Evaluation and prediction of glass health using nonlinear coefficient of ultrasound

Glassis a kind of inorganic material which is widely used in many fields and plays an important role in our life. Stress existed in the glass has effect on the health status of the glass and even break it. So, stress detection for glass production becomes more important. In this paper, the nonlinear coefficient of the ultrasonic wave propagated in the glass is used to evaluate and predict the health of stress existed in the glass. The finite element model of the measurement system is setup to study its performance. The simulation results show that the pulse signal waveform changes significantly when a certain external force is applied on one side of the flat glass. If there is stress in glass, the second harmonic component appears in the ultrasonic signal, and the values of the nonlinear coefficient linearly change with the stress, which shows the feasibility of using nonlinear method to detect glass stress.