High stress durable fiber-reinforced NR/SBR composites were prepared by melt compounding process. Both
monotonic and fatigue properties of composites were noticeably improved as fiber volume fraction increased. Various
hyper-elastic models were employed to evaluate the monotonic stress-strain response of the composites. Predicted
results by Arruda-Boyce and Yeoh models showed more deviation from experimental data with increasing fiber
content, while Ogden and Marlow models were applicable for various fiber contents. Results of ratcheting tests showed
that incremental progress in ratcheting strain stayed constant after some stress cycles forming a plateau. The formation
of plateau was found to be dependent on the fiber volume fraction. Experiments showed that the plateau occurred at
48th cycle for NR/SBR blends with fiber volume fractions of 30%. While samples with no fiber content fractured at 3rd
cycle without a plateau response in data.