115 - IN-PLANE SHEAR BEHAVIOR OF CARBON FIBRE REINFORCED THERMOPLASTIC COMPOSITES (CompTest 2025)
Although carbon fibre reinforced thermoset composites (CFRTS) have been widely used in engineering structures owing to their high specific strength and stiffness, recycling them is difficult. On the other hand, carbon fibre reinforced thermoplastic composites (CFRTP) have been considered as a potential alternative due to their easier recyclability. However, the behaviour of CFRTPs is more complicated due to the presence of various mechanisms, namely plasticity, damage (ply damage and delamination) and possible fibre reorientation due to extensive deformation. This can be seen in its highly non-linear response during in-plane shear tests. While existing models can accurately capture the in-plane shear behaviour for CFRTSs [1, 2], no such model has been demonstrated for CFRTPs. To address the gap, this works aims to study the in-plane shear behaviour of CFRTPs and build a model that includes all the main failure mechanisms. The material used in this work is T700 carbon fibre reinforced nylon-6 (CF/Nylon) prepreg supplied by Maruhachi Group. The composite plates are consolidated in a hot-press machine under 260°C and 4 bar pressure. The in-plane shear properties were characterized based on tensile tests of a [±45°]4𝑠 laminate (ASTM D3518). To further study the mechanism of the laminates, interrupted tests were done at different strains, and microscopic observation on the samples were done after the tests.
Date
21.05.2025.
Keywords
Thermoplastic composite, Plasticity, Damage, Fiber orientation
