The effect of natural rubber (NR) coating on the quasi-static tensile properties of unidirectional Dyneema® SK-76 single yarn is experimentally studied. Single Dyneema® SK-76 yarns are uniformly coated with pre-vulcanized natural rubber latex. Quasi-static tensile tests are performed on plain (uncoated) and NR-coated samples at the strain rates of 0.006 s−1, 0.06 s−1 and 0.6 s−1. The force and strain at peak, and the tenacity of the plain and NR-coated yarns are obtained for each strain rate. The results show that the peak force in the plain samples increases with strain rate to a maximum of 163 N. The tenacity (breaking force per denier) of the uncoated yarns also, in correspondence, increases with strain rate. In contrast, the tenacity of the NR-coated samples remained constant at but a lower value than that of the plain samples. It is observed that peak force sustained by the NR-coated yarns is insensitive to strain rate and up to 560% higher than that supported by the plain yarns. The peak strain of both the plain and NR-coated samples varies with strain rate in a comparable fashion. However, the peak strain values of the NR-coated yarn are greater by an average of 20% than of the plain yarn. The experimental data thus reveal that NR coating has a constructive effect on the peak force and peak strain of the yarn but decreases its tenacity to a constant value. Micrographs of the fractured samples obtained from Field Emission Scanning Electron Microscope are studied to explore the role of NR in the failure mechanism of the coated yarn.

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