Size-Independent Flexure Test Technique for the Mechanical Properties of Geocomposites Reinforced by Unidirectional Fibers
In assessing the bending attributes for geopolymer composites augmented with uni-directional fibers, methodologies aligned with the established American and European standards yield quantifiable values for flexural strength, denoted as <i>σ<sub>m</sub></i>*, and its correspon...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-10-01
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| Series: | Ceramics |
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| Online Access: | https://www.mdpi.com/2571-6131/6/4/126 |
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| author | Hung Tran Doan Dora Kroisova Oleg Bortnovsky |
| author_facet | Hung Tran Doan Dora Kroisova Oleg Bortnovsky |
| author_sort | Hung Tran Doan |
| collection | DOAJ |
| description | In assessing the bending attributes for geopolymer composites augmented with uni-directional fibers, methodologies aligned with the established American and European standards yield quantifiable values for flexural strength, denoted as <i>σ<sub>m</sub></i>*, and its corresponding elasticity modulus, <i>E</i>*. Notably, these values exhibit a pronounced dependency on the size of the testing parameters. Specifically, within a judicious range of support span <i>L</i> relative to specimen height <i>H</i>, spanning a ratio of 10 to 40, these metrics can vary by a factor between 2 and 4. By conducting evaluations across an extensive array of <i>H/L</i> ratios and adhering to the protocols set for comparable composites with a plastic matrix, it becomes feasible to determine the definitive flexural elastic modulus <i>E</i> and shear modulus <i>G</i>, both of which can be viewed as size-neutral material traits. A parallel methodology can be employed to deduce size-agnostic values for flexural strength, <i>σ<sub>m</sub></i>. The established linear relationship between the inverse practical value <i>E</i>* (<i>1/E</i>*) and the squared ratio <i>(H/L)</i><sup>2</sup> is acknowledged. However, a congruent <i>1/σ<sub>m</sub></i>* relationship has been recently corroborated experimentally, aligning primarily with Tarnopolsky’s theoretical propositions. The parameter <i>T</i>, defined as the inverse gradient of <i>1/σ<sub>m</sub></i>* about <i>(H/L)</i><sup>2</sup>, is integral to these findings. Furthermore, the significance of the loading displacement rate is underscored, necessitating a tailored consideration for different scenarios. |
| first_indexed | 2024-03-08T20:54:27Z |
| format | Article |
| id | doaj.art-21d6ca87f3414f2e96fdeac3e622eb29 |
| institution | Directory Open Access Journal |
| issn | 2571-6131 |
| language | English |
| last_indexed | 2024-03-08T20:54:27Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Ceramics |
| spelling | doaj.art-21d6ca87f3414f2e96fdeac3e622eb292023-12-22T13:59:50ZengMDPI AGCeramics2571-61312023-10-01642053206910.3390/ceramics6040126Size-Independent Flexure Test Technique for the Mechanical Properties of Geocomposites Reinforced by Unidirectional FibersHung Tran Doan0Dora Kroisova1Oleg Bortnovsky2Faculty of Mechanical Engineering, Nha Trang University, 02 Nguyen Dinh Chieu, Nha Trang 650000, VietnamFaculty of Mechanical Engineering, Technical University of Liberec, Studentská 2, 461 17 Liberec, Czech RepublicEuro Support Manufacturing Czechia, s.r.o. Záluží 1, 436 70 Litvínov, Czech RepublicIn assessing the bending attributes for geopolymer composites augmented with uni-directional fibers, methodologies aligned with the established American and European standards yield quantifiable values for flexural strength, denoted as <i>σ<sub>m</sub></i>*, and its corresponding elasticity modulus, <i>E</i>*. Notably, these values exhibit a pronounced dependency on the size of the testing parameters. Specifically, within a judicious range of support span <i>L</i> relative to specimen height <i>H</i>, spanning a ratio of 10 to 40, these metrics can vary by a factor between 2 and 4. By conducting evaluations across an extensive array of <i>H/L</i> ratios and adhering to the protocols set for comparable composites with a plastic matrix, it becomes feasible to determine the definitive flexural elastic modulus <i>E</i> and shear modulus <i>G</i>, both of which can be viewed as size-neutral material traits. A parallel methodology can be employed to deduce size-agnostic values for flexural strength, <i>σ<sub>m</sub></i>. The established linear relationship between the inverse practical value <i>E</i>* (<i>1/E</i>*) and the squared ratio <i>(H/L)</i><sup>2</sup> is acknowledged. However, a congruent <i>1/σ<sub>m</sub></i>* relationship has been recently corroborated experimentally, aligning primarily with Tarnopolsky’s theoretical propositions. The parameter <i>T</i>, defined as the inverse gradient of <i>1/σ<sub>m</sub></i>* about <i>(H/L)</i><sup>2</sup>, is integral to these findings. Furthermore, the significance of the loading displacement rate is underscored, necessitating a tailored consideration for different scenarios.https://www.mdpi.com/2571-6131/6/4/126geocompositeunidirectional fiberssize-independentflexural properties |
| spellingShingle | Hung Tran Doan Dora Kroisova Oleg Bortnovsky Size-Independent Flexure Test Technique for the Mechanical Properties of Geocomposites Reinforced by Unidirectional Fibers Ceramics geocomposite unidirectional fibers size-independent flexural properties |
| title | Size-Independent Flexure Test Technique for the Mechanical Properties of Geocomposites Reinforced by Unidirectional Fibers |
| title_full | Size-Independent Flexure Test Technique for the Mechanical Properties of Geocomposites Reinforced by Unidirectional Fibers |
| title_fullStr | Size-Independent Flexure Test Technique for the Mechanical Properties of Geocomposites Reinforced by Unidirectional Fibers |
| title_full_unstemmed | Size-Independent Flexure Test Technique for the Mechanical Properties of Geocomposites Reinforced by Unidirectional Fibers |
| title_short | Size-Independent Flexure Test Technique for the Mechanical Properties of Geocomposites Reinforced by Unidirectional Fibers |
| title_sort | size independent flexure test technique for the mechanical properties of geocomposites reinforced by unidirectional fibers |
| topic | geocomposite unidirectional fibers size-independent flexural properties |
| url | https://www.mdpi.com/2571-6131/6/4/126 |
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