POSITION IN ULTRASONICS NONDESTRUCTIVE EVALUATION

POSTDOCTORAL

At the Georgia Institute of Technology, Campus Georgia Tech Lorraine in Metz, France.

Starting date: Spring 2016. Duration: 1 year with extension possible.

Laboratory : Nico F. Declercq, laboratory for ultrasonic nondestructive evaluation.

Contact: Nico.Declercq@me.gatech.edu

Applicants must submit their credentials and short letter of motivation to Nico Declercq by email.

SUBJECT: Guided ultrasonic waves for defect detection in plates (with permission to work on related topics as well and with possibilities to work in close collaboration with one of the biggest companies in the world of steel)
CONTEXT:Guided waves are known as possible tools to investigate plate-like materials, appearing in the steel industry, composites industry, pipeline industry etc. Such waves are useful because they are guided by the structure in which they are generated and propagate over significant distances in a very short time. In principle they therefore are good candidates to detect defects in materials in a very short time without the need to move a scanner. In certain industries they also allow the generation of ultrasonic waves in a remote location of the material from where the wave can propagate towards more hazardous areas in the material without harming the transducer or the operator. The difficulty however is that guided waves do not behave in a uniform manner. Each structure and each possible frequency require a specific understanding. For this reason this study is quite general and will, for given samples, investigate a whole range of circumstances to find out which combination of frequency and structural parameter, such as thickness, is most useful for the aimed goals. Ultrasonic equipment will be used at a whole range of frequencies, depending on the structures, from 0.5 MHz to 2 GHZ. The latter will be done with an acoustic microscope in which local guided waves’ behavior is investigated. In this proposal preliminary results are shown.

 

PHD STUDENT

At the Georgia Institute of Technology, Campus Georgia Tech Lorraine in Metz, France.

Starting date: Spring 2016. Duration: 3 years with extension possible. Student needs to be in the possession of a Master’s Degree in Engineering. Student will be enrolled as a regular Georgia Tech PhD student therefore needs to pass TOEFL and GRE exams and apply through the graduate program of the George Woodruff School of Mechanical Engineering at Georgia Tech Atlanta. More details will be provided upon request by the student.
Applicants must submit their credentials and short letter of motivation to Nico Declercq by email.

Laboratory : Nico F. Declercq, laboratory for ultrasonic nondestructive evaluation.

Contact: Nico.Declercq@me.gatech.edu

SUBJECT: Acoustic Microscopy to investigate complex features of novel materials

CONTEXT: Acoustic microscopy is the use of very high frequency acoustic waves (1 GHz or more) to investigate materials and structures at the micron and nanoscale. Traditionally this was done at frequencies lower than what our laboratory can achieve and for relatively convenient layered materials having a flat shape. Here we will use the newest generation acoustic microscope, new in France and one of the first in the world. The technique will be tested and applied beyond the traditional limits; this will include cylindrical materials, periodic structures and other 3 dimensional structures. Because the involved phenomena are complicated and require a thorough understanding of the physics occurring for such complex scattering phenomena, the experiments will be done at different scales. For large scales we will use lower frequencies and a large ultrasound scanner. Step by step we will downsize the studied objects to almost the nanoscale while increasing the frequency from 1 MHz to 2 GHz. Not only will this research contribute to the fundamental understanding of the interaction of ultrasound with complex materials, it will result in knowledge that may be applied in related research fields such as nondestructive testing of steel structures and optoelectronic components in top-notch technology. In this proposal images are shown that have already been obtained in our lab. The preliminary results show that the research is possible and that interesting results are to be expected.