Hybrid Fiber Reinforced Friction Material

In this paper, Conducted the friction and wear tests on natural biological hybrid fiberreinforced friction materials using single factor experiment design, Got the variation forfriction coefficient and wear rate of the friction material, Also observed and analyzed thewear morphology of this friction materials.Firstly, carrying out the friction and wear tests on natural biological hybrid fiberreinforced friction materials. Friction factor in friction heating process and the recoveryprocess is relatively stable of hybrid bio-fiber reinforced friction material, However, thereare great fluctuations in the friction factor in not added bio-fiber friction material. Bio-fiberreinforced friction materials have a lower wear rate than those without adding bio-fiber, andthe wear rate change consistent of bio-fiber reinforced friction material, When thetemperature reached200℃wear rate increases, The wear rate at250℃lower than that at200℃, Wear rate increases as the temperature continues to rise.Evaluate the natural biological hybrid fiber friction material using fuzzy comprehensive,the results show the best friction factor of the sample is No. M8, comprehensive evaluation is0.73, comprehensive evaluation of the comparative samples is0.48. The best wear rate of thesample is No. M6, comprehensive evaluation is1, comprehensive evaluation of thecomparative samples is0.693. Comprehensive Evaluation of friction coefficient and wearrate, The results showed that the best overall performance is sample M9, comprehensiveevaluation value of0.75, a comprehensive evaluation of the results of the comparativesamples was0.54, Conduct the comprehensive evaluation of the results using range analysis,The results showed that friction materials have the best overall performance when bamboofiber, wool and jute fiber content is3%,3%,1%, Respectively. Consistent with the fuzzycomprehensive evaluation method for evaluation of results.Thermal recession performance and recovery performance are poor quality when thecarbon fiber percentage at0%,7.0%and29.6%, but the change was not significant. Carbonfiber reinforced friction coefficient of friction material is relatively stable when thepercentage of carbon fiber quality in11.3wt%, And is not sensitive to changes intemperature, no serious recession at high temperature. Wear rate increases as the temperatureincreases the friction in four friction material;11.3wt%carbon fiber friction materials having good wear resistance followed was added29.6wt%, No carbon fiber frictionmaterials exhibit the worst wear resistance, the wear surface rough, and there are adhesiveshedding phenomenon.Establishment of a single fiber stress transfer analyses, established in a single fiberfriction material segment crack destruction process utilizing Monte Carlo analysis methods.On this basis, analysis the factors in a single-fiber composites segment crack destructionprocess. The results showed that: When the Weibull shape parameter M of fiber strengthdistribution is large, the greater the number of segments of fiber breakage when single fibercomposites fracture process is completed. Gradually increasing the number of fiber fracturewith increasing fiber scale parameter, With m=5, for example, a fracture strain of the fibersin the load of1.7%, the number of broken fibers increases gradually with increasing stress,reached the maximum number of broken fiber strain load reaches4.1%, after that, notincrease the number of broken with the fibers increases the tensile stress, Show that the fiberhas been completely broken into fiber segments.Establish a numerical model of single fiber composite system, fully consider theparameters of fiber, matrix and interface items, Combined with shear lag theory, modelingutilize of fiber nodes and interface bonding method, analysis the fiber stress on this basis,Results show that the fibers play a major role in the single-fiber composite bearing system,The fiber carrying capacity decreased with increasing stress. Fiber load reduced to about2400N when the axial load is of3%.Simulate the fracture process monofilament fiber composite systems under externalloads, and analyze the forces after breaking the fibers. stress fibers will be re-distributedwhen the fiber breakage, However, the fibers can continue to bear the loads due to theengagement substrate. Stress fibers gradually restored when the external load continues toincrease. As can be seen from Figure, after the break the fiber occurs, the stress distributionin the form of each fiber section is substantially the same, but the decrease in the carryingcapacity of each segment.