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Research on the Influence of the Polymer Composite Gear by Adding Self-healing Microcapsules

Author: JiXiaoGang
Tutor: ZhangLi
School: Beijing Technology and Business University
Course: Mechanical Design and Theory
Keywords: Self-healing microcapsules Composites Gear Injection mold Finite Element Analysis Experimental Analysis
CLC: TH132.41
Type: Master's thesis
Year: 2010
Downloads: 33
Quote: 0
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Abstract


The repair mechanism of self-healing microcapsules in polymer added to the E-glass fiber reinforced nylon 6 composites gear analysis of microcapsules on the mechanical properties of the gear, noise and vibration performance and service life. Through a twin screw extruder, with nylon 6, E-glass fiber, a filler, since the repair of microcapsules granulated, using the injection molding process, and to prepare for comparison of two groups of E-glass fiber reinforced nylon 6 gear. Mold analysis to select the type of mold, injection mold structure, mold materials and related parameters, to finalize the structure of the injection mold, drawing processing map, the manufacture of injection molds. Theoretical analysis of polymer viscoelastic polymer creep, relaxation, energy changes and stress - strain relationship is given through the analysis of the three models, quantitative, and composite gear impact, abrasion resistance and damping down The noise analysis provides a theoretical basis. 3D graphics software Pro / E, parametric design, the complete gear 3D modeling process. Created in Pro / E gear assembly model into a finite element stress analysis and mold-state analysis using finite element analysis software ANSYS. The comparative analysis shows that the addition of microcapsules, the teeth of the maximum stress changed slightly to reduce the ratio of 0.31%, and also a slight decrease in the natural frequencies, the biggest drop of 3.8%. The LMS Test.Lab noise and vibration test software, study the modal properties of the gear, and the results show that the addition of microcapsules, the natural frequencies of the gear declined slightly, the largest drop of 3.06%, while the damping ratio has increased; gear surface hardness test results show that the addition of microcapsules gear hardness slightly lower, reduced by an average of 3.37%; impact test of the gear material samples were found contrast notched impact resistance of the material in the addition of microcapsules decreased an average of 2.88% reduction; and friction noise tests on the gear materials like pieces, comparison, the join the microcapsules gear material is lower than most of the temperature and frequency SPL material without microcapsules A-weighted sound pressure level 4 ~~ 5dB lower than without microcapsules containing microcapsules sample. The the Comparative Study results show that adding a small amount of microcapsules affect the mechanical properties of glass fiber reinforced nylon composite and vibration noise; same time, a small amount of self-healing microcapsules added to the glass fiber reinforced nylon material better dispersion and phase capacitive repairable gear fatigue pitting cracks and other defects, which will help extend the life of the gear and reduce costs. Therefore, the composite gear microcapsules feasibility.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > The transmission mechanism > Meshing > Gears and gearing
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