Techniques for designing prefabricated cable accessories based on hyperelastic material model

The interface between cable insulation and stress cone is commonly regarded as the most critical area of a prefabricated cable accessory. To enhance the overall performance, the contact pressure on the interface should be carefully designed. Linear material models are widely used in the industry to estimate the deformation of stress cone, but this method can hardly offer an accurate estimation for deformation above 5% because rubbers conform more to the non-linear material at this elongation range. This paper proposed a method, based on the hyperelastic model (Mooney-Rivlin) fitted from the uniaxial tensile test data. Compared to the present ones, this method offers a more accurate estimation of deformation above 10%, and therefore, helps in the verification of stress cone design and indirectly improves the reliability of high voltage cable accessories.