速度对含夹杂物动车车轮轮辋疲劳寿命影响的研究

动车车轮轮辋疲劳裂纹常起裂于夹杂物聚集区,大尺寸的夹杂物聚集将会对其疲劳寿命产生影响。通过动力学仿真及有限元仿真结合材料疲劳试验确定了不同速度下含夹杂物车轮轮辋的概率疲劳寿命的方法。为了预估不同速度下含夹杂物动车车轮轮辋疲劳寿命,以CRH5型动车车轮为研究对象,建立了车辆动力学模型和含夹杂物的轮轴有限元模型,得到不同速度下车轮的随机载荷时间历程和危险部位的应力-时间历程,基于不同置信度和存活率下的S-N曲线和Miner准则对含夹杂物动车车轮轮辋进行疲劳寿命预估。结果表明:在相同的置信度和存活率下,随着速度的提高,含夹杂物车轮轮辋疲劳寿命会明显缩短;在相同的速度和置信度下,随着存活率的提高,含夹杂物车轮轮辋疲劳寿命会明显缩短;在相同的速度和存活率下,随着置信度的提高,含夹杂物车轮轮辋疲劳寿命会明显缩短。

STUDY ON THE EFFECT OF VELOCITY ON THE FATIGUE LIFE OF WHEELS RIM CONTAINING INCLUSIONS

The fatigue crack of the wheel rims often explodes in the inclusions gathering area,and the accumulation of large inclusions will affect their fatigue life.In this article,through dynamic simulation and finite element simulation combined with material fatigue test to determine the probability of containing inclusions wheel rim method of fatigue life at different speeds.In order to estimate the fatigue life of the train wheel rim with inclusions at different speeds,the vehicle dynamics model and the wheel axle with inclusions finite element model of EMUs CRH5 were established.Then obtain the random load time history of the wheel and the stress time history of the dangerous parts at different speeds.Based on the different confidence degrees、survival rates of the S-N curve and the Miner criterion to establish fatigue life of the wheel rim containing inclusions.The results show that under the same confidence degree and survival rate,as speed increases,the fatigue life of wheel rim containing inclusions will obviously shorter;under the same speed and confidence degree,as survival rate increases,the fatigue life of wheel rim containing inclusions will obviously shorter;under the same speed and survival rate,as confidence degree increases,the fatigue life of wheel rim containing inclusions will obviously shorter.