Abstract
This work presents manufacturing of glass/polypropylene commingled yarns and analysis of low velocity impact (15J, 25J, and 35J) and compression after impact (CAI) performance of thermoset and thermoplastic composites produced from the hybrid commingled yarns. Hybrid commingled yarns were produced through an air jet nozzle at different air pressures. Results showed that commingled yarn tenacity and mixture quality were highly affected by changing the air pressures. Impact tests indicated that thermoplastic composites absorbed around 73-80% of the impact energy while thermoset composites absorbed 39-41%. CAI tests presented that thermoplastic composite had higher residual strength with a different failure mechanism under compressive loading.
Highlights
There is an increasing trend to use thermoplastic composites due to their high damage tolerance, energy absorption capability and strain rates compared to thermoset composites [1, 2]
Results showed that optimum process parameters should be decided in order to avoid fibre breakages and better mixing quality
Impact test results showed that thermoplastic composites absorbed more energy than the thermoset composites due to their plastic deformation and highly extension during impact loading
Summary
There is an increasing trend to use thermoplastic composites due to their high damage tolerance, energy absorption capability and strain rates compared to thermoset composites [1, 2]. Using hybrid-commingled yarns is one of the methods to overcome this problem to manufacture uniform and well impregnated thermoplastic composites [3,4,5,6,7]. Homogenous distribution of matrix and reinforcement fibres reduce mass transfer distances [8] and provide short cycle time compare to long processing cycles of some thermoset matrices [9, 10]. Thermoplastic composites are manufactured by melting of the matrix part of the commingled yarns under required heat and pressure. They fill the gaps between fibres and layers and process continues until full impregnation and consolidation is achieved [11]
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