飞机的刹车装置是利用摩擦产生制动将高速运动的动能转换成热能,产生的高温使摩擦材料的物理、化学性质发生变化,由于较大的温度梯度的出现使刹车盘上存在非常大的热应力,使刹车系统的安全性能受到威胁,所以对刹车盘瞬态温度场和由此产生的热应力进行计算就显得非常必要.针对飞机刹车盘瞬态温度场和热应力仿真建立了有限元模型,有限元网格划分采用六面体结构.对刹车过程进行了理论分析与计算,并运用MSC PATRAN/MARC软件对其进行了仿真计算.刹车副的最高温度为1 020℃,与刹车副温度场的经验值基本吻合,在以温度场和刹车副的位移约束为边界条件计算得到刹车副的热应力.热应力的分布特点和温度梯度是一致的,所以热应力的计算结果是合理可行的,可以应用于飞机刹车盘设计过程中.%The brake system of airplanes transforms kinetic energy into heat by friction. Heat causes physical and chemical instability of brake disc,a large temperature gradient result in a very large thermal stress on the brakes,which results in insecurity to the brake system. Therefore, the calculation of the transient temperature field and thermal stress on the brake disc becomes essential. Establish a finite element model for transient temperature field and thermal stress of the aircraft brakes, the grid is knitted from hexahedral. Concentrate on theoretical analysis and digital simulation by MSC PATRAN/MARC. The result meets the actual braking condition, which benefit to the design of aircraft brakes.
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