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Reshaping the testing pyramid: Utilisation of data-rich NDT techniques as a means to develop a 'high fidelity' component and sub-structure testing methodology for composites

Reshaping the testing pyramid: Utilisation of data-rich NDT techniques as a means to develop a 'high fidelity' component and sub-structure testing methodology for composites
Reshaping the testing pyramid: Utilisation of data-rich NDT techniques as a means to develop a 'high fidelity' component and sub-structure testing methodology for composites
A key issue in the certification of composite structures is the heavy reliance on ‘coupon level’ tests that do not always translate well to the sub-structure, component and full scale structural behaviour within a ‘building block’ or ‘testing pyramid’ framework. This has a strong bearing on the certification process as many of the design allowables and failure predictions are determined from the behaviour of coupon specimens. The overarching aim of this work is to develop an understanding into the behaviour of composites at the larger sub-component scales, which better represent the in-service behaviour of these structures, reducing the reliance on extensive coupon level testing. This requires non-destructive testing (NDT) methods that are scalable to large components. This study investigates the feasibilities of Thermoelastic Stress Analysis (TSA) and Digital Image Correlation (DIC) as scalable strain based NDT methods that provide full-field information to study the effects of defects on structural composite components. Both techniques are successfully demonstrated showing their capability for detecting the detrimental effects of fibre waviness (wrinkles) on a thick non-generic composite component. X-ray computed tomography (CT) is used to validate the observations made with the two strain based NDT techniques.
Composite structures, non-destructive testing, Thermoelastic stressanalysis (TSA), Digital image correlation, X-ray Computed Tomography
Bull, D.
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Barton, J.
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Thomsen, O.
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Butler, R.
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Rhead, A.T.
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Fletcher, A
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Potter, K.D.
e73c093e-40c2-4f4b-88ab-b20b15ec2b53
Bull, D.
3569ba02-89de-4398-a14d-02c3f9b4eab2
Barton, J.
9e35bebb-2185-4d16-a1bc-bb8f20e06632
Thomsen, O.
f3e60b22-a09f-4d58-90da-d58e37d68047
Butler, R.
e164104d-4531-46e6-8861-377e8502197e
Rhead, A.T.
82d9da63-c87d-445b-b215-ebabb93ae2de
Fletcher, A
c14ff2c3-bc15-4f9e-9077-98f54b2255a9
Potter, K.D.
e73c093e-40c2-4f4b-88ab-b20b15ec2b53

Bull, D., Barton, J., Thomsen, O., Butler, R., Rhead, A.T., Fletcher, A and Potter, K.D. (2017) Reshaping the testing pyramid: Utilisation of data-rich NDT techniques as a means to develop a 'high fidelity' component and sub-structure testing methodology for composites. In 21st International Conference on Composite Materials.

Record type: Conference or Workshop Item (Paper)

Abstract

A key issue in the certification of composite structures is the heavy reliance on ‘coupon level’ tests that do not always translate well to the sub-structure, component and full scale structural behaviour within a ‘building block’ or ‘testing pyramid’ framework. This has a strong bearing on the certification process as many of the design allowables and failure predictions are determined from the behaviour of coupon specimens. The overarching aim of this work is to develop an understanding into the behaviour of composites at the larger sub-component scales, which better represent the in-service behaviour of these structures, reducing the reliance on extensive coupon level testing. This requires non-destructive testing (NDT) methods that are scalable to large components. This study investigates the feasibilities of Thermoelastic Stress Analysis (TSA) and Digital Image Correlation (DIC) as scalable strain based NDT methods that provide full-field information to study the effects of defects on structural composite components. Both techniques are successfully demonstrated showing their capability for detecting the detrimental effects of fibre waviness (wrinkles) on a thick non-generic composite component. X-ray computed tomography (CT) is used to validate the observations made with the two strain based NDT techniques.

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ICCM21 - Reshaping the Testing Pyramid - Version of Record
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More information

Published date: 2017
Venue - Dates: 21st International Conference on Composite Materials, Xi’an, China, 2017-08-20 - 2017-08-25
Keywords: Composite structures, non-destructive testing, Thermoelastic stressanalysis (TSA), Digital image correlation, X-ray Computed Tomography

Identifiers

Local EPrints ID: 418529
URI: http://eprints.soton.ac.uk/id/eprint/418529
PURE UUID: ed3fb4c4-8b09-4976-8ea1-a019ec2d7d5a
ORCID for D. Bull: ORCID iD orcid.org/0000-0001-6711-6153

Catalogue record

Date deposited: 09 Mar 2018 17:31
Last modified: 20 Jul 2019 00:47

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