Investigations of future shielding solutions for aircraft rear ends against debris

Kurzfassung

Simulation methodologies for the assessment of the impact behavior of materials against potential threats were developed within the European Clean Sky II Program. In the scope of the project, four materials were selected: an aluminum Al2024T3, a unidirectional T700 fiber reinforced M21 epoxy, a tri-axially braided AS4c fiber reinforced M36 epoxy and a tri-axially braided Zylon AS fiber re-inforced Cycom 890 epoxy. The missing basic parameters for numerical investigation were then determined from results of material characterization tests conducted during the project. Three high velocity impact test campaigns were performed to assess the performance of the selected materials. A simulation methodology was developed and validated for the different target materials using the results of selected high velocity impact tests. At the end of the investigations, appropriate meshes and the corresponding specific material card parameters were chosen within the validated simulation results to assess the impact behavior of shieldings for non-tested high velocity impact test cases. The investigations evidence that a large number of effects/mechanisms occurs in high velocity impact events when considering various threats and that simulations are unavoidable in the selection of appropriate shielding solutions.