Validation of the MAGNA (Materially and Geometrically Nonlinear Analysis) Computer Program for Nonlinear Finite Element Analysis of Aircraft Transparency Bird Impact.
AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH
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The approach taken for validation of MAGNA is based on the simulation of full scale bird impact tests followed by a comparison of the experimental data with that computed by MAGNA. To date, five of these validation studies have been accomplished and several more remain to be conducted. This paper summarizes the results of the validation studies which have been completed to date and lists the user guidelines which have been established in the process. These first validation studies may be characterized as analyses of simple structures, i.e. only single transparent panels have been analyzed as opposed to complex systems of multiple panels joined by metallic edgemember support structure. These same studies may be further characterized as involving only simple definitions of boundary conditions and a somewhat arbitrary procedure for the explicit definition of bird impact pressure loading on the surface of the structure. The cases selected for study were a flat, laminated glass windshield panel a curved, laminated glass windshield panel a curved, laminated plastic windshield panel a bubble-shaped monolithic plastic one-piece canopy and a heated glass cylinder which involved neither an aircraft transparency system per se nor bird impact loads.