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manufacturing requires the development of optimized and robust processes, as well as more careful attention to protocols. The present study reveals some of the fundamental phenomena associated with low-pressure processing of corner laminates, and provides a basis for developing effective manufacturing guidelines. The existing literature suggests that size and complexity scale- up may also complicate other phenomena that govern quality, including air evacuation. Furthermore, such scale-up may also lead to non-ideal temperature and pressure distributions within the vacuum-bagged part. As a result, the insights developed here must be combined with further research on factors affecting prepreg compaction, and with the development of more accurate predictive simulations for compaction, cure, and microstructural quality. Acknowledgements This project is funded by the National Science Foundation G8 Research Project of Interdisciplinary Program on Material Efficiency, through the “Sustainable Manufacturing: Out-of- Autoclave Processing” project (CMMI-1229011). Cytec Industries generously donated the prepreg materials used in this study. Airtech International donated the consumables. The authors thank Garrett Peters, an undergraduate research assistant, for his sample analysis work and useful suggestions. Finally, the helpful contributions and suggestions of the G8 project’s academic partners and industrial advisory board are gratefully acknowledged. References 1. Campbell, F.C., Manufacturing technology for aerospace structural materials. Elsevier, 2011. 2. de Almeida, S.F.M., and Z.S.N. Neto, Effect of void content on the strength of composite laminates. Composite structures, 1994. 28(2): p. 139-148. 3. Bowles, K.J., and S. Frimpong, Void effects on the interlaminar shear strength of unidirectional graphite-fiber-reinforced composites. Journal of Composite Materials, 1992. 26(10): p. 1487-1509. 4. Centea, T, L.K. Grunenfelder, and S.R. Nutt, A review of out-of-autoclave prepregs–Material properties, process phenomena, and manufacturing considerations. Composites Part A: Applied Science and Manufacturing, 2015. 70: p. 132-154. DOI: 10.1002/pc.23773 23PDF Image | Vacuum Bag-Only Prepregs
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