Theses and Dissertations - UTB/UTPA
Using commercial finite element code called ABAQUS in modeling hybrid constrained layers damping beam structure and quantitative determination of the stability of implant-bone interface using resonance frequency analysis
Date of Award
Master of Science (MS)
Dr. Arturo Fuentes
Dr. Robert E. Jones
Dr. Arnold Lumsdaine
In Chapter 1, it has been demonstrated that the damping treatments for beam and plate structures are effective, and the vibrational behaviors of the systems considered are influenced by many geometrical and material parameters. This has led to an interest in developing advanced “intelligent” structures. In the past, passive and active damping mechanisms have been used to reduce vibration. The uses of passive constrained layers are limited, but it has dissipative qualities for all the modes of the structure; and the uses of active constrained layers are limited to a single mode control. Recent published papers, many have suggested that a hybrid of active and passive would be the best method to use, but many have to create their own Finite Element Method code to model these hybrids structures and experimentally validate the FEM code. In this chapter we focus on active and passive constrained layers for damping structures, and we have been modeling these structures in a commercial code called ABAQUS. Therefore, the code is going to be validated with experimental and theoretical data of previous paper and determining that the code is accurate to the experimental and theoretical value give the certain material properties, and it can also be used for other structures that are more complex.
In Chapter 2, it is important to have a quantitative method to establish a standard way to measure stability and osseointegration of implants. Among other benefits, these measurements would provide information leading to the prediction of healing time and the implant and the monitoring of the health of the implant’s interface.
The dental industry has been looking for non-destructive methods to measure implant integration within the bone. In previous studies, resonance frequency analysis revealed a clear relationship between resonance frequency measurements and stiffness of the implant interface and the effective length of the implant. Earlier studies have examined only one mode of vibration or have suffered from measurement difficulties. Furthermore, no study has evaluated the damping properties of the interface and surrounding tissues.
This chapter describes the development of an instrument capable of capturing and measuring information to characterize the process of dental implant osseointergration. The parameters needed to measure stability and osseointegration of implants are the stiffness of the implant components (which are a function of their geometry and material composition) and the stiffness and damping properties of the implant-bone interface and surrounding tissues. The instrument developed provides valuable information about the stiffness and damping properties of the implant-bone interface obtained through resonance frequency analysis with torsional, longitudinal and transverse vibration. Experimental, analytical, and finite element analysis results are presented.
University of Texas-Pan American
Copyright 2002 Daniel Delgado Jr. All Rights Reserved.