Finite Element Analysis Of Engine Piston And Piston Pin

Piston is one of the most important components in engines. It endures heat loadtransferred by gas combustion and mechanical load caused by piston up-and-downmovement at work. The investigations previous indicated that heat load was the majorfactor to cause ablation and heat crack on the piston head, and mechanical load was easy tobring crack at piston pin seat. In this study, the fatigue experiment for aluminium alloy piston components, which issupported by Shandong Binzhou Bohai Piston Co., Ltd., is performed under the cyclicmechanical load, and simulated by finite element method. The detailed work is as follows:1. The fatigue experiment for aluminium alloy piston components is carried out underthe cyclic mechanical load on the mechanical fatigue machine of piston pin seat,and the cause and character of fatigue failure are also discussed.2. The PRO/ENGINEERING software is applied to establish the 3-D solid modelaccording to the real relationship of piston and piston pin.3. According to the FEM theory, the analyzed model is established in ANSYSsoftware with meshing and applying the conditions. Considering the materialproperties of piston and piston pin, the linear elastic-plastic model is also obtainedwith the solution of N-R method. According to the loaded pattern, the dynamicresponse of stress-strain is analyzed using the Newmark algorithm of transientanalysis full method and the stress concentrated place is determined.Tthe analysisof transient response of this place is carried out. The conclusion can be obtainedthat the stress is larger then the yield strength with the existence of plastic strain.4. The couple contact is applied to simulate the forces of piston and piston pin andthe Lagrange method is used to the contact stress. Based on the contact theory, thecontact statues and contact stress response are analyzed. The action of alternatingloads cause the mutual motion at the surfaces, and the contact stress concentratedpoint is formed at the end of contact surfaces which increases the possibility offatigue failure at the piston pin seat.5. The simulated results are agreed with experimental ones, and it is feasible foranalyzing the relationship between them to use the method of transient contact.