Fracture properties of thin brittle MTM clay coating on ductile HEC polymer substrate
Thin clay coatings can be deposited from water dispersions for the purpose of improved gas barrier properties and fire retardancy of polymeric materials. Mechanical properties of the coatings are difficult to assess, since they are very thin (≈1µm). In-situ tests using a micro tensile stage in a sca...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-06-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127523003623 |
| _version_ | 1797807218800721920 |
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| author | Marcus Vinícius Tavares da Costa Lengwan Li Lars A. Berglund |
| author_facet | Marcus Vinícius Tavares da Costa Lengwan Li Lars A. Berglund |
| author_sort | Marcus Vinícius Tavares da Costa |
| collection | DOAJ |
| description | Thin clay coatings can be deposited from water dispersions for the purpose of improved gas barrier properties and fire retardancy of polymeric materials. Mechanical properties of the coatings are difficult to assess, since they are very thin (≈1µm). In-situ tests using a micro tensile stage in a scanning electron microscope reveal a thickness-dependent microcracking mechanism, and Weibull parameters for coating fracture are extracted. Complex fracture events are identified, related to a weak clay coating-polymer substrate interface. A micromechanical finite element formulation provides values of 5 MPa for interfacial shear strength and 1 J/m2 for interfacial fracture toughness. From the multiple cracking behavior of the clay coating, a clay strength ≈ 225 MPa is estimated by the Weibull strength parameter from fragmentation diagrams. The method may be extended to other combinations of brittle coating-ductile substrates. |
| first_indexed | 2024-03-13T06:19:16Z |
| format | Article |
| id | doaj.art-03a863ef832b4249abcb80fe8abf235a |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-03-13T06:19:16Z |
| publishDate | 2023-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-03a863ef832b4249abcb80fe8abf235a2023-06-10T04:26:55ZengElsevierMaterials & Design0264-12752023-06-01230111947Fracture properties of thin brittle MTM clay coating on ductile HEC polymer substrateMarcus Vinícius Tavares da Costa0Lengwan Li1Lars A. Berglund2Corresponding author.; Royal Institute of Technology (KTH), Department of Fibre and Polymer Technology, Division of Biocomposites, SE-100 44 Stockholm, SwedenRoyal Institute of Technology (KTH), Department of Fibre and Polymer Technology, Division of Biocomposites, SE-100 44 Stockholm, SwedenRoyal Institute of Technology (KTH), Department of Fibre and Polymer Technology, Division of Biocomposites, SE-100 44 Stockholm, SwedenThin clay coatings can be deposited from water dispersions for the purpose of improved gas barrier properties and fire retardancy of polymeric materials. Mechanical properties of the coatings are difficult to assess, since they are very thin (≈1µm). In-situ tests using a micro tensile stage in a scanning electron microscope reveal a thickness-dependent microcracking mechanism, and Weibull parameters for coating fracture are extracted. Complex fracture events are identified, related to a weak clay coating-polymer substrate interface. A micromechanical finite element formulation provides values of 5 MPa for interfacial shear strength and 1 J/m2 for interfacial fracture toughness. From the multiple cracking behavior of the clay coating, a clay strength ≈ 225 MPa is estimated by the Weibull strength parameter from fragmentation diagrams. The method may be extended to other combinations of brittle coating-ductile substrates.http://www.sciencedirect.com/science/article/pii/S0264127523003623InterfaceIn-situ testFragmentation testMicrocrackingDebondingMTM tensile strength |
| spellingShingle | Marcus Vinícius Tavares da Costa Lengwan Li Lars A. Berglund Fracture properties of thin brittle MTM clay coating on ductile HEC polymer substrate Materials & Design Interface In-situ test Fragmentation test Microcracking Debonding MTM tensile strength |
| title | Fracture properties of thin brittle MTM clay coating on ductile HEC polymer substrate |
| title_full | Fracture properties of thin brittle MTM clay coating on ductile HEC polymer substrate |
| title_fullStr | Fracture properties of thin brittle MTM clay coating on ductile HEC polymer substrate |
| title_full_unstemmed | Fracture properties of thin brittle MTM clay coating on ductile HEC polymer substrate |
| title_short | Fracture properties of thin brittle MTM clay coating on ductile HEC polymer substrate |
| title_sort | fracture properties of thin brittle mtm clay coating on ductile hec polymer substrate |
| topic | Interface In-situ test Fragmentation test Microcracking Debonding MTM tensile strength |
| url | http://www.sciencedirect.com/science/article/pii/S0264127523003623 |
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