Session: FSI-04-01 FSI Design and AI for Industry

Paper Number: 155572

155572 - Evaluation of the Impact Load Acting on a Solid Surface Due to the Collapse of a Laser-Generated Bubble 

Abstract: 

This study investigates the impact of laser-generated vapor bubbles and the resulting shockwave loads on solid structures using a piezoelectric polyvinylidene fluoride (PVDF) sensor. Calibration of the sensor to estimate force values based on emitted voltage is conducted through a ball drop test, with additional correlation using an impact hammer to validate the estimated forces. Key parameters in the sensor calibration include material type (metals and polymers) and the initial drop height in the ball drop test. The dynamic response of these materials is analyzed by comparing their natural frequencies to the frequencies of induced vibrations. A manual correlation is subsequently performed to relate Young’s modulus of each material to the regression between force and voltage calibration, offering insights into material-specific behavior under impact loading. The laser-generated vapor bubbles emit shockwaves propagating to solid materials during the initiation and collapse phases. The experimental parameters include the material type and the stand-off distance of the vapor bubble. The acoustic impedance of the solid materials influences the maximum shockwave load received. A greater stand-off distance reduces the shockwave load on the materials. In our previous numerical study, we reported that the vibration response due to the shock load differs between metals and polymers, and we will examine the acoustic impedance dependence of the shock load by comparing it with the experiment.

Presenting Author: Muhammad Farkhan Abdillah Institute of Science Tokyo

Presenting Author Biography: My name is Farkhan, and I am a doctoral student at the Institute of Science, Tokyo. My research focuses on examining the impact loads of vapour bubble collapse induced by Nd:YAG
laser. I enjoy traveling and have visited nine cities in Japan, particularly in winter. I also like reading books and playing video games on my smartphone.

Authors:

Muhammad Farkhan Abdillah Institute of Science Tokyo
Kazuaki Inaba Institute of Science Tokyo
Hiroaki Nakamoto Ebara Corporation