Measurement of the elastic modulus distribution of PET bottles by ultrasonic Lamb waves

This paper presents a method for measuring the elastic modulus distribution of PET bottles. The method utilizes ultrasonic Lamb waves, which are generated and collected from various positions on the bottle surface. The collected signals are then processed to calculate the group velocities of the zero-order symmetric Lamb wave mode (S0 mode). An optimization algorithm is employed to extract the elastic modulus of the material based on the velocity data. To validate the proposed method, a dedicated test rig was developed and implemented. The measured elastic modulus of the bottles was subsequently compared with their tensile modulus, providing further insights into the accuracy and reliability of the approach. Overall, this paper introduces a novel technique for characterizing the elastic modulus distribution in PET bottles. By leveraging ultrasonic Lamb waves and an optimization algorithm, the method offers a non-destructive and efficient means of assessing the material’s mechanical properties. The experimental results obtained through the developed test rig demonstrate the effectiveness of the proposed approach, highlighting its potential for quality control and evaluation in the manufacturing industry.