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Diagnostic of manufacturing defects in ultrasonically welded thermoplastic composite joints using ultrasonic guided waves. / Ochôa, Pedro; Villegas, Irene Fernandez; Groves, Roger M.; Benedictus, Rinze.

In: NDT and E International, Vol. 107, 102126, 01.10.2019.

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@article{980bd084e5a747b582226dde031fd96a,
title = "Diagnostic of manufacturing defects in ultrasonically welded thermoplastic composite joints using ultrasonic guided waves",
abstract = "This article presents research about the propagation of ultrasonic guided waves in ultrasonically welded thermoplastic composite joints. The goal of the study was to understand the effect of weld manufacturing defects on guided wave transmission across the joint. Triangular energy-directors integrated into the lower composite adherends enabled the production of defective joints in a controlled manner. The produced defect types were unwelded areas and adherend fibre bundle distortion. The reference condition corresponded to the fully welded stage which showed the highest single-lap shear strength. It was possible to detect adherend fibre bundle distortion through the increase in the negative shift of the signal characteristic frequency. Evidence of the presence of unwelded areas was found in the increase of Time-of-Flight of the maximum amplitude Lamb wave group. The sensitivity of the diagnostic parameters was found to be dependent on the ultrasonic guided wave excitation frequency.",
keywords = "Manufacturing defects, Structural health monitoring, Thermoplastic composite, Ultrasonic guided waves, Ultrasonic welding",
author = "Pedro Och{\^o}a and Villegas, {Irene Fernandez} and Groves, {Roger M.} and Rinze Benedictus",
note = "Accepted Author Manuscript",
year = "2019",
month = oct,
day = "1",
doi = "10.1016/j.ndteint.2019.102126",
language = "English",
volume = "107",
journal = "NDT&E International",
issn = "0963-8695",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Diagnostic of manufacturing defects in ultrasonically welded thermoplastic composite joints using ultrasonic guided waves

AU - Ochôa, Pedro

AU - Villegas, Irene Fernandez

AU - Groves, Roger M.

AU - Benedictus, Rinze

N1 - Accepted Author Manuscript

PY - 2019/10/1

Y1 - 2019/10/1

N2 - This article presents research about the propagation of ultrasonic guided waves in ultrasonically welded thermoplastic composite joints. The goal of the study was to understand the effect of weld manufacturing defects on guided wave transmission across the joint. Triangular energy-directors integrated into the lower composite adherends enabled the production of defective joints in a controlled manner. The produced defect types were unwelded areas and adherend fibre bundle distortion. The reference condition corresponded to the fully welded stage which showed the highest single-lap shear strength. It was possible to detect adherend fibre bundle distortion through the increase in the negative shift of the signal characteristic frequency. Evidence of the presence of unwelded areas was found in the increase of Time-of-Flight of the maximum amplitude Lamb wave group. The sensitivity of the diagnostic parameters was found to be dependent on the ultrasonic guided wave excitation frequency.

AB - This article presents research about the propagation of ultrasonic guided waves in ultrasonically welded thermoplastic composite joints. The goal of the study was to understand the effect of weld manufacturing defects on guided wave transmission across the joint. Triangular energy-directors integrated into the lower composite adherends enabled the production of defective joints in a controlled manner. The produced defect types were unwelded areas and adherend fibre bundle distortion. The reference condition corresponded to the fully welded stage which showed the highest single-lap shear strength. It was possible to detect adherend fibre bundle distortion through the increase in the negative shift of the signal characteristic frequency. Evidence of the presence of unwelded areas was found in the increase of Time-of-Flight of the maximum amplitude Lamb wave group. The sensitivity of the diagnostic parameters was found to be dependent on the ultrasonic guided wave excitation frequency.

KW - Manufacturing defects

KW - Structural health monitoring

KW - Thermoplastic composite

KW - Ultrasonic guided waves

KW - Ultrasonic welding

UR - http://www.scopus.com/inward/record.url?scp=85066947053&partnerID=8YFLogxK

U2 - 10.1016/j.ndteint.2019.102126

DO - 10.1016/j.ndteint.2019.102126

M3 - Article

AN - SCOPUS:85066947053

VL - 107

JO - NDT&E International

JF - NDT&E International

SN - 0963-8695

M1 - 102126

ER -

ID: 54762288