Nonlinear ultrasonic detection method for axial stress of bolt

• Main Authors: PAN RUIPENG, PAN QINXUE, LI SHUANGYANG, ZHANG YUNMIAO, CHANG MEILE, XU XIAOYU
• Format: Patent
• Language: Chinese; English
• Published: 24.07.2020
• Subjects: MEASURING; MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE; PHYSICS; TESTING

The invention provides a nonlinear ultrasonic detection method for axial stress of a bolt. The method comprises the following implementation steps: step A, establishing a relation model between a second harmonic amplitude and a fundamental wave amplitude on the basis of a propagation theory of ultrasonic waves in an isotropic medium to obtain an expression of relative nonlinear coefficients; stepb, carrying out an axial stress loading experiment on a bolt sample, carrying out nonlinear ultrasonic detection, and calculating relative nonlinear coefficients under different stress states; and step c, fitting the loaded axial stress and the corresponding relative nonlinear coefficients, determining an ultrasonic detection coefficient of the axial stress of the bolt, and finally obtaining a relational expression of the axial stress of the bolt and the relative nonlinear coefficients. By means of the steps, nonlinear ultrasonic detection of the axial stress of the bolt can be realized, the axial stress of the bolt c