Energy Characteristics and Failure Mechanisms for Textile Spread Tow Thin Ply Thermoplastic Composites under Low-velocity Impact

다국어 초록 (Multilingual Abstract)

Carbon composites are deemed suitable for components with complex geometries which require high impactresistance. The broad range of industrial applications requires composite structures to be lighter and not to compromise withtheir mechanical performance. Non-crimp fabrics with lower fibre areal weight (FAW) are the class of reinforcement materialwhich will only bring the advantages of better mechanical properties but will also offer more longevity to the structures andreduced maintenance costs. This research aims at investigating the low-velocity impact performance of textile spread towthin ply (100 gsm) composites with an aim to study the load bearing capability, deflection characteristics and energycharacteristics. The results are compared with the baseline thick (200 gsm) fibre reinforced composites. There was 19.2 %,16.6 %, and 6.57 % higher peak load for spread tow thin ply composites when compared to thick ply composites at 25 J, 42 J,and 52 J impact energies respectively. Significantly lower residual deflection (40 % to 76 %) and higher major damageenergy (20 % to 33 %) were observed for spread tow thin ply laminates compared to the thick ply variant at different impactenergies. At 42 J and 52 J impact energies, the damage index (DI) was 2 times and 4 times higher for Thick ply laminateshighlighting extensive damage, which is also observed with detailed failure mechanisms study.

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