Bolt stress detection method

The invention relates to a bolt stress detection method. The method comprises the following steps: S1, establishing a relation model of ultrasonic time difference and bolt stress; S2, pasting a piezoelectric wafer on one end surface of a bolt, placing an ultrasonic transmitting probe on the other end surface of the bolt to measure a relation curve of ultrasonic time difference-bolt stress, and solving unknown parameters in the relation model to obtain a determined relation model; and S3, carrying out bolt stress detection by using the determined relation model. Compared with the prior art, theenergy loss of the sound wave is reduced, and a received waveform signal is more obvious such that the detection result is more accurate. 本发明涉及一种螺栓应力检测方法，该方法包括以下步骤：步骤S1：建立超声时差与螺栓应力的关系模型；步骤S2：通过在螺栓一个端面粘贴压电晶片并在螺栓另一个端面放置超声发射探头测得超声时差-螺栓应力的关系曲线，并求解关系模型中的未知参数，得到确定关系模型；步骤S3：利用确定关系模型进行螺栓应力检测。与现有技术相比，减少了声波的能量损失，使接收到的波形信号更明显，从而使检测结果更加精确。