United States Department of Transportation
i
Experimental Testing to Characterize Plastic Deformation, Dynamic Response, and Ductile Fracture of Inconel 718 Under Various Loading Conditions
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2023-09-01
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[PDF-7.81 MB]
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Edition:Final Report
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Abstract:A team consisting of Federal Aviation Administration (FAA) Propulsion Research Program, The Ohio State University (OSU), George Mason University (GMU), and the National Aeronautics and Space Administration Glenn Research Center (NASA-GRC) collaborated to develop a new material model in LS-DYNA for impact applications of Inconel 718, a nickel based superalloy used widely for turbine engine hot section blades, disks, cases, and other components. This report details mechanical testing of the plastic deformation and rupture of precipitate hardened Inconel 718. Specimens were tested in tension, compression, and shear under a wide range of strain rates from 10-4 s-1 to 5000 s-1 and temperatures from 23 °C to 800 °C. Experiments were conducted on five different plate stocks of thickness 1.27 mm, 2.03 mm, 3.17 mm, 6.35 mm, and 12.7 mm. Specimens were cut in different orientations to examine the directional dependence of the material. Dynamic tests were conducted using split Hopkinson bars. Full field strain measurements were made using digital image correlation (DIC) techniques. Ductile fracture was also examined for different stress states induced by subjecting various specimen geometries to different loading conditions. Fracture tests included tension experiments on notched plane stress, plane strain, and axisymmetric specimens as well as combined loading tension-torsion and compression-torsion experiments of tubular specimens and punch tests on flat specimens. The material test plan, experimental setups and procedures, specimen designs, and results are presented and discussed in detail. The Inconel 718 tested exhibits significant strain hardening and strain rate sensitivity as well as a general decrease in strength with increasing temperature.
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