Dissertation > Excellent graduate degree dissertation topics show

Study on Numerical Oscillation of Temperature Field Simulation During Forging Process

Author: PanZaiYong
Tutor: WangXinYun
School: Huazhong University of Science and Technology
Course: Materials Engineering
Keywords: numerical oscillations of temperature field centralized heat capacity Mesh refined dynamic time step variable differential coefficient FEM
CLC: TG311
Type: Master's thesis
Year: 2011
Downloads: 45
Quote: 0
Read: Download Dissertation

Abstract


As Chinese enterprises are transforming from Made in China to Created in China, great demand for product of high quality, great precision and advanced techniques has been arisen. In order to simulate analytical parameters like temperature field, strain, flowing state and so on, we need a coupling simulation of heat transmission, microstructure transformation and deformation, so as to get a better process design and quality control, a reduction of product design time and cost. Since temperature field is one of the most important factors in coupling simulation, it is of great value to have an intensive study on the temperature field transformation during the forging process, while reducing the numerical oscillation becomes the key factor of accurate temperature field simulations.This paper mainly focus on the numerical oscillation of temperature filed during forging process, discussed the theory basis of heat transmission, proposed the finite element method equations of temperature field. Based on these equations, improved the solver of the temperature field simulation software-TC, and developed a simplified preprocessor and postprocessor for TC.This paper explained the essence of the numerical oscillation of temperature field, and studied several solutions including concentrated heat method, mesh refining method, dynamic time step method and variable differential coefficient method to reduce or avoid this phenomenon. These methods were integrated into the TC simulation program to examine the effect on the numerical oscillation. The results showed that the numerical oscillation can be avoided by these methods, and the stability and efficiency of the finite element simulation program SF2D/3D were improved.Through Using the TC software and comparing with DEFORM, The research on elimination of the numerical oscillations of temperature field is finished, and the following conclusions made: the numerical oscillation of temperature field generally occurs in large temperature gradient surface in initial phase of the simulation. Concentrated heat capacity method can effectively eliminates the numerical oscillations of temperature field, its simulative results and the simulative results of DEFORM are almost the same. The error is quite small; Mesh refining method can, to a certain extent, reduce the numerical oscillation of temperature field, but the effect is not obvious. Mesh refining method is limited by the simulative time as well as the simulative scale. The reducing of the time step can reduce the numerical oscillation of temperature field effectively. The dynamic time step not only can reduce the numerical oscillation of temperature field effectively and also reduce the simulative time greatly. The bigger the differential coefficient╬▓is, the more inhibited the oscillation is. The smaller╬▓is, the less inhibited the oscillation is. The effect used the variable differential coefficient method to reduce numerical oscillations of temperature field is poor.Finally the TC software is used to simulate the two-dimensional and three-dimensional temperature field. The numerical oscillations of temperature field is eliminated and compared with DEFORM, the error is quite small and meets the requirement of engineering application.

Related Dissertations

  1. Study on Shear Bearing Capacity of HRBF500-Reinforced Concrete Beams,TU375.1
  2. Research and Development of the CAD System on Brushless DC Motor,TM33
  3. The mechanical properties of fiber reinforced concrete research and finite element analysis,TU528.572
  4. Wind turbine tower Optimization Design System Development,TM614
  5. Three-Dimensional Mechanical Model and Influence Factors Analysis of Retaining Structure with Double-Row Piles of Foundation Pit and Its Engineering Applications,TU472.1
  6. Ramp Bridge shear lag and its influencing factors,U441.5
  7. The Study on the Epoxy Asphalt Pavement of Steel Bridge Deck,U443.33
  8. Shanghai Yangtze River Bridge Seismic Response Analysis and Seismic,U441.3
  9. The Surrounding Rock Monitoring and Finite Element Simulation of Subway Tunnel,U456.3
  10. Based on multi-body dynamics and finite element structural strength McPherson suspension with Dynamic characteristic analysis,U463.33
  11. Study on Control Criteria of Stress and Integrity Safety of Super-high Arch Dams,TV642.4
  12. Ice Loads on Conical Structures and the Exploration of the Numerical Simulation Method,U652
  13. Research on the Earth Pressure Arithmetic and Load Bearing Character of Covered Sheet Pile Wharf Structure,U656.112
  14. The Analytical Study on the Node of Steel Frames with Reduced Beam Sections,TU391
  15. Test Study and Finite Element Analysis of the Work Mechanism of the Rock Anti-Float Anchor,TU472
  16. Additional layers of light steel frame structure with seismic design of earthquake response,TU311.3
  17. Double Load Cell Self-balanced Pile Test and Finite Element Analysis About Super-tonnage Foundation Piles in Some Project in Beijing,TU473.1
  18. Establishment and Study on the Simplified Model of Unsteady Heat Transfer of Concrete Radiant Cooling Systems,TU831.6
  19. Foundations of the building gravel cushion shock isolation performance analysis,TU352.12
  20. After the concrete cone failure and the role of anchoring effect of,TU312.3

CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Forging, forging and blacksmith > Forging principle
© 2012 www.DissertationTopic.Net  Mobile