Application of Ultrasonic C-Scan Techniques for Tracing Defects in Laminated Composite Materials

Hasiotis, Theodoros; Badogiannis, Efstratios; Tsouvalis, Nicholas G.

doi:10.5545/sv-jme.2010.170

Cited by 78 publications

(31 citation statements)

References 7 publications

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“…Ultrasonic testing is considered as the most efficient inspection method in all major industries, such as electrical and electronic components manufacturing, metallic and composite material production, structures fabrication like airframes, piping and pressure vessels, ships, bridges, motor vehicles, machinery and jet engines [32]. Ultrasonic testing methods are the most applied methods in non-destructive testing of multi-layered composites [33].…”

Section: Ultrasoundmentioning

confidence: 99%

A feasibility study on different NDT techniques used for testing bond quality in cold roll bonded Al-Sn alloy/steel bimetal strips

2017

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-This paper presents non-destructive testing (NDT) results for the detection of bond defects in aluminiumtin (Al-Sn) alloy/steel bimetal strips. Among all types of bimetal strip that are used in the automotive industry for plain journal engine bearings, Al-Sn alloys cold roll bonded (CRB) onto steel backing is the most common type. The difficulty to evaluate the metallurgical bond between the two dissimilar metals is a major industrial concern, which comprises the risk that bearings fail in the field. Considering the harsh performance requirements, 100% online non-destructive testing would be desirable to significantly reduce the business risk. Nowadays bimetal strip manufacturers still rely on destructive testing through different peel-off tests. This work offers the results from four independent NDT studies, using active thermography, shearography, ultrasound and guided wave electromagnetic acoustic transducers (EMATs) and samples with different artificially implanted defects, to explore the feasibility to qualitatively indicate the occurrence of bond defects. A destructive peel off test was used to correlate the NDT results with known bond quality. The studies were done under laboratory conditions, and in case of ultrasound also online under production conditions. During the ultrasound online test, the requirements that a NDT technique has to fulfil for online inspection of Al-Sn alloy/steel bimetal strip were established. For active thermography, shearography and guided wave EMAT techniques, it was theoretically analysed, if the laboratory test results could be transferred to testing under production conditions. As a result, guided waves using EMATs, among the four tested methods, are best suited for online inspection of Al-Sn alloy/steel bimetal strip. This research was carried out in collaboration with MAHLE Engine Systems UK Ltd., an Al-Sn alloy/steel bimetal strip manufacturer for the automotive industry.

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Section: Ultrasoundmentioning

confidence: 99%

A feasibility study on different NDT techniques used for testing bond quality in cold roll bonded Al-Sn alloy/steel bimetal strips

2017

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“…In the case of pulse-echo approach, both the generation of the ultrasonic energy and the capturing of the reflected signal can be achieved through different ways, either using a single transducer or through the aid of a phased array configuration [9,10]. Regardless the instrumentation (single transducer or multiple elements), data can be displayed in a variety of modes with the B-scan and C-scan representations being the most appropriate when internal inhomogeneities have to be assessed [11].…”

Section: Introductionmentioning

confidence: 99%

Comparative evaluation of aerospace composites using thermography and ultrasonic NDT techniques

et al. 2015

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In the present research work a study was carried out evaluating the applicability of two NDT techniques, this of Transient Thermography (TT) and Ultrasonic Testing (UT) for the inspection of different types of composite materials (i.e. laminated CFRPs, laminated hybrid FRPs and sandwiched panels). The composite structures were consisted of a variety of artificial defects, while inspection was performed through different testing configurations. In particular, transient thermography was implemented through the monitoring of the surface transient cooling after flash heating the samples and ultrasonic testing was applied using both a conventional single element probe (immersion technique) and a linear phased array transducer consisted of 128 elements. The main objective of this work was to compare the applicability and effectiveness of the two techniques in aerospace composites inspection as well as to evaluate the accuracy produced regarding the quantitative characterisation of the detected features. The obtained results showed that all the defects were revealed by either transient thermography or ultrasonic testing, whilst thermographic inspection can display the acquired results in a more rapid manner. On the other hand UT testing can provide efficient results for deeper probing requiring however longer inspection times. In other words, the acquired data and the respective analyses highlighted the different capability of each testing configuration, to detect defects and to gain knowledge for the interior of the structures.

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“…According to Theodoros [5], ultrasonic inspection is considered as the most efficient method used for quality control and materials quality inspection to all major industries including aircraft industries. However, ultrasonic inspection technique is relatively slow in process compared to the image processing method especially in application of the large part products.…”

Section: Introductionmentioning

confidence: 99%

Flatbed scanner image and single ultrasonic rangefinder technique for composite laminates defect detection

Mahmod¹,

Pauzi²,

Bakar³

2013

2013 IEEE International Conference on Smart Instrumentation, Measurement and Applications (ICSIMA)

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Inspection of composite laminates in production line using Ultrasonic C-scan for NDT requires a competent and experience inspector in order to analyze the signal which involve various technical instruction. In this paper, two approaches had been used which are image based approach and signal based approach of ultrasonic C-Scan method for NDT of composite laminate are developed and applied, with the aim to compare and validate both techniques instead of surface defect percentage area. The idea is, to propose an image analysis technique which easy to handle by general worker either the defect percentage area between the image and signal analysis are acceptable range or not. Composite laminates 6 plies which produced in-house with geometry 280 mm length x 80 mm width x 2 mm thickness was drilled to consider as defect area. Then, further analysis was performed using image scanning and processing to calculate the percentage of the defect area before we proceeds to the ultrasonic signal based approach. This research had been successfully done with the maximum and the minimum yield percentage between image processing and ultrasonic signal based approach method are 17.12 percent and 8.52 percent.

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Application of Ultrasonic C-Scan Techniques for Tracing Defects in Laminated Composite Materials

Cited by 78 publications

References 7 publications

A feasibility study on different NDT techniques used for testing bond quality in cold roll bonded Al-Sn alloy/steel bimetal strips

A feasibility study on different NDT techniques used for testing bond quality in cold roll bonded Al-Sn alloy/steel bimetal strips

Comparative evaluation of aerospace composites using thermography and ultrasonic NDT techniques

Flatbed scanner image and single ultrasonic rangefinder technique for composite laminates defect detection

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