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建立了石油钻采设备用盘式刹车制动盘热应力计算数学模型，并应用有限元方法计算了连续下放管柱时制动盘的热应力场。计算与分析表明，制动盘热应力有如下特征：制动盘周向热应力最大，热应力梯度主要在轴向，摩擦表面层1~2mm处是高热应力区；下放一根管柱时制动盘摩擦表面层的等效效应力具有微观脉动性，连续下放管柱对具有宏观波动性；制动盘摩擦表面层热应力值远大于其机械应力值，在某些工况下热应力峰值已超过常用工程材料的屈服极限。
The mathematic model of thermal stress calculation of disc brakes used in oil drilling equipment is established and the thermal stress field of brake disc is calculated by finite element method. The calculation and analysis show that the thermal stress of the brake disc has the following characteristics: the thermal stress in the brake disc is the largest in the circumferential direction, the thermal stress gradient is mainly in the axial direction and the high thermal stress zone is 1 ~ 2mm in the friction surface layer; The equivalent effective force of the friction surface layer of the moving disc has micro-pulsation and the macro-fluctuation of the continuous pair of pipe columns is macroscopically fluctuating. The thermal stress value of the friction surface layer of the brake disc is far greater than its mechanical stress value. In some working conditions, Has exceeded the yield limit of commonly used engineering materials.