Ultrasonic tomography for materials characterization

Mapping of Materials Stress with Ultrasonic Tomography

It is _known _that internal stress concentrations can give rise to microcracks which then grow when the str~cture 1s subJected to external forces. It has also been found that the velocity'of sound is altered as ~t propagates through a region of stress. In this paper we discuss a technique called ComputerAsslsted Tomography (~AT) and describe ~n application that provides pictures of stress field...

Ultrasonic Characterization of Advanced Composite Materials

With increased use of composite materials in critical structural applications it is more important than ever to independently assure structural integrity. Complexity of the advanced composite materials including layered and bonded structures represents challenges in developing optimized ultrasonic tests. Traditional ultrasonic NDT methods are inappropriate and often misleading when applied to a...

Ultrasonic method of materials characterization for recognition buried objects

Among the ultrasound based NDT methods and techniques, some are used for materials characterization. In a typical situation, some of the measurable properties of a tested object’s material are used as a data set for characterization. The basis of measurements are properties of an ultrasonic pulse that can propagate through the object. In order to obtain intense enough registered ultrasonic puls...

Characterization of Cement-Based Multiphase Materials Using Ultrasonic Wave Attenuation

To my family and friends who make me who I am ACKNOWLEDGEMENTS This work would not have been possible without the support from a number of people who encouraged me during my stay in the United States. Most importantly, I would like to thank Prof. Laurence 'Larry' Jacobs for being an outstanding advisor, teacher, and friend, supporting me in an unprecedented way during my stay at Georgia Tech. F...

Ultrasonic Characterization of Materials with Applications in Bone Tissue Modeling