Numerical Simulation about Effects of Stress on Different Cumulative Second Harmonics

Nonlinear ultrasonic guided waves technology has shown excellent application potential in the field of structural stress testing due to its unique nonlinear characteristics and long distance detection range. However, the diversity and complexity of effects about stress on different cumulative second harmonics constrain the development of related research. In this paper, a numerical study about the response Law of different cumulative second harmonics with stress is undertaken based on ABAQUS software. A plate finite element model is established and the corresponding simulation experiment is carried out. The simulation result demonstrates that the variation tendencies of different cumulative second harmonic modes with stress are different, and their relative nonlinear parameters are monotonically increasing or decreasing with the increase of tensile stress. Therefore, in the application of stress detection, it is essential to analyze the response law of the selected cumulative second harmonic mode with stress change in advance. The simulation method proposed in this paper is also applicable to other studies about nonlinear ultrasonic waves and has wide applicability.