Prediction of the torsional stiffness of a 24 kV marine power cable

Abstract This paper presents a numerical approach based on a simplified, scaled-down finite element (FE) model to predict the dynamic torsional behavior of a 24 kV dynamic power cable (DPC), since torsion-induced FE models are underrepresented in the current literature. The study focuses on estimating the torsional stiffness of the cable, a key mechanical property during early design stages. The FE model is developed using ABAQUS 2025 and calibrated through experimental torsion and traction tests performed at Université Gustave Eiffel in Bouguenais, France. The numerical domain is reduced to a representative section of the cable, enabling efficient modeling while preserving the essential mechanical interactions. To validate the model, simulation results are compared with both experimental data and an analytical axial stress calculation based on the equations developed by Witz and Tan (1992). The results show strong agreement across all approaches, demonstrating the model’s reliability in capturing the linear torsional response of the DPC. This work confirms that a simplified FE model can serve as an effective predictive tool for torsional stiffness in the initial phases of offshore cable design.