Hyperelastic Modelling and Limit Stress Prediction of Natural Rubber/Rubber Seed Oil (Hevea brasiliensis) Modified Kaolin Composites
[1]
Chukwutoo Christopher Ihueze, Department of Industrial Production Engineering, Nnamdi Azikiwe University, Awka, Nigeria.
[2]
Chinedum Ogonna Mgbemena, Department of Mechanical Engineering, Federal University of Petroleum Resources, Effurun, Nigeria.
This study deals on hyperelastic modeling and prediction of limit stresses of organo-kaolin filled natural rubber vulcanizates with the filler oleochemically derived from the complex intercalate of hydrazine hydrate and rubber seed oil (Hevea brasiliensis) modified kaolin for tyre side wall applications. The stress-strain data reports of Natural Rubber/Rubber Seed Oil modified kaolin (NR/RSO) obtained from uniaxial tests conducted were used to develop hyperelastic models by employing ANSYS 14.0 software. The Yeoh 3rd Order model was observed to give perfect fit for NR/RSO modified kaolin composites. The energy absorption capacities were evaluated on the functions derived from stress-strain data to establish the toughness of NR/Unmodified Kaolin and NR/RSO modified Kaolin. The NR/Unmodified kaolin composite has its approximate strain energy as 29.1147MJ/m3 at 2phr while the NR/RSO kaolin composite has its approximate strain energy as 51.5899MJ/m3 at 10phr. Plane stress analysis executed on ANSYS 14.0 gave limit stress distributions in terms of von-Mises stresses in the range 1.28897MPa-1.41134MPa. The maximum principal stress is found to be higher than the ultimate tensile strength of 1.335938MPa hence the material is safely specified with load range of von-Mises 1.28897MPa-1.335938MPa. Atomic Force Microscopy conducted on the respective natural composites further validated micromechanically the reason for optimum results obtained for NR/RSO modified kaolin composites.
Hyperelastic Behaviour, Energy Absorption Capacity, Strain Energy, Von-Mises Stress, AFM
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