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Detecting and characterising interfacial fracture through the face sheets of sandwich structures using mirror-assisted imaging techniques

Composite sandwich structures often have complicated geometry that limits optical access, which prevents deployment of full field imaging techniques, such as Digital Imaging Correlation (DIC) and Thermoelastic Stress Analysis (TSA). During testing, it is difficult to use traditional inspection approaches to internal regions where debonds may occur in the interfaces between the face sheets and core material. Here, mirrors are utilised to allow optical access to face sheets of sandwich specimens loaded in bending, so that TSA can be employed to characterise interfacial debonding through the face sheets. To separate the surface thermoelastic response, ΔT, from that generated from the interfacial regions, DIC is used to obtain the surface strains. From this, ΔT from the surface in the vicinity of a debond is estimated. The interface ΔT is then obtained by subtracting it from ΔT obtained from TSA. From this, the interfacial fracture process can be characterised.

7236.mp4 7236.mp3

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Universitat de Girona. Grup de Recerca en Anàlisi i Materials Avançats per al Disseny Estructural (AMADE)

Author: Leung, Hiu Ling
Date: 2023 May 31
Abstract: Composite sandwich structures often have complicated geometry that limits optical access, which prevents deployment of full field imaging techniques, such as Digital Imaging Correlation (DIC) and Thermoelastic Stress Analysis (TSA). During testing, it is difficult to use traditional inspection approaches to internal regions where debonds may occur in the interfaces between the face sheets and core material. Here, mirrors are utilised to allow optical access to face sheets of sandwich specimens loaded in bending, so that TSA can be employed to characterise interfacial debonding through the face sheets. To separate the surface thermoelastic response, ΔT, from that generated from the interfacial regions, DIC is used to obtain the surface strains. From this, ΔT from the surface in the vicinity of a debond is estimated. The interface ΔT is then obtained by subtracting it from ΔT obtained from TSA. From this, the interfacial fracture process can be characterised.
7236.mp4 7236.mp3
9
Format: audio/mpeg
video/mp4
Document access: http://hdl.handle.net/10256.1/7236
Language: eng
Publisher: Universitat de Girona. Grup de Recerca en Anàlisi i Materials Avançats per al Disseny Estructural (AMADE)
Collection: CompTest 2023
Rights: Attribution-NonCommercial-ShareAlike 4.0 International
Rights URI: http://creativecommons.org/licenses/by-nc-sa/4.0/
Subject: Assaigs de materials -- Congressos
Materials -- Testing -- Congresses
Resistència de materials -- Congressos
Strength of materials -- Congresses
Plàstics reforçats amb fibra de carboni -- Congressos
Carbon fiber-reinforced plastics -- Congresses
Mecànica de fractura -- Congressos
Fracture mechanics -- Congresses
Materials compostos -- Fractura -- Congressos
Composite materials -- Fracture -- Congresses
Materials laminats -- Congressos
Laminated materials -- Congresses
Title: Detecting and characterising interfacial fracture through the face sheets of sandwich structures using mirror-assisted imaging techniques
Type: info:eu-repo/semantics/lecture
Repository: DUGiMedia

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