Characterizing Cracking Sound of Prosthetic Material Block Made by Ceramic and PMMA

Abstract

The purpose of this study is to characterize cracking sound of prosthetic material block made by ceramic and PMMA The acoustic emission (AE) testing is one of the non-destructive test method it can detect the AE signal of materials during loading and distinguish the failure mode of the material The statistical analysis- gaussian mixture model(GMM) can provide smooth approximations to fit the AE data distribution then divide the AE data into two categories: tensile and shear The results showed that the ultimate strength of ceramics is higher than PMMA and the amount of signals are also more than PMMA during the compressive test As the load duration curves was observed the sawtooth shape it represents the larger crack and the higher value can be observed against the energy diagram In the crack mode analysis the three specimens performed similarly The rise angle (RA) approximately distribute at RA=0~5 ms/V and the average frequency (AF) at AF=0~200 kHz According to the GMM fracture mode analysis all specimens are dominated by tension failure and ceramics contain relatively more shear failure than PMMA The signal-based analysis method can obtain the frequency domain of the spectral peak of each material The statistical results show that the most frequency domain of each material : ceramic: 175~200 450~475 100~125 kHz; PMMA : 100~125 225 ~250 450~475 kHz; Composite : 450~475 175~200 125~175 kHz and the signal that be obtained from the interface between PMMA and ceramic is estimated to be 125~175 200~225 450~525 kHz

Date of Award	2019
Original language	English
Supervisor	Tsung-Chin Hou (Supervisor)