Back to Search Start Over

Detection of defects in thermoplastic CFRP welded zones using eddy current thermo-sensing

Authors :
Koichi MIZUKAMI
Yoshihiro MIZUTANI
Akira TODOROKI
Yoshiro SUZUKI
Source :
Nihon Kikai Gakkai ronbunshu, Vol 80, Iss 812, Pp SMM0084-SMM0084 (2014)
Publication Year :
2014
Publisher :
The Japan Society of Mechanical Engineers, 2014.

Abstract

In recent years, thermoplastic CFRP attracts considerable attention especially in aviation and automobile industries due to weldability of thermoplastic CFRP. Ultrasonic testing (UT) is commonly adopted as a testing method for inspecting weld parts although time cost on UT is thought to be problematic. Since eddy current testing (ET) is used for rapid inspection on electrically conductive materials, this paper presents an eddy current based approach for detecting defects in thermoplastic CFRP welded zones. However, it is difficult for conventional ET to detect delamination which is parallel to eddy current although delamination is one of the common forms of weld defect. To detect delamination in thermoplastic CFRP welded zones, new eddy current based approach which utilizes temperature characteristic of electrical conductivity is proposed. The proposal consists of two steps. Firstly, temperature difference between intact zones and defective zones is caused by heating the one side of the weld part. Secondly, the temperature difference is detected by ET utilizing temperature dependency of electrical conductivity.

Details

Language :
Japanese
ISSN :
21879761
Volume :
80
Issue :
812
Database :
Directory of Open Access Journals
Journal :
Nihon Kikai Gakkai ronbunshu
Publication Type :
Academic Journal
Accession number :
edsdoj.91c82e3c51ca4b2e9746fd0bf86f95ef
Document Type :
article
Full Text :
https://doi.org/10.1299/transjsme.2014smm0084