Investigation of CFRP prepreg tack for the first ply in automated fiber placement process
Automated fiber placement process is a fast growing technique to manufacture aircraft structures with low material wastage, increased productivity and higher quality compared to hand layup. To meet the demands of increased productivity by using a multi mould tool and for better accessibility, the...
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| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2016
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/68661 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Automated fiber placement process is a fast growing technique to manufacture
aircraft structures with low material wastage, increased productivity and higher
quality compared to hand layup. To meet the demands of increased productivity by
using a multi mould tool and for better accessibility, the robot-based fiber
placement units lay up the prepreg material on a vertically upright tool. However
there is a risk that the prepreg starts slipping from the mould surface due to gravity
if there is insufficient tack between the mould surface and first ply. This does not
allow further placement of prepreg material. The bond strength between the tool
and the first ply of the prepreg material must therefore be able to keep the prepreg
intact to the metal mould surface. Furthermore it should withstand the entire weight
of the subsequent prepreg layers laid on it. The influence of process parameters like
compaction pressure, temperature and layup speed to make the first ply adhere to
mould surface needs to be analysed. |
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