Response of A-6Landing Gear Door to Air Shock Loading.

摘要

Response of an A-6 Aft Main Landing Gear Door to static and transient pressure loads has been calculated with the NASTRAN finite element structural analysis computer code. On the basis of manufacturer's static tests these doors have been considered to be the structural items on the plane most sensitive to shock loading. Displacements calculated for static loading compare favorably with those measured on tests. However, examination of the stress distribution in the door panels indicates that the 2.5 psi shock limit established by the manufacturer is conservative. The linear elastic NASTRAN stress calculations indicate that at an altitude of 50,000 ft the door should be able to withstand a 3 psi free-field shock normally incident on its outside surface if the peak stress is not to exceed the yield strength. At sea level, the door should withstand a free-field shock of 4.3 psi, normally incident. (Author)