Abstract
Abstract A set of explicit nonlinear finite element analyses was performed to determine the collapse characteristics of the Lynx helicopter main liftframe, for the vertical crash case. The liftframe was modeled by the Belytschko-Tsay four node shell elements. The analysis of the influence of the collapse velocity on the component structural failure modes and a sensitivity analysis of the material failure criteria were performed. The increase in crashing velocity from 4 to 8 m/s changed the mode of structural failure from torsional to bending/axial failure. The material failure criteria, however, did not significantly affect the structure collapse mechanism nor the force vs. displacement results. The simulation results showed good agreement with the full scale test data.
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