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www.bris.ac.uk/composites
CMTS (Continuous Multi-Tow Shearing)for High-Volume Production of Complex
Composite Parts
Evangelos Zympeloudis, Kevin Potter, Paul Weaver, B. C. Eric Kim
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CMTS: Continuous Multi Tow [email protected]
Tow Steering
[2] Coburn et al. 2015 [3] Chauncey Wu et al. 2009
[2] [3]
• Lay-up on complex doubly curved moulds
• Structural efficiency through variable-stiffness structures
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CMTS: Continuous Multi Tow [email protected]
Limitations of Current Technology
• In plane bending of tapes defects:
• Minimum Steering Radius– ATL: 6000 mm for 150 mm wide tape– AFP: 630 mm for 3.175 mm wide tow [4]
[4] M. H. Nagelsmit et al, 2013 [5] K. D. Potter, 2009
Fibre Buckling Width affects steering abilities[4] [5]
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CMTS: Continuous Multi Tow [email protected]
Continuous Tow Shearing (CTS)
• Minimum steering radius 30 mm for 8 mm wide tow
• Decoupling of width and minimum steering radius
[5]
CTSAFP/ATL
[6] B.C. Kim et al, 2014
[6]
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CMTS: Continuous Multi Tow [email protected]
Continuous Multi-Tow Shearing (CMTS)Tape laying machine capable of• High Quality steered laminates• High Production Rates. Compaction
Shoe
Pinch Device
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CMTS: Continuous Multi Tow [email protected]
Operation of CMTS Prototype
Steering Radius: 155 mmfor 90 mm wide tape
cf. ATL: 6000 mm for 150 mm wide tapeAFP: 630 mm for 3.175 mm wide tow
30 mm
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CMTS: Continuous Multi Tow [email protected]
Material Parameters affect Quality
0
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1.0
2.0
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4.0
5.0
6.0
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-230 -170 -110 -50 0 50 110 170 230
Per
cen
tag
e of
Res
in A
rea
(%)
X Position (mm)
Resin Pocket Areas vs PositionTows 1-10
Tows 11-30
Tows 31-40
Tows 31-40
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CMTS: Continuous Multi Tow [email protected]
Future Direction• Quality
– Characterization of different materials
– Identification of key requirements for the optimal material format
• Productivity– Detachable Shearing
mechanism– Operation mode of CMTS
• Mechanical Properties– Effect of shearing on
mechanical properties
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CMTS: Continuous Multi Tow [email protected]
Thank you for your Attention!
• Supported by:
• Supervisors:
– B.C. Eric Kim
– Paul Weaver
– Kevin Potter
