Ultrasonic non-destructive testing of complex titanium/carbon fibre composite joints

Elena Jasiūnienė; Liudas Mažeika; Vykintas Samaitis; Vaidotas Cicėnas; David Mattsson

doi:10.1016/j.ultras.2019.02.009

Ultrasonic non-destructive testing of complex titanium/carbon fibre composite joints

Ultrasonics. 2019 May:95:13-21. doi: 10.1016/j.ultras.2019.02.009. Epub 2019 Feb 28.

Authors

Elena Jasiūnienė¹, Liudas Mažeika², Vykintas Samaitis², Vaidotas Cicėnas², David Mattsson³

Affiliations

¹ Ultrasound Institute, Kaunas University of Technology, Kaunas, Lithuania. Electronic address: elena.jasiuniene@ktu.lt.
² Ultrasound Institute, Kaunas University of Technology, Kaunas, Lithuania.
³ Swerea SICOMP AB, Pitea, Sweden.

PMID: 30852341
DOI: 10.1016/j.ultras.2019.02.009

Abstract

Ultrasonic inspection is widely used for non-destructive evaluation of composite adhesive joints. However, there are serious challenges in applying ultrasonic testing on metal to composite hybrid joints, because they are multi-layered, made out of dissimilar materials and relatively thin. The ultrasonic signals reflected by different layers are overlapped, scattered and attenuated. The aim of this research was to develop an ultrasonic inspection technique suitable for defect detection in hybrid metal to composite joints where the metal part has pin arrays, which entangle with the composite part. The immersion pulse echo technique was used to collect data. In order to overcome the problems related to the rough surface and non-parallel layers a novel signal post-processing algorithm for reconstruction of the joint area was developed and validated experimentally. It is shown that using the proposed technique the positions of different defects can be determined.

Keywords: Adhesive bonding; Hybrid joints; Non-destructive testing; Ultrasonic testing.