Reveal of Internal, Early-Load Interfacial Debonding on Cement Textile-Reinforced Sandwich Insulated Panels
Internal interfacial debonding (IID) phenomena on sandwich façade insulated panels are detected and tracked by acoustic emission (AE). The panels are made of a thin and lightweight cementitious composite skin. In the lab, the panels are tested under incremental bending simulating service loads (i.e....
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| Format: | Article |
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MDPI AG
2021-01-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/2/879 |
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| author | Eleni Tsangouri Hasan Ismail Matthias De Munck Dimitrios G. Aggelis Tine Tysmans |
| author_facet | Eleni Tsangouri Hasan Ismail Matthias De Munck Dimitrios G. Aggelis Tine Tysmans |
| author_sort | Eleni Tsangouri |
| collection | DOAJ |
| description | Internal interfacial debonding (IID) phenomena on sandwich façade insulated panels are detected and tracked by acoustic emission (AE). The panels are made of a thin and lightweight cementitious composite skin. In the lab, the panels are tested under incremental bending simulating service loads (i.e., wind). Local (up to 150 mm wide) skin-core detachments are reported in the early loading stage (at 5% of ultimate load) and are extensively investigated in this study, since IID can detrimentally affect the long-term durability of the structural element. A sudden rise in the AE hits rate and a shift in the wave features (i.e., absolute energy, amplitude, rise time) trends indicate the debonding onset. AE source localization, validated by digital image correlation (DIC) principal strains and out-of-plane full-field displacement mapping, proves that early debonding occurs instantly and leads to the onset of cracks in the cementitious skin. At higher load levels, cracking is accompanied by local debonding phenomena, as proven by RA value increases and average frequency drops, a result that extends the state-of-the-art in the fracture assessment of concrete structures (Rilem Technical Committee 212-ACD). Point (LVDT) and full-field (AE/DIC) measurements highlight the need for a continuous and full-field monitoring methodology in order to pinpoint the debonded zones, with the DIC technique accurately reporting surface phenomena while AE offers in-volume damage tracking. |
| first_indexed | 2024-03-09T04:20:44Z |
| format | Article |
| id | doaj.art-347585f9f63a4df29bdad96b94637a9b |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T04:20:44Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-347585f9f63a4df29bdad96b94637a9b2023-12-03T13:47:26ZengMDPI AGApplied Sciences2076-34172021-01-0111287910.3390/app11020879Reveal of Internal, Early-Load Interfacial Debonding on Cement Textile-Reinforced Sandwich Insulated PanelsEleni Tsangouri0Hasan Ismail1Matthias De Munck2Dimitrios G. Aggelis3Tine Tysmans4Department Mechanics of Materials and Constructions (MeMC), Vrije Universiteit Brussel (VUB), 1050 Ixelles, BelgiumDepartment Mechanics of Materials and Constructions (MeMC), Vrije Universiteit Brussel (VUB), 1050 Ixelles, BelgiumDepartment Mechanics of Materials and Constructions (MeMC), Vrije Universiteit Brussel (VUB), 1050 Ixelles, BelgiumDepartment Mechanics of Materials and Constructions (MeMC), Vrije Universiteit Brussel (VUB), 1050 Ixelles, BelgiumDepartment Mechanics of Materials and Constructions (MeMC), Vrije Universiteit Brussel (VUB), 1050 Ixelles, BelgiumInternal interfacial debonding (IID) phenomena on sandwich façade insulated panels are detected and tracked by acoustic emission (AE). The panels are made of a thin and lightweight cementitious composite skin. In the lab, the panels are tested under incremental bending simulating service loads (i.e., wind). Local (up to 150 mm wide) skin-core detachments are reported in the early loading stage (at 5% of ultimate load) and are extensively investigated in this study, since IID can detrimentally affect the long-term durability of the structural element. A sudden rise in the AE hits rate and a shift in the wave features (i.e., absolute energy, amplitude, rise time) trends indicate the debonding onset. AE source localization, validated by digital image correlation (DIC) principal strains and out-of-plane full-field displacement mapping, proves that early debonding occurs instantly and leads to the onset of cracks in the cementitious skin. At higher load levels, cracking is accompanied by local debonding phenomena, as proven by RA value increases and average frequency drops, a result that extends the state-of-the-art in the fracture assessment of concrete structures (Rilem Technical Committee 212-ACD). Point (LVDT) and full-field (AE/DIC) measurements highlight the need for a continuous and full-field monitoring methodology in order to pinpoint the debonded zones, with the DIC technique accurately reporting surface phenomena while AE offers in-volume damage tracking.https://www.mdpi.com/2076-3417/11/2/879sandwich-insulated panelinterfacial debondingcementitious compositeinsulationfractureacoustic emission |
| spellingShingle | Eleni Tsangouri Hasan Ismail Matthias De Munck Dimitrios G. Aggelis Tine Tysmans Reveal of Internal, Early-Load Interfacial Debonding on Cement Textile-Reinforced Sandwich Insulated Panels Applied Sciences sandwich-insulated panel interfacial debonding cementitious composite insulation fracture acoustic emission |
| title | Reveal of Internal, Early-Load Interfacial Debonding on Cement Textile-Reinforced Sandwich Insulated Panels |
| title_full | Reveal of Internal, Early-Load Interfacial Debonding on Cement Textile-Reinforced Sandwich Insulated Panels |
| title_fullStr | Reveal of Internal, Early-Load Interfacial Debonding on Cement Textile-Reinforced Sandwich Insulated Panels |
| title_full_unstemmed | Reveal of Internal, Early-Load Interfacial Debonding on Cement Textile-Reinforced Sandwich Insulated Panels |
| title_short | Reveal of Internal, Early-Load Interfacial Debonding on Cement Textile-Reinforced Sandwich Insulated Panels |
| title_sort | reveal of internal early load interfacial debonding on cement textile reinforced sandwich insulated panels |
| topic | sandwich-insulated panel interfacial debonding cementitious composite insulation fracture acoustic emission |
| url | https://www.mdpi.com/2076-3417/11/2/879 |
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