Optical Detection of Void Formation Mechanisms during Impregnation of Composites by UV-Reactive Resin Systems
During the impregnation of reinforcement fabrics in liquid composite molding processes, the flow within fiber bundles and the channels between the fiber bundles usually advances at different velocities. This so-called “dual-scale flow” results in void formation inside the composite material and has...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Journal of Composites Science |
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| Online Access: | https://www.mdpi.com/2504-477X/6/11/351 |
| _version_ | 1797464893550493696 |
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| author | Benedikt Neitzel Florian Puch |
| author_facet | Benedikt Neitzel Florian Puch |
| author_sort | Benedikt Neitzel |
| collection | DOAJ |
| description | During the impregnation of reinforcement fabrics in liquid composite molding processes, the flow within fiber bundles and the channels between the fiber bundles usually advances at different velocities. This so-called “dual-scale flow” results in void formation inside the composite material and has a negative effect on its mechanical properties. Semi-empirical models can be applied to calculate the extent of the dual-scale flow. In this study, a methodology is presented that stops the impregnation of reinforcement fabrics at different filling levels by using a photo-reactive resin system. By means of optical evaluation, the theoretical calculation models of the dual-scale flow are validated metrologically. The results show increasingly distinct dual-scale flow effects with increasing pressure gradients. The methodology enables the measurability of microscopic differences in flow front progression to validate renowned theoretical models and compare simulations to measurements of applied injection processes. |
| first_indexed | 2024-03-09T18:14:36Z |
| format | Article |
| id | doaj.art-521ddeb5e9e34acb810e4ec63f4405f8 |
| institution | Directory Open Access Journal |
| issn | 2504-477X |
| language | English |
| last_indexed | 2024-03-09T18:14:36Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Composites Science |
| spelling | doaj.art-521ddeb5e9e34acb810e4ec63f4405f82023-11-24T08:51:43ZengMDPI AGJournal of Composites Science2504-477X2022-11-0161135110.3390/jcs6110351Optical Detection of Void Formation Mechanisms during Impregnation of Composites by UV-Reactive Resin SystemsBenedikt Neitzel0Florian Puch1Plastics Technology Group, Department of Mechanical Engineering, Technische Universität Ilmenau, 98693 Ilmenau, GermanyPlastics Technology Group, Department of Mechanical Engineering, Technische Universität Ilmenau, 98693 Ilmenau, GermanyDuring the impregnation of reinforcement fabrics in liquid composite molding processes, the flow within fiber bundles and the channels between the fiber bundles usually advances at different velocities. This so-called “dual-scale flow” results in void formation inside the composite material and has a negative effect on its mechanical properties. Semi-empirical models can be applied to calculate the extent of the dual-scale flow. In this study, a methodology is presented that stops the impregnation of reinforcement fabrics at different filling levels by using a photo-reactive resin system. By means of optical evaluation, the theoretical calculation models of the dual-scale flow are validated metrologically. The results show increasingly distinct dual-scale flow effects with increasing pressure gradients. The methodology enables the measurability of microscopic differences in flow front progression to validate renowned theoretical models and compare simulations to measurements of applied injection processes.https://www.mdpi.com/2504-477X/6/11/351void formationdual-scale flowpermeabilitytextile preformsliquid composite moldingfiber reinforced plastics |
| spellingShingle | Benedikt Neitzel Florian Puch Optical Detection of Void Formation Mechanisms during Impregnation of Composites by UV-Reactive Resin Systems Journal of Composites Science void formation dual-scale flow permeability textile preforms liquid composite molding fiber reinforced plastics |
| title | Optical Detection of Void Formation Mechanisms during Impregnation of Composites by UV-Reactive Resin Systems |
| title_full | Optical Detection of Void Formation Mechanisms during Impregnation of Composites by UV-Reactive Resin Systems |
| title_fullStr | Optical Detection of Void Formation Mechanisms during Impregnation of Composites by UV-Reactive Resin Systems |
| title_full_unstemmed | Optical Detection of Void Formation Mechanisms during Impregnation of Composites by UV-Reactive Resin Systems |
| title_short | Optical Detection of Void Formation Mechanisms during Impregnation of Composites by UV-Reactive Resin Systems |
| title_sort | optical detection of void formation mechanisms during impregnation of composites by uv reactive resin systems |
| topic | void formation dual-scale flow permeability textile preforms liquid composite molding fiber reinforced plastics |
| url | https://www.mdpi.com/2504-477X/6/11/351 |
| work_keys_str_mv | AT benediktneitzel opticaldetectionofvoidformationmechanismsduringimpregnationofcompositesbyuvreactiveresinsystems AT florianpuch opticaldetectionofvoidformationmechanismsduringimpregnationofcompositesbyuvreactiveresinsystems |