摘要
使用盘式刹车下放管柱数较多时，等效应力已超过制动盘材料（铸钢）的屈服极限，制动盘产生塑性变形。在分析盘式刹车热应力及温度场特征的基础上，指出热疲劳与蠕变的交互作用是制动盘失效的主要机理。依据热疲劳理论和蠕变理论导出了一次下放管柱作业过程中在变动温度、变动应力作用下制动盘的热疲劳损伤及蠕变损伤的计算公式，并根据疲劳－蠕变线性累积损伤法则导出制动盘破坏的寿命计算公式，认为总损伤φ≥1时，制动盘失效。
Frequent running of a disc brake lnay caqse plastic deformation of the disc. Based on an analysis of the characteristics of thermal stress and temperature field of the brake, it is declared that the main cause of the failure of the brake discis the interaction of thermal fatigue and creep deformation. The equations for calculating the thermal fatigue damage andcreep deformation damage of the brake disc under the action or variable stress at variable temperature during a well servicing operation are worked out based on the thermal fatigue theory and ereep deformation theoly, and the equation for calculating the service life of the brake disc is derived according to the fatigue－ereep linear superposition principle of damage And it is indicated that the disc fails while the total damage φ is more than 1.
出处
《石油机械》
北大核心
1998年第1期29-31,共3页
China Petroleum Machinery
