Thermo-mechanical analysis of an SI engine piston usingdifferent boundary condition treatments
来源期刊：中南大学学报(英文版)2015年第10期
论文作者：Amir-Hasan Kakaee Javad Gharloghi Aliasghar Foroughifar Abdoreza Khanlari
文章页码：3817 - 3829
Key words：piston; temperature; boundary condition; stress; thermo-mechanical analysis
Abstract: heat transfer of an SI engine’s piston is calculated by employing three different methods based on resistor-capacitor model with the help of MATLAB code, and then the piston is thermo-mechanically analyzed using commercial ANSYS code. The results of three methods are compared to study their effects on the piston thermal behavior. It is shown that resistor-capacitor model with less number of equations and consequently less solution time, is an appropriate method for solving problems of engine piston heat transfer. In the second part, the thermal stresses due to non-uniform temperature distribution, and mechanical stresses due to mechanical loads are calculated. Finally, the temperature distributions as a thermal load along with mechanical loads are applied to the piston to determine the total stress distribution and critical fracture zones. It is found that the amount of thermal stresses is considerable.
Amir-Hasan Kakaee1, Javad Gharloghi2, Aliasghar Foroughifar3, Abdoreza Khanlari4
(1. School of Automotive Engineering, Iran University of Science & Technology, Tehran, Iran;
2. Iran Khodro Company, Tehran, Iran;
3. Department of Mechanical Engineering, Golpayegan University of Technology, Golpayegan, Iran;
4. School of Industrial Engineering, South Tehran Branch, Islamic Azad University,Tehran, Iran)
Abstract:heat transfer of an SI engine’s piston is calculated by employing three different methods based on resistor-capacitor model with the help of MATLAB code, and then the piston is thermo-mechanically analyzed using commercial ANSYS code. The results of three methods are compared to study their effects on the piston thermal behavior. It is shown that resistor-capacitor model with less number of equations and consequently less solution time, is an appropriate method for solving problems of engine piston heat transfer. In the second part, the thermal stresses due to non-uniform temperature distribution, and mechanical stresses due to mechanical loads are calculated. Finally, the temperature distributions as a thermal load along with mechanical loads are applied to the piston to determine the total stress distribution and critical fracture zones. It is found that the amount of thermal stresses is considerable.
Key words:piston; temperature; boundary condition; stress; thermo-mechanical analysis
