超深井钻机刹车盘热疲劳寿命预测

Estimation of thermal fatigue life of brake disc of drilling rig for ultra-deep well

基于刹车盘热疲劳机理和M-C低周疲劳理论公式,对应变幅、温度幅与材料热疲劳寿命之间的关系做了综合分析。根据有限元计算结果,利用疲劳软件FE-fatigue对刹车盘的热疲劳寿命进行了模拟,得出刹车盘寿命云图、损伤云图及最危险节点的雨流循环直方图。综合研究结果表明,刹车盘的热疲劳损伤主要发生在表面层,温度幅越大,热疲劳损伤越严重;刹车盘表面层最危险点的疲劳寿命约为9395次,随着离表面层距离的增加(即温度幅的减小),材料的疲劳寿命逐渐增大,距表面15mm厚度区域可视为无限寿命。

Based on the characteristic of the water cooling disc brakes' thermal field, the study method which is about affecting thermal fatigue life is generally analyzed from the relationship of the temperature range, strain range and the material fatigue life. The brake discs' thermal fatigue life is simulated in this article with the software of FE-fatigue and a lot of results are achieved which include the thermal fatigue life cloud chart, damage cloud chart and rain bar chart of the danger points. The simulation is based on the results of the ANSYS calculation on the thermal field of the brake discs.