高速飞行时,常因空气的阻力而产生所谓的空气动力加热。在大迎角下速度突然增加时,由于骤然加热及温度产生显著的梯度,结构中产生附加的应力。 在导弹以高速重新进入大气时亦产生骤然加热。 强度的标准。高速航空用材料必须具有高的单位强度。为此,可采用数种符合材料在高速飞行时工作条件的机械性能试验方法。 瞬时拉伸试验时,将试样迅速地加热至而需温度,并于该温度下保持一定时间后,以高速试验。改变保持时间和负荷,可以得出有关 High-speed flight, often due to air resistance and the so-called aerodynamic heating. At sudden increases in speed at high angles of attack, additional stress is generated in the structure due to sudden heating and significant temperature gradients. Sudden heating also occurs when missiles reentry into the atmosphere at high speed. The standard of strength. High-speed aerospace materials must have high unit strength. To this end, several mechanical properties test methods that meet the working conditions of materials at high speed can be used. Instantaneous tensile test, the sample quickly heated to the required temperature, and at this temperature for a certain period of time, the high-speed test. Change hold time and load can be drawn about