Modified Aramid Pulp in Carbon Black‐Filled Natural Rubber: Constitutive Model and Finite Element Validation

ABSTRACT Aramid fiber (AF) is a synthetic organic fiber characterized by high strength, high modulus, low density, and excellent abrasion resistance. Rubber possesses high elasticity but exhibits low modulus and poor wear resistance. Incorporating aramid fiber into a rubber matrix aims to create a composite material with unique properties, thereby expanding its application scope. To this end, experiments were designed with varying AF content. Results indicate that increasing AF content accelerates the vulcanization rate of the composite while slightly reducing crosslink density. At an AF content of 8 parts, tensile strength and elongation at break improved by 5% and 5.8%, respectively, compared to the AF‐free sample, demonstrating superior strength and toughness. Payne effect analysis reveals that AF enhances filler dispersion within the rubber matrix. Dynamic mechanical analysis revealed that AF addition can regulate the material's wet slipperiness and rolling resistance properties. Finite element simulations based on the Yeoh constitutive model successfully described the hyperelastic behavior of the composite material under different strains, with good agreement between simulation and experiment ( R 2 > 0.98). This lays the groundwork for further research on composite products and indicates a strong correlation between liquid aramid‐filled natural rubber and material fracture failure. These findings elucidate the reinforcement mechanism and optimal dosage range of liquid‐modified aramid in natural rubber, providing theoretical justification and design foundations for its application in high‐end engineering fields.