CNT textile architectures for composite reinforcement: finite element modeling and stability analysis

Introduction: Carbon nanotubes (CNTs) are flexible and can be utilized to braid the fabric that possess strong and flexible properties. However, regarding CNT fabric, almost any strategies for making textile have not been elucidated. Materials and methods: Finite element modelling of the carbon nanotube fabric was conducted via ANSYS software (ANSYS R2023 R2), employing a triangular structure of CNT yarns combined with a reverse pattern featuring a 90-degree phase difference. The analysis incorporated contact element analysis with a weak spring assumption. We investigated the stress variation among the components and analyzed the relationship between the maximum and minimum stresses. Results: A fabric structural pattern, specifically designed for energy production applications, such as wind turbine blades and automotive engines, has been proposed. Stability analysis, which considers yarn–yarn interactions, including sliding and wrinkling, has been performed to investigate the structural stability of composites. We also discuss the relationship between the braiding patterns and composite properties in the context of actual engineering applications. Conclusions: A CNT braiding pattern has been proposed and validated for its higher strength and higher failure strain, which are associated with an increase in strain when detachment occurs. Local strain concentration mitigation will lead to a balance in local stress and total stiffness, yielding high reliability in turbine blades and/or construction usage of CNT fabrics as reinforcements.