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Developing a Method for Fatigue Life Assessment of Vehicle Biw by Considering Spot Welding Connections

Ahmadi, Alireza | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52221 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farrahi, Gholamhossein; Chizari, Mahmoud; Reza Kashyzadeh, Kazem
  7. Abstract:
  8. One of the most important considerations in the vehicle design procedure is the durability of the components. Among different parts of a vehicle, the body is the main load-bearing component and as a result, its durability is critical. Due to the expensive and time-consuming nature of fatigue tests, finite element based durability analysis is of great interest among automotive industry. The aim of this research is to provide an algorithm for a more accurate and efficient durability analysis of the vehicle body by considering inertia effects. By using the multi-body dynamics model of the full vehicle and the finite element model of the vehicle body, the vehicle body structure is analyzed from the fatigue point of view. The proposed algorithm is used to assess the fatigue resistance of the vehicle spot welds on different standard road classifications and at different velocities. Moreover, to enhance the precision of the analysis, a thickness-dependent nugget diameter was utilized to model the spot welds. The simulation results have shown that the damage to the vehicle body is not always proportional to the vehicle velocity and that depends on the roughness degree of the road surface. Furthermore, the simulations have proven that spot weld nugget diameter has a profound effect on the fatigue life of the spot welds and should be chosen carefully. Another important outcome of the present research is that utilizing quasistatic methods for stress and fatigue analysis can significantly decrease the computation time but may lead to erroneous results if the loading frequency is high enough
  9. Keywords:
  10. Automobile Body ; Fatigue ; Spot Weld ; Life Time Estmation ; Multiaxial Loading

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