Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 143, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2021.106286
Keywords
AFP; Thermoplastics; Crystallinity; Automated manufacturing
Funding
- German Federal Ministry of Defence
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This study investigates the sensitivity of CF-PPS thermoplastic composite material to automated fibre placement process parameters, including the impact of surface temperature of the layup tool and tempering post-manufacturing. Secondary crystallinity can be produced by exposing the material to temperatures above the cold crystallisation temperature, with significant improvements in inter-laminar shear and tensile properties observed in laminates produced using heated tools. Tempering samples can increase the polymer tensile strength by up to 32%.
This study presents an investigation into the sensitivity of CF-PPS thermoplastic composite material to automated fibre placement process parameters: specifically the surface temperature of the layup tool and the addition of simple tempering post-manufacturing. The impact of both are investigated using DSC and mechanical tests, with a thermal analysis of the as-delivered material acting as a reference. Reference material measurements show that secondary crystallinity can be produced by exposing the material to temperatures above the cold (heating) crystallisation temperature. This secondary crystallinity begins to dominate the polymer-inherent crystallinity as the tempering conditions begin to approach the material melting temperature. At the maximum temperature tested (260 degrees C), secondary crystallinity accounts for over 70% of the total. Laminates produced using heated tools show a significant increase in both inter-laminar shear and perpendicular tensile properties with increasing temperature. Additionally, tempering samples is able to increase the polymer tensile strength by up to 32%.
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