Research On The Load Distribution Of Mechanical Connection Structure Of Titanium And Composite Panel By Simulation And Experiment

When a large number of aircraft structures using carbon fiber composite materials, there are a lot of mixed material connecting structure.The carbon fiber composite and metal hybrid structure appears inevitable. For example, the joints of aircraft structure, the use of titanium alloy and carbon fiber composite material connecting structure. Large aircraft are made by the various components assembled from a variety of fasteners. Even the A380 through the extensive use of composite materials reduces the overall structure of fasteners used, but its use of fasteners has reached a million the number of volume. In determining these bearer connection structure design,load distribution of each fastener is necessary to measure. It is determined by testing each fastener carrying value is temporarily unable to achieve. Therefore, using the finite element method, and by simplifying the connection model appropriate for each member of the fasteners to load distribution simulation is a feasible method. For the analysis of complex simulation group bolted joints should not only take into account the accuracy of the results contained in the nail should be considered in the simulation model is connected ease.In order to obtain a connection structure of complex load distribution results, this paper carried out the following research:First using Patran software simulation, simulation using shell elements. And Fastener, Spot-Weld,Bart, RBE2 connected to four kinds of models, static analysis. To obtain an accurate and efficient way to connect the simulation results and experimental coMParison.Secondly, failure analysis for the four connections simplified model is connected composite laminates and positioning the first layer failure. And co MParison with the test results, the results of the Spot-Weld model agreement with experimental results. So get Spot-Weld model in connection with the bolt more suitable for simulation.Then a uniaxial tensile strength test of titanium and composite panel connecting structure conducted. And the strain of structure is measuredt to gey load transfer path of the structure.Finally, MSC.Apex, MSC.Patran, MSC.Nastran software finished titanium and composite connecting structure load distribution simulation. The simulation uses a single Spot-Weld to simulate the shear bolt connector and two Spot-Welds Analog Dual shear bolt connection. Using a total of 333 Spot-Welds, in the simulation model,obtained carrying value of each unit, positioning the location of dangerous bolt. And co MParison with the test to determine the risk of the bolt position is consistent with experimental results. Simulation method herein may provide for the simulation of complex connector structure design.