Hydrodynamic Ram Analysis Of Aircraft Fuel
Tanks With Different Composite T-joint Designs
Author(s)
S. Heimbs, T. Duwensee, A. C. Nogueira & J. Wolfrum
Abstract
Three different composite T-joint designs were investigated experimentally and
numerically for application in fuel-filled wing tanks under hydrodynamic ram
(HRAM) loads. The test campaigns covering 0° T-pull and 30° T-bending tests
were conducted under quasi-static and high-rate dynamic conditions in order to
assess potential strain rate effects on the failure behaviour. In addition to the
experimental test campaign, numerical modelling with the explicit finite element
code LS-Dyna was conducted with the models being validated against the test
results and being applied to ballistic impact simulations of a composite fuelfilled
tank structure. While the unreinforced baseline design showed a rather
brittle behaviour and poor performance, significant residual strength
improvements and structural integrity under HRAM loads could be obtained
with a hybrid design with metallic, arrow-shaped z-reinforcements between the
composite laminates of skin and spar. A promising macro modelling approach
for an efficient representation of the T-joint failure behaviour in large models
was derived and successfully applied to structural HRAM simulations.
Keywords: composite T-joint, hydrodynamic ram, ballistic impact simulation.
Keywords
composite T-joint, hydrodynamic ram, ballistic impact simulation.
Related Book
Other papers in this volume
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