Failure analysis of GFRP single lap joints tailored with a combination of tough epoxy and hyperelastic adhesives
Fibre reinforced polymeric composites bonded with epoxy adhesives often fail ungraciously, manifesting fibre-tear failure due to the edge peel stresses. This research work proposes phenol formaldehyde-based hyperelastic adhesive (AF32), as a compliant adhesive for tailoring the single lap joints con...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Online Access: | https://hdl.handle.net/10356/144119 |
| _version_ | 1811676522888560640 |
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| author | Srinivasan, Dharun Vadugappatty Ravichandran, Vignesh Idapalapati, Sridhar |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Srinivasan, Dharun Vadugappatty Ravichandran, Vignesh Idapalapati, Sridhar |
| author_sort | Srinivasan, Dharun Vadugappatty |
| collection | NTU |
| description | Fibre reinforced polymeric composites bonded with epoxy adhesives often fail ungraciously, manifesting fibre-tear failure due to the edge peel stresses. This research work proposes phenol formaldehyde-based hyperelastic adhesive (AF32), as a compliant adhesive for tailoring the single lap joints consisting of GFRP adherends and well-toughened epoxy adhesive (AF3109 and EA9696) joints. The failure strength of the AF3109 and EA9696 adhesive joints is increased by 51.64% and 24.25%, respectively by having 20% volume of compliant adhesive in the bond line. Finite element simulations with Exponential Drucker-Prager (EDP) and Marlow strain energy models are carried out to simulate the experimental load-displacement response. Different failure mechanisms and the influence of adhesive intermingling are revealed by the failure analysis. Finally, a failure mode map for the tailored adhesive joints is proposed in terms of normalised strength ratio and the normalised volume of the compliant adhesive. |
| first_indexed | 2024-10-01T02:22:49Z |
| format | Journal Article |
| id | ntu-10356/144119 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:22:49Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1441192021-02-05T07:38:30Z Failure analysis of GFRP single lap joints tailored with a combination of tough epoxy and hyperelastic adhesives Srinivasan, Dharun Vadugappatty Ravichandran, Vignesh Idapalapati, Sridhar School of Mechanical and Aerospace Engineering Energy Research Institute @ NTU (ERI@N) Engineering::Materials::Composite materials Engineering::Manufacturing::Polymers and plastics Tailoring; Adhesion; Strength; Finite element analysis; Joints Fibre reinforced polymeric composites bonded with epoxy adhesives often fail ungraciously, manifesting fibre-tear failure due to the edge peel stresses. This research work proposes phenol formaldehyde-based hyperelastic adhesive (AF32), as a compliant adhesive for tailoring the single lap joints consisting of GFRP adherends and well-toughened epoxy adhesive (AF3109 and EA9696) joints. The failure strength of the AF3109 and EA9696 adhesive joints is increased by 51.64% and 24.25%, respectively by having 20% volume of compliant adhesive in the bond line. Finite element simulations with Exponential Drucker-Prager (EDP) and Marlow strain energy models are carried out to simulate the experimental load-displacement response. Different failure mechanisms and the influence of adhesive intermingling are revealed by the failure analysis. Finally, a failure mode map for the tailored adhesive joints is proposed in terms of normalised strength ratio and the normalised volume of the compliant adhesive. Agency for Science, Technology and Research (A*STAR) Economic Development Board (EDB) Nanyang Technological University National Research Foundation (NRF) Accepted version This work was conducted within the Rolls-Royce@NTU Corporate Lab under the project “ARMS 1.3 Repair of Composite Aero-engine Structures” with support from the Industry Alignment Fund (IAF) Singapore under the Corp Lab@University Scheme. Further Dr. S. Idapalapati thanks the financial support from MAE Research Incentive Grant. 2020-10-14T02:43:57Z 2020-10-14T02:43:57Z 2020 Journal Article Srinivasan, D. V., Ravichandran, V., & Idapalapati, S. (2020). Failure analysis of GFRP single lap joints tailored with a combination of tough epoxy and hyperelastic adhesives. Composites Part B: Engineering, 200, 108255-. doi:10.1016/j.compositesb.2020.108255 1359-8368 https://hdl.handle.net/10356/144119 10.1016/j.compositesb.2020.108255 200 108255 en Composites Part B: Engineering © 2020 Elsevier. All rights reserved. This paper was published in Composites Part B: Engineering and is made available with permission of Elsevier. application/pdf application/pdf |
| spellingShingle | Engineering::Materials::Composite materials Engineering::Manufacturing::Polymers and plastics Tailoring; Adhesion; Strength; Finite element analysis; Joints Srinivasan, Dharun Vadugappatty Ravichandran, Vignesh Idapalapati, Sridhar Failure analysis of GFRP single lap joints tailored with a combination of tough epoxy and hyperelastic adhesives |
| title | Failure analysis of GFRP single lap joints tailored with a combination of tough epoxy and hyperelastic adhesives |
| title_full | Failure analysis of GFRP single lap joints tailored with a combination of tough epoxy and hyperelastic adhesives |
| title_fullStr | Failure analysis of GFRP single lap joints tailored with a combination of tough epoxy and hyperelastic adhesives |
| title_full_unstemmed | Failure analysis of GFRP single lap joints tailored with a combination of tough epoxy and hyperelastic adhesives |
| title_short | Failure analysis of GFRP single lap joints tailored with a combination of tough epoxy and hyperelastic adhesives |
| title_sort | failure analysis of gfrp single lap joints tailored with a combination of tough epoxy and hyperelastic adhesives |
| topic | Engineering::Materials::Composite materials Engineering::Manufacturing::Polymers and plastics Tailoring; Adhesion; Strength; Finite element analysis; Joints |
| url | https://hdl.handle.net/10356/144119 |
| work_keys_str_mv | AT srinivasandharunvadugappatty failureanalysisofgfrpsinglelapjointstailoredwithacombinationoftoughepoxyandhyperelasticadhesives AT ravichandranvignesh failureanalysisofgfrpsinglelapjointstailoredwithacombinationoftoughepoxyandhyperelasticadhesives AT idapalapatisridhar failureanalysisofgfrpsinglelapjointstailoredwithacombinationoftoughepoxyandhyperelasticadhesives |