Experimental study of void evolution in partially impregnated prepregs
| Autor: | Mohammad Mohseni, Göran Fernlund, Navid Zobeiry, Leyla Farhang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Void (astronomy)
Materials science Mechanical Engineering Composite number 02 engineering and technology 021001 nanoscience & nanotechnology 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Materials Chemistry Ceramics and Composites Composite material 0210 nano-technology Porosity |
| Zdroj: | Journal of Composite Materials. 54:1511-1523 |
| ISSN: | 1530-793X 0021-9983 |
| Popis: | Controlling voids to minimize the final porosity level is an important concern when processing advanced composite structures. In this study, the porosity evolution during processing of partially impregnated prepregs is investigated using interrupted cure cycles and optical microscopy. Laminates made of MTM 45-1/5HS carbon/epoxy prepreg subjected to different cure cycles, bagging conditions, and humidity levels were studied. Fiber tow geometry and gas permeability were measured to determine the amount of compaction and the interconnectivity of unsaturated zones in the laminates. Three types of voids were identified: inter-laminar, fiber tow and resin voids, all with different origins and evolution patterns. It is shown that gas transport (both in-plane and through-thickness), fiber bed compaction, and resin infiltration govern void evolution during processing. The results provide insights for development of representative transport models and to optimize processing cycles. |
| Databáze: | OpenAIRE |
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