核级阀门法兰螺栓应力的声弹性测量

Improved Acoustic Elasticity Method for Measuring Bolt Stress of Neclear Class Valve Flange

文中研究了联合采用超声横、纵波声弹性测量螺栓应力的新方法。介绍了螺栓中超声横、纵波往返时间之比的新参数M,该参数只与螺栓中的应力及材料特性相关。无应力时的参数M_o在相同热处理条件下的同种材料的螺栓中是一个常数。该方法已成功地用于测量已加载的核级阀门法兰螺栓中的应力,文中给出了部分测量结果。

An improved ultrasonic method combining the longitudinal and transverse wave acoustic elasticity is discussed. A new parameter M which is the ratio of the trip time for the T-wave to that for the L-wave in a bolt is introduced, the value depends on the stress applied to the bolt and the material property of the bolt. The unstressed bolt parameter M_o is calibrated: it remains constant for any bolt of the same material under the same heat treatment condition. The Method is used successfully for measuring assembled bolt's stresses of nuclear valve flanges.