Gears are key rotor components of many machines and are widely used in many engineering fields such as mining machinery, aerospace; transportation and petrochemical etc, and their failure often cause disastrous results. In practical engineering, it is still tedious to assess gears strength and the stress levels of them are very high nowadays. It is well known that the stress analysis is a basic work of age analysis and reliability analysis. Do a finite element analysis (FEA) is necessary before and after the gears have been made. In this paper, a detail analysis is done with FEA, and the stress distribution of gear is consistent with the real distribution. Also the FEA results show that the location of maximum stress is just the failure site of the gear. The analysis results are meaningful for further work such as reliability assessment and optimization design.
Taking into account the uncertainty in material property and component quality, a complex mechanical component such as a gear should be treated as a series system instead of a component when evaluating its reliability, since there exist many sites of equal likelihood to fail. Besides, conventional system reliability model is not applicable to such a system because of the statistical dependence among the failures of the every element (damage site). The present paper presents a model to estimate complex mechanical component reliability by incorporating order statistic of element strength into load-strength interference analysis, which can deal with multiple failure mechanisms, reflect statistical dependence among element failure events and that among different failure modes.
Flange is a common part in engineering, and it is tedious to build the 3D models of flanges repeatedly. Nowadays 3D modeling softwares are widely used in many engineering fields such as mining machinery, transportation and petrochemical. In practical engineering, it is necessary to compute the reliability of a flange. For these reasons a reliability design system of flange was developed with VC and Protoolkit. In this system, we only need to input several parameters to build a flange model and to compute its reliability. Also it is easy to determine the key sizes of a flange with an appointed reliability. The application of the software shown that using the software can improve the work efficiency and decrease the labor intensity of designers.
Aluminum alloy structures are widely used in engineering practice. The advantage of aluminum alloy is light weight and corrosion resistance. For different application fields, the structures of aluminum alloy components are very different. They are typically lighter for the same strength and provide better heat conduction. As we know that do FEA (finite element analysis) is necessary before and after the alloy structures have been made. In this paper, a detail analysis was done with FEM (finite element method), and the stress distribution of alloy structures was obtained. Also the FEA results show that the maximum stress is much less than the yield stress and the stress concentration of the round is need to notice.
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