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

Pedro Ochôa; Irene Fernandez Villegas; Roger M. Groves; Rinze Benedictus

doi:10.1016/j.ndteint.2019.102126

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

Pedro Ochôa^*, Irene Fernandez Villegas, Roger M. Groves, Rinze Benedictus

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

23 Citations (Scopus)

33 Downloads (Pure)

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.

Original language	English
Article number	102126
Number of pages	10
Journal	NDT and E International
Volume	107
DOIs	https://doi.org/10.1016/j.ndteint.2019.102126
Publication status	Published - 2019

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

Manufacturing defects
Structural health monitoring
Thermoplastic composite
Ultrasonic guided waves
Ultrasonic welding

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10.1016/j.ndteint.2019.102126

1-s2.0-S0963869518306017-main-1Final published version, 2.58 MB

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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 = "Green Open Access added to TU Delft Institutional Repository {\textquoteleft}You share, we take care!{\textquoteright} – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. ",

year = "2019",

doi = "10.1016/j.ndteint.2019.102126",

language = "English",

volume = "107",

journal = "NDT and E International",

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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 - Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

PY - 2019

Y1 - 2019

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

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U2 - 10.1016/j.ndteint.2019.102126

DO - 10.1016/j.ndteint.2019.102126

M3 - Article

AN - SCOPUS:85066947053

SN - 0963-8695

VL - 107

JO - NDT and E International

JF - NDT and E International

M1 - 102126

ER -

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

Abstract

Bibliographical note

Keywords

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Supporting data for Guided wave and mechanical testing of defective thermoplastic composite ultrasonic welds

Cite this

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

Abstract

Bibliographical note

Keywords

Access to Document

Other files and links

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Datasets

Supporting data for Guided wave and mechanical testing of defective thermoplastic composite ultrasonic welds

Cite this