角排列RVE模型计算的力学性能优于四边形排列RVE模型;纤维与基体呈正方形对角排列可提高轴结构承载能力、临界屈曲载荷、临界转速;该方法确定的铺层方案与通用(GE)公司的SiC/Ti低压涡轮轴铺层方案一致.
Based on the mesomechanical finite element method, the mechanical properties of continuous fiber reinforced metal matrix composites were predicted by an improved volume representation of meso-element (RVE) model, and the results of RVE model with different volume fraction were compared. To enhance the shaft structure of metal matrix composites as the research object, the thin and macroscopic mechanical model of the shaft structure of continuous fiber reinforced metal matrix composites was established and the calculation of bearing capacity of the shaft structure was carried out.On this basis, in order to realize the low pressure of continuous fiber reinforced metal matrix composites According to the design requirements of a type of aero-engine, taking the total thickness of the ply as the objective function, the random design method was used to determine the layout scheme of the micro-axis RVE to the macro-axis structure.The results show that: The diagonal arrangement of square diagonal RVE model is better than the RVE model of quadrangular arrangement. The square diagonal arrangement of fiber and matrix can improve the bearing capacity, critical buckling load and critical speed of the shaft. ) The company’s SiC / Ti low-pressure turbine shaft coating program consistent.