摘要
建立钛基复合材料叶环三维循环对称有限元模型,分析其应力分布和超转失效。重点研究纤维体积分数、增强面积、热残余应力及2种不同温度对叶环应力分布的影响。通过分析在一系列转速下叶环的环向应力得到其极限转速。结果表明:在2种不同温度下,纤维体积分数和增强面积对叶环应力的分布和大小影响不同。研究结果为叶环的结构设计提供了一定的建议。当考虑热残余应力时,在较高的温度下,较大的增强面积对叶环的设计是有利的。
A three-dimensional cyclic symmetry finite element model of titanium-matrix composites（TMCs） ring was developed to investigate the stress distribution and burst failure. The effects of fiber volume fractions, reinforced areas, thermal residual stresses and two different temperatures on stress distribution were studied. The burst speed was obtained through analyzing the hoop tensile stresses under a series of rotating speeds. The results indicate that at the two different temperatures, the influences of fiber volume fractions and reinforced areas on stress level and distribution are different. Some proposals are provided for the structure design of the TMCs ring. With regard to thermal residual stresses, a larger reinforced area is an advisable choice for design of the ring at higher temperature.
基金
Projects(51071122,51271147,51201134)supported by the National Natural Science Foundation of China
Project(3102014JCQ01023)supported by the Fundamental Research Funds for the Central Universities
Project(115-QP-2014)supported by the Research Fund of the State Key Laboratory of Solidification Processing in Northwestern Polytechnical University,China
关键词
钛基复合材料
叶环
应力分布
超转失效
有限元模拟
热残余应力
titanium-matrix composites
ring
stress distribution
burst failure
finite element analysis
thermal residual stresses
