Test And Strength Analysis Of Pylon’s Connection Of An Airliner Engine

Aero-engine pylon is an important part of an airliner. It must withstand and transfer the heavy loading of aero-engine in flight, while should successfully break away when accidents happen to protect the wing fuel tanks from damage. Its strength and stiffness relates directly to security of aircraft. In order to study the load carrying and transferring properties of the aero-engine pylon, static test with service load on pylon has been carried out in this dissertation. The strain, displacement and load of the pylon structure under eight work conditions was gathered. The measured data can serve as a basis for strength and stiffness assessment of the aero-engine pylon.On the basis of static test system, a finite element model of the pylon structure was set up. A contrast between simulation result and test data has been taken to examine the rationality of the model. And then with this model, an intensity analysis was carried out to the pylon’s connecting rods. The stress nephograms of upper connecting rod and brace rod under every work conditions was obtained. The result shows that the rods were often suffering bending besides tensile or compressive loading. So the distribution of stress crossing the section of rods is inhomogeneous.Besides, to study the pylon’s break-away performance, an intensity analysis was carried out to the fuse pins, which connect the pylon and wing. A model was established for the 3D finite element nonlinear contact analysis for the upper connecting rod’s fuse pin. With this model, the ultimate bearing capacity of upper connecting rod’s fuse pin was computed through step increment loading method. At last, a shear test was performed and the load-displacement curve was compared with the simulation result. Comparison result shows that the ultimate bearing capacity computed by the finite element model is true and believable, and the modeling method is reasonable and reliable.