| Rubber is a polymer that has high elasticity. Rubbers will easily produce large elastic or permanent deformation when they are exerting external forces, due to their large elasticity and low modulus. When high-load-bearing and small deformation techniques are required, rubber composites will meet the product’s lifespan. Rubber used in military industries has to meet proper intensity requirements as well as the need to have rebound resilience properties. Also, rubber products’ crazing need to be controlled effective and immediately under high instantaneous stress so that appropriate rubber composites formula and structural designs will be needed.(1)This project chose plain woven fabrics, cords and AFRP as framework materials and three different kinds of skeleton structures were used to enhance five different types of tires with different formulas. The results showed that the fabric structure, single cord row and longitude/ latitude skeleton structures reinforced the rubber preferably. Compared to Cord reinforced rubber samples, fabric structure reinforced rubber samples were less affected by the rubber compounding. With a increasing rate of using carbon black, the three samples of reinforced structures differed from one and another in their failure modes. Fabric samples suffered from rubber breaking at each side due to degumming, so that the rubber part of the sample showed a greater extensional rate. One-way cord samples undermined the extraction of cord and cutting of the rubber. Longitude/ latitude cord was damaged the least and for formula IRG-70(number stands for carbon dosage) and over, it shows fiber breakage with rubber breakage in the place of latitude fiber. When considering controllable damage, longitude and latitude structure will be a better option.(2)Tear tests of three samples showed that all three structures improved the tear resistance of rubber, The fabric reinforced rubber was less affected by the rubber recipes with a tear strength of approximately 53 k N / m, while the cord reinforced rubber was largely affected by the recipe that showed an upward trend in data value similar with that of the rubber samples. The tear strength of IRG-90 samples and fabric reinforced samples are almost the same. From the tear section, it showed that most fabric reinforced samples tears along the direction of 45 °. The cord reinforced samples mostly tear parallel to the stretching direction and most longitude/ latitude structure reinforced samples tear along the direction of weft cords. Result shows that the skeleton structure design has different effect to control the damage in tearing direction.(3) The interfacial properties play a vital role in the determination of the final properties of the rubber composite. T-peel test and H extraction were applied to test interface properties of different aramid fiber / rubber composites. The results showed that, in the same bonding system with the increasing the amount of carbon black filler, T peel strength decrease while H extraction strength increase. Comparison with the sample without adhesion shows that, the use of adhesive can improve H extraction strength significantly. The enhance rates were 991%, 351%, 298%, 277% from IRG- 10-IRG-70. It is considered that H extraction force affects by a variety of factors. An empirical formula is brought out, trying to describe the adhesive effect: y = 8.3581×e0.1588 x. For the stretching process, H extraction process is dominant. Recipe with high carbon black filler amount should be selected such as IRG-70. Otherwise IRG-90 should not be optional due to the increased amount of carbon black decrease the processing performance. |
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