Radiations is a weekly electronic newsletter published by the Physics and Astronomy Department of Carleton College. The deadline for materials to be included in Radiations is 9:00 AM Monday of the week you would like the information to appear. Contact tfields@carleton.edu if you want to be added or removed from this mailing list.

Volume 19, Issue 26 (May 6, 2013)

PHYS 123 speaker Jill Bingham /04

May 9, 2013
By Trenne Fields

"Ultrasonic Wave Propagation:  Modeling and Use in Nondestructive Evaluation of Aircraft Parts"

Nondestructive Evaluation (NDE) is the inspection of a structure for manufacturing defects or flaws that develop over time that is done without harming the structure.  One technique widely used in the field, ultrasound, has wavelengths on the order of the structures in question.  As ultrasonic waves propagate through a structure, they interact with defects and interfaces via transmission and reflection.  We use this interaction to gain insight into the quality of the part.  This talk will concentrate on how we use wave propagation to understand structure properties using simple techniques like through transmission and pulse echo as well as more complicated wave modes like Lamb waves.  The finite integration modeling technique allows us to visualize the propagation of elastic waves through materials and shapes for further understanding of the complex modes.  Different material systems and geometries have different limitations and structure requirements leading to the need for a wide range of approaches.  Aerospace designs and structures continue to push the need for new NDE techniques and solutions.  


Jill will be available for an informal discussion over refreshments in the Olin 2nd floor lounge following her talk.  

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