Electromagnetic Nondestructive Testing of Fiber Reinforced Plastics

Speak:     Prof. Toshiyuki TAKAGI

Time:       13:00-13:50, Oct. 29

Location:  SIST 1A 200

Host:       Prof. Chaofeng Ye

Abstract:

Carbon fiber reinforced plastic (CFRP) has been adopted for structural materials in the fields of aerospace and automobile industries. The establishment of nondestructive testing (NDT) techniques for CFRP products is urgently needed. Eddy current testing (ECT) is the method which is employed as much as ultrasonic testing (UT) for inspection for CFRP because of its ability that can inspect fiber orientation. Fiber waviness is the local misalignment defect that should be inspected since it affects the strength of composite products. Eddy current differential probe with two pickup coils can obtain relatively higher spatial resolution. To generate a wide-range directed magnetic field, we propose two types of differential probes: symmetrical driving type and uniform driving type.We also introduce an electromagnetic pulse-induced acoustic testing (EPAT) method for nondestructive testing for debonding detection in composite/metal adhesive joints. A pulsed magnetic field excites conductive material and generates an acoustic signal, and defects in adhesive joints are inspected by measuring and analyzing the acoustic signal.

Bio:

Toshiyuki Takagi (Dr. Eng.) received his B.Eng., M.Eng., and D.Eng. degrees in nuclear engineering from the University of Tokyo, Japan, in 1977, 1979, and 1982, respectively.

He was a researcher at the Energy Research Laboratory of Hitachi Ltd. from 1982 to 1987 and Associate Professor at the Nuclear Engineering Research Laboratory of the University of Tokyo from 1987 to 1989. From 1989 to 1998 he was Associate Professor, and since 1998 has been Professor, at the Institute of Fluid Science, Tohoku University. His current research interests include maintenance engineering, nondestructive evaluation of materials and structures using electromagnetic phenomena, and diamond and diamond-like carbon coatings and their application. He is author of more than 400 international journal papers. He is editor-in-chief of International Journal of Applied Electromagnetics and Mechanics.

Sist seminar 18212