Abstract
In this study, the dynamic behaviors on a valve seat subjected to the impact of the valve disc at low velocities were investigated by using numerical analysis with finite element method. The impact damage of the valve disc against seat was evaluated through a three-dimensional dynamic explicit calculation. The parameters considered in the simulations were impact velocity, disc obliquity, aspect ratio, and contact area ratio. The model for impact calculation was implemented in the code ABAQUS, which is based on the constitutive equation and fracture strain equation of Johnson and Cook, as well as on continuum damage mechanics. The distribution of damage caused by the impact was computed and discussed. The impact damage of the valve disc was minimized when the disc obliquity was approximately 40°. The effects of variation of selected design parameters on dynamic behaviors were discussed. The best design parameters were proposed, which served as a guide for future valve design.
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Recommended by Associate Editor In-Ha Sung
Mao Jianfeng, a lecturer in the College of Mechanical Engineering at ZheJiang University of Technology, Hangzhou, China, holds a doctor of philosophy degree from Shanghai Jiaotong University. His research interests include hightemperature structural integrity and chemical-mechanical system.
Wang Weizhe is an associate professor in the School of Mechanical Engineering, Shanghai Jiao Tong University, China. His research interests focus on the structural analysis of high-temperature components and constitutive models.
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Mao, J., Wang, W., Zhang, J. et al. Numerical investigation on the dynamic behaviors of turbine valve disc-seat impact at low velocity. J Mech Sci Technol 29, 507–515 (2015). https://doi.org/10.1007/s12206-015-0111-4
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DOI: https://doi.org/10.1007/s12206-015-0111-4