The Unstable Fracture of Multifilament Tows
The present paper investigates the unexpected unstable failure observed commonly on fiber tows tensile-tested under strain-controlled loading, although the force on the fibers should theoretically be relaxed under controlled strain. A model of the reaction of the load train when the fibers break und...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-01-01
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| Series: | Journal of Composites Science |
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| Online Access: | https://www.mdpi.com/2504-477X/8/2/52 |
| _version_ | 1797297815475453952 |
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| author | Jacques Lamon |
| author_facet | Jacques Lamon |
| author_sort | Jacques Lamon |
| collection | DOAJ |
| description | The present paper investigates the unexpected unstable failure observed commonly on fiber tows tensile-tested under strain-controlled loading, although the force on the fibers should theoretically be relaxed under controlled strain. A model of the reaction of the load train when the fibers break under strain-controlled conditions is proposed. The criterion for instability is based on the comparison of the filament strength gradient and the overstress induced by the reaction of the load train when the fibers fail. The contribution of multiplet filament failures attributed to the fiber inter-friction and stress waves was taken into account. The compliance of the load train for the test results considered in the present paper was measured. It is shown that, depending on the number of filaments sharing the overload, the values of the structural parameters, and the fiber characteristics, the condition of unstable failure may have been fulfilled by the SiC fiber tows that were tested in house, as discussed in the present paper. The critical parameters that were identified and quantified include the load train compliance, gauge length, fiber stiffness, and bonding of the tow ends. This should allow the proper conditions for stable failure. Important implications for the validity and an analysis of the strengths derived from the unstable fracture of the tows are discussed. |
| first_indexed | 2024-03-07T22:26:47Z |
| format | Article |
| id | doaj.art-8bce89acd4c4419eb5d74743aad7605e |
| institution | Directory Open Access Journal |
| issn | 2504-477X |
| language | English |
| last_indexed | 2024-03-07T22:26:47Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Composites Science |
| spelling | doaj.art-8bce89acd4c4419eb5d74743aad7605e2024-02-23T15:22:34ZengMDPI AGJournal of Composites Science2504-477X2024-01-01825210.3390/jcs8020052The Unstable Fracture of Multifilament TowsJacques Lamon0LMPS-ENS, Université Paris-Saclay, 4, Avenue des Sciences, CS 30008, 91192 Gif-sur-Yvette, FranceThe present paper investigates the unexpected unstable failure observed commonly on fiber tows tensile-tested under strain-controlled loading, although the force on the fibers should theoretically be relaxed under controlled strain. A model of the reaction of the load train when the fibers break under strain-controlled conditions is proposed. The criterion for instability is based on the comparison of the filament strength gradient and the overstress induced by the reaction of the load train when the fibers fail. The contribution of multiplet filament failures attributed to the fiber inter-friction and stress waves was taken into account. The compliance of the load train for the test results considered in the present paper was measured. It is shown that, depending on the number of filaments sharing the overload, the values of the structural parameters, and the fiber characteristics, the condition of unstable failure may have been fulfilled by the SiC fiber tows that were tested in house, as discussed in the present paper. The critical parameters that were identified and quantified include the load train compliance, gauge length, fiber stiffness, and bonding of the tow ends. This should allow the proper conditions for stable failure. Important implications for the validity and an analysis of the strengths derived from the unstable fracture of the tows are discussed.https://www.mdpi.com/2504-477X/8/2/52fiberstowsfracturestrength |
| spellingShingle | Jacques Lamon The Unstable Fracture of Multifilament Tows Journal of Composites Science fibers tows fracture strength |
| title | The Unstable Fracture of Multifilament Tows |
| title_full | The Unstable Fracture of Multifilament Tows |
| title_fullStr | The Unstable Fracture of Multifilament Tows |
| title_full_unstemmed | The Unstable Fracture of Multifilament Tows |
| title_short | The Unstable Fracture of Multifilament Tows |
| title_sort | unstable fracture of multifilament tows |
| topic | fibers tows fracture strength |
| url | https://www.mdpi.com/2504-477X/8/2/52 |
| work_keys_str_mv | AT jacqueslamon theunstablefractureofmultifilamenttows AT jacqueslamon unstablefractureofmultifilamenttows |