Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 163, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2022.107172
Keywords
D; Process monitoring; E; Consolidation; Prepreg processing; Pressure sensors
Funding
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/R513568/1, EP/S017038/1]
Ask authors/readers for more resources
This study investigates the consolidation of unidirectional carbon-epoxy prepreg layers during lay-up and oven vacuum bag moulding. The pressure measurements using flexible thin-film pressure sensors show that the excess pressure on external corners decreases during moulding, while internal corners experience ply-bridging and result in thickening and voids.
A total of eight corner pieces with the four different thickness-to-radius ratio, one set using external and one set using internal tooling, were made to identify how unidirectional carbon-epoxy prepreg layers consolidate during lay-up and oven vacuum bag moulding. Flexible thin-film pressure sensors were introduced to both internal and external corner mould surfaces and pressure measurements were taken during hand lay-up. A second sensor was added to monitor how the pressure gradient changes during oven vacuum bag moulding. Time-lapsed pressure measurements found that the geometry-induced excess pressure on the external corners decreases during moulding, leading to some corner thinning but this effect is small. Meanwhile, internal corner parts saw significant ply-bridging in high thickness-to-radius conditions that could not be resolved during consolidation, resulting in corner thickening and voids. The flexible sensors are a viable option for in-situ pressure monitoring for potential meso-structural defects during composite product development or manufacture.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available