Stress and Fatigue Damage Computation of a Nose Landing Gear

Krishna Lok Singh

Abstract


In this paper, the modeling of a Nose Landing Gear (NLG) is done using 1D beam elements and 3D tetrahedral elements. The h-type convergence simulation has carried out in three sizes of elements as 2.5, 5 and 10mm for beam elements. In the 1D beam element model, the modeling of bearing is done with one and two Multi Point Constraint (MPC) elements. The stresses from the 1D model with one and two MPCs, and 3D element model results were compared. Experimental strain values are compared with the 1D and 3D NLG models. The Fatigue Damage computation is presented using Stress-Life (S-N) approach the stress combination used are Maximum principal, von-Mises, and Critical plane. Simulation has been done with mean and without mean stress correction. The fatigue damage/ life benchmark problem of a plate with a hole is simulated for three configurations of full, half and quarter models. The stresses and damage results for the three configurations are the same. The stress results of NLG with the fatigue material properties and lateral drift loading spectrum are analyzed using multi-axial fatigue damage algorithms.

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References


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