风电主轴制动器制动盘的应力分析

Stress analysis for disc of wind turbine spindle brake

利用ANSYS软件建立了风电主轴制动器制动盘三维实体模型,分析了紧急制动工况下其机械应力场和热应力场。结果表明:制动盘机械应力场和热应力场均呈对称分布。其中,制动盘机械应力最大值出现在最外层螺栓孔处,为39.79 MPa;热应力场中,最大热应力值发生在制动时间7.89 s时,位于摩擦区域内侧与非摩擦区交界处,达到289 MPa;两者均小于材料的屈服极限345 MPa,且热应力最大值远大于机械应力最大值,由此可知热应力是引起制动盘失效的主要因素。

In this paper,wind power spindle brake discs were carried out on three-dimensional solid model by ANSYS,while mechanical stress and thermal stress field were performed for this model of emergency braking. The results showed that the brake disc mechanical stress and thermal stress field both present a symmetrical distribution.Among them,brake disc mechanical maximum stress was shown on the outermost bolt holes for 39. 79 MPa; Thermal stress field,the maximum thermal stress occurs when braking time 7. 89 s,located inside of the friction zone and non-friction zone at the junction to reach 289 MPa; Both less than the material yield limit of 345 MPa,and the maximum thermal stress was greater than mechanical stress. Thus the thermal stress was the main factor that caused the failure of brake disc.