A Computational and Experimental Analysis of Ballistic Impact to Sheet Metal Aircraft Structures
The ballistic resistance of 2024-T3 and 2024-T351 alloy aluminum flat plates to aircraft engine fragments is evaluated experimentally. Gas and powder gun tests are performed to determine the ballistic speed limit of a spherical steel bullet representing the engine fragment with a diameter of 0.5 inch. The rectangular flat aluminum specimens are prepared as 12 x 12 inch and with three different thickness combinations of 1/16”, 1/8” and 1⁄4”. A normal impact scenario is considered in terms of the orientation of the specimens to the impacting projectile. A computational model is constructed using Johnson-Cook (J-C) material model considering the thermo-viscoplastic behavior of the material with an accumulated damage and an equation of state model. The experimental model was implemented in LS-DYNA to simulate impact tests and validate the ballistic limit findings with a comparison for the failure mechanisms. Under these controlled geometries, controlled impact conditions, and characterized materials with well- defined material properties, experimental damage characteristics are used to determine the essential failure parameters in the material model.
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A Computational and Experimental Analysis of Ballistic Impact to Sheet Metal Aircraft Structures
The ballistic resistance of 2024-T3 and 2024-T351 alloy aluminum flat plates to aircraft engine fragments is evaluated experimentally. Gas and powder gun tests are performed to determine the ballistic speed limit of a spherical steel bullet representing the engine fragment with a diameter of 0.5 inch. The rectangular flat aluminum specimens are prepared as 12 x 12 inch and with three different thickness combinations of 1/16”, 1/8” and 1⁄4”. A normal impact scenario is considered in terms of the orientation of the specimens to the impacting projectile. A computational model is constructed using Johnson-Cook (J-C) material model considering the thermo-viscoplastic behavior of the material with an accumulated damage and an equation of state model. The experimental model was implemented in LS-DYNA to simulate impact tests and validate the ballistic limit findings with a comparison for the failure mechanisms. Under these controlled geometries, controlled impact conditions, and characterized materials with well- defined material properties, experimental damage characteristics are used to determine the essential failure parameters in the material model.
Buyuk.pdf
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