Weak bond detection in composite-adhesive joints is a highly challenging task the non-destructive testing (NDT) community. This paper aims to evaluate bonding quality bonded structures with high-frequency high-resolution acoustic microscopy. Carbon fibre reinforced epoxy-epoxy single-lap containing three different -debonding, weak less and more contamination, addition perfect were investigated. Shape-based feature extraction algorithm frequency domain was developed order detect bonds. The...

Multilayer printed circuit boards (PCBs) can be produced not only in the traditional way but also additively. Both and additive manufacturing lead to invisible defects internal structure of electronic component, eventually leading spontaneous failure device. No matter what kind technology is used for production PCBs, when they are important structures, quality control ensure reliability component. The nondestructive testing (NDT) manufactured components help devices. Investigations possible...

The objective of this study is to compare the performance different ultrasonic non-destructive testing (NDT) techniques for bonding quality evaluation. Aluminium-epoxy-aluminium single lap joints containing debonding in form release film inclusions have been investigated using three types NDT methods: contact testing, immersion and air-coupled testing. Apart from traditional bulk wave ultrasound, guided was also performed air coupled transducers excitation waves. Guided propagation within...

<title>Abstract</title> Although teeth microcracks (MCs) were recently characterized in three-dimensions (3D), it is still unknown whether there are changes the tooth material within MC compared to uncracked enamel. Thus, spectral analysis of cracked area could provide information on composition along crack line. However, this followed by major methodological challenge – find same using different methods. Therefore, aim study was identify crack-affected and pristine regions combining X-ray...

This article compares different air-coupled ultrasonic testing methods to characterize impact-type defects in a pultruded quasi-isotropic glass fiber-reinforced plastic (GFRP) composite plate. Using the transducers, comparisons among three were performed, namely, bulk-wave through transmission, single-side access using guided waves, and ultrasonic-guided wave tomography. The air coupled transmission technique can determine size shape of with higher resolution, but consequence time...

This work aims to compare quantitatively different nondestructive testing (NDT) techniques and data fusion features for the evaluation of adhesive bonding quality. Adhesively bonded composite-epoxy single-lap joints have been investigated with advanced ultrasonic induction thermography. Bonded structures artificial debonding defects in three case studies investigated: release film inclusion, brass film-large, film-small. After completing preprocessing fusion, feature matrices, depending on...

Wind turbine blades are complicated objects for inspection because they have a curved surface, multi-layered, variable thickness and made from anisotropic materials. Ultrasonic contact pulse-echo immersion testing with moving water container has been selected of wind blades, this type the can be performed having access just one side blade. The ultrasonic technique two types transducers mounted into was used investigation artificial internal defects in These (diameter 81 mm, 49 mm 19 mm) were...

The aim of this work is to achieve reliable nondestructive evaluation (NDE) adhesively bonded aerospace components by developing novel multidimensional data fusion techniques, which would combine the information obtained ultrasonic and X-ray NDE methods. Separately, both techniques have their advantages limitations. integration from pulse echo immersion ultrasound testing radiography holds immense potential help improve reliability non-destructive evaluation. In study, distinctive features...

Ultrasonic non-destructive evaluation in pulse-echo mode is used for the inspection of single-lap aluminum adhesive joints, which contain interface defects bonding area. The aim research to increase probability defect detection addition ensuring that sizes are accurately estimated. To achieve this, this study explores additional ultrasonic features (not only amplitude) could provide more accurate information about quality structure and presence defects. In work, two types defects, namely...

Adhesively bonded dissimilar materials have attracted high interest in the aerospace and automotive industries due to their ability provide superior structural characteristics reduce weight for energy savings. This work focuses on improvement of disbond-type defect detectability using immersion pulse-echo ultrasonic technique an advanced post-processing algorithm. Despite extensive done investigation, it is still challenging locate such defects material joints large differences properties...

This study presents an ultrasonic non-destructive method with convolutional neural networks (CNN) used for the detection of interface defects in adhesively bonded dissimilar structures. Adhesive bonding, as weakest part such structures, is prone to defects, making their challenging due various factors, including surface curvature, which causes amplitude variations. Conventional methods and processing algorithms may be insufficient enhance detectability, some influential factors cannot fully...