涡扇发动机拉紧轴疲劳试验

针对涡扇发动机拉紧轴在工作环境中所存在的疲劳失效问题,提出基于有限元法(FEM)与Miner线性累积损伤理论相结合的理论模型,实现了已知涡扇发动机拉紧轴材料、几何尺寸等条件下的标准载荷循环谱计算.进一步开展了风扇拉紧轴的疲劳寿命试验测试与分析,结果表明,试验中拉紧轴可承受30 000次试验载荷循环数,试验之后经检查无裂纹、凸肩切入、螺纹断扣等失效现象,最终确定其在标准载荷循环下的安全使用寿命.通过开展对拉紧轴的疲劳试验研究、仿真计算与分析等工作,有效验证了可靠性寿命预测方法与模型的可行性.

Fatigue test for tension shaft of a turbofan engine

Aiming at the fatigue failure problem of tension shaft for a turbofan engine in the working environment, the theory model based on the combination between finite element method(FEM)and the Miner linear cumulative damage theory was proposed. The calculation of standard cycle load spectrum was implemented under the condition of knowing the materials and geometry size of tension shaft. Furthermore, the fatigue life test and analysis for the fan tension shaft were carried out. The results show that in the test, the tension shaft can bear 30 000 times of test cycle load, and the tension shaft does not exist such failure phenomena as the cracks, cutting of convex shoulder and broken buckle of thread after the test. The security service life was determined under the standard cycle load. Through performing the fatigue test research and simulation calculation analysis for the tension shaft, the feasibility of both reliability life prediction method and model is verified.