Explicit Finite Element Analysis of 2024-T3/T351 Aluminum Material under Impact Loading for Airplane Engine Containment and Fragment Shielding

摘要

Uncontained aircraft engine failure can cause catastrophic damaging effects to aircraftrnsystems if not addressed in the aircraft design. Mitigating the damaging effects ofrnuncontained engine failure and improving the numerical modeling capability of thesernuncontained engine events are crucial. In this paper, high strain rate material behavior ofrnone of the most extensively used materials in the aircraft industry is simulated andrncompared against ballistic impact tests. Ballistic limits are evaluated by utilizing explicitrnFinite Element (FE) simulations based on the corresponding ballistic impact experiments.rnLS-DYNA is used as a non-linear explicit dynamics FE code for the simulations.rnJohnson-Cook material model is employed as a thermo visco-plastic material modelrncoupled with a non-linear equation-of-state and an accumulated damage evaluationrnalgorithm for the numerical simulations. Predictive performance of the numerical modelsrnis discussed in terms of the material characterization efforts, material model parameterrnsensitivities and mesh sensitivities.