Influence Of Riveting Angle And Direction On Fatigue Performance Of Connecting Piece

The most damage of modern aircraft is fatigue broken occurring in the connection parts of the fuselage.As the most common connection way in the aircraft assembly,the quality of riveting has a crucial impact on aircraft fatigue performance.There are many factors influencing the riveting quality,and the influence of riveting angle and direction on fatigue performance of connecting piece is unclear.So,this paper studies it.The research background and the research status of riveting fatigue performance are introduced firstly.On this basis,the significance of research of riveting angle and direction in riveting process is put forward.In order to complete the riveting finite element modeling and experimental verification successfully,and select the appropriate research method of fatigue behavior of connecting piece,the crafting of common riveting,the riveting process,the basic concept,the type and the research method of fatigue are summarized and analyzed in this paper.The fatigue performance of connecting piece is studied by means of finite element analysis and fatigue test.In this paper,the three-dimensional finite element model of single nail riveting is established by ABAQUS software.The dynamic simulation of the riveting process is carried out.The correctness of finite element model is validated by comparing the simulation data of the pier head size and press riveting force with testing data.Adjusting the angle and direction of the punch in the finite element model to simulate the riveting process at angle of 0°,1°,2°,3°and direction of 0°,180°respectively.At the same time,the finite element simulation of the static tensile was carried out.The riveting test of single-nail connecting piece is designed and carried out by using INSTRON-8872 fatigue testing machine.The influence of riveting angle and direction on fatigue performance of connecting piece is analyzed by observing the results of the fatigue test,combining with the deformation of the connecting piece,the stress distribution of the hole and the rivet obtained by finite element simulation.Then,the conclusion is drawn.