Ultrasonic and Electromagnetic Waves for NDE and SHM

2013-06-12

 Ultrasonic and Electromagnetic Waves for NDE and SHM

 

Speaker : Prof. Tribikram Kundu

 Department of Civil Engineering and Engineering Mechanics

Aerospace and Mechanical Engineering Department

University of Arizona, Tucson, Arizona

 

     Use of ultrasonic and electromagnetic waves is continuously increasing for nondestructive evaluation (NDE) and structural health monitoring (SHM) in civil, aerospace, electrical, mechanical and biomedical engineering applications.  Between bulk waves and guided waves the later is becoming more popular for NDE/SHM applications because the guided waves can propagate long distances and reach regions that are difficult to access otherwise.  Recent advances in research related to NDE and SHM of various structures using ultrasonic guided waves and electromagnetic waves will be discussed with experimental results.  To analyze the experimental results often one needs to understand the mechanics of wave propagation in various problem geometries. Unfortunately, only for simple structures, such as homogeneous and layered half-spaces, unbounded plates, rods and pipes, the analytical solutions are available.  Complex structures with internal defects are difficult to solve analytically or numerically by the popular finite element method because the size of the finite elements becomes prohibitively small at high frequencies.  An alternative mesh-free technique called the distributed point source method (DPSM) is being developed for solving such problems and will be presented along with the experimental results.