Influence of Shock Prestraining and Grain Size on the Dynamic-Tensile-Extrusion Response of Copper: Experiments and Simulation

Gray, George T.; Cerreta, Ellen K; Yablinsky, Clarissa; Addessio, L. B.; Henrie, B. L.; Sencer, Bulent H.; Burkett, Michael W.; Maudlin, P.J.; Maloy, S.A.; Trujillo, Carl P.; López, M.

doi:10.1063/1.2263424

Cited by 33 publications

(49 citation statements)

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“…This solution allows full control on the firing pressure increasing testing repeatability. In the DTE test initially introduced by Gray III et al [11], the projectile shape was a sphere. In this study, a bullet shape sample geometry, as proposed by Iannitti et al [19], was used.…”

Section: Dte Testingmentioning

confidence: 99%

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Numerical Simulation of Dynamic Tensile Extrusion Test of OFHC Copper

Bonora

Testa

Ruggiero

et al. 2015

J. dynamic behavior mater.

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The dynamic tensile extrusion (DTE) test offers unique possibility to probe material response under very large plastic strain, high strain rate and temperature to support constitutive modelling development. From the computational point of view, the DTE test is particularly challenging and a number of issues need to be assessed before proceeding with material modelling verification. In this work, an extensive and detailed computational work was carried out in order to provide the guidelines for accurate simulation of DTE test. Two constitutive models, the first phenomenological the latter physically-based, were used to simulated the behavior of fully annealed OFHC copper in dynamic extrusion at different velocities. Material models parameters were calibrated using uniaxial test data at different strain rates and temperatures. The number, size and shape of the ejected fragments at different velocity were used as validation metrics for the selected constitutive models. Results indicate that material behavior under dynamic extrusion can be accurately predicted limiting the influence of numerical parameters not related to the constitutive model under investigation. The physically based modelling allows a more accurate prediction of the material response and the possibility to incorporate microstructure evolution processes, such as dynamic recrystallization, which seems to control the response of OFHC copper in DTE tests at higher velocity.

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Section: Dte Testingmentioning

confidence: 99%

“…Los Alamos National Lab (LANL) introduced the dynamic tensile extrusion test (DTE) [11]. In such test, a projectile made of the material of interest is launched into a conical die with an exit opening smaller than the projectile diameter.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Dynamic Tensile Extrusion Test of OFHC Copper

Bonora

Testa

Ruggiero

et al. 2015

J. dynamic behavior mater.

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“…The final grain size was 47 µm using the intercept method neglecting the twin boundaries, 14 µm otherwise. The DTE test configuration is the same as given in Gray III et al [5]. The projectile used in this study has the same mass as in Gray III et al [5] but di↵erent shape.…”

Section: Materials and Testingmentioning

confidence: 99%

“…The DTE test configuration is the same as given in Gray III et al [5]. The projectile used in this study has the same mass as in Gray III et al [5] but di↵erent shape. A bullet shape was selected for practical purposes and because it allows to verify post-mortem the alignment of the projectile at the impact [7].…”

Section: Materials and Testingmentioning

confidence: 99%

“…Murr et al [4], recently, reported complete DRX in copper and iron Explosively Formed Projectiles. Recently, the Dynamic Tensile Extrusion (DTE) test has been introduced by Gray III et al [5] to probe the material at large strain and high strain rate. In this type of test, the material is launched in a conical die and dynamically extruded experiencing plastic deformation that can be larger than 5.0 with a strain rate that is of the order of 10 4 -10 5 s 1 .…”

Section: Introductionmentioning

confidence: 99%

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Modelling and simulation of dynamic recrystallization (DRX) in OFHC copper at very high strain rates

Testa¹,

Bonora²,

Ruggiero³

et al. 2017

AIP Conference Proceedings

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Abstract. At high strain rates, deformation processes are essentially adiabatic and if the plastic work is large enough dynamic recrystallization can occur. In this work, an examination on microstructure evolution of OFHC copper in Dynamic Tensile Extrusion (DTE) test, performed at 400 m/s, was carried out. EBSD investigations, along the center line of the fragment remaining in the extrusion die, showed a progressive elongation of the grains, and an accompanying development of a strong <001> + <111>dual fiber texture. Discontinuous dynamic recrystallization (DRX) occurred at larger strains, and it was showed that nucleation occurred during straining. A criterion for DRX to occur, based on the evolution of Zener-Hollomon parameter during the dynamic deformation process, is proposed. Finally, DTE test was simulated using the modified Rusinek-Klepaczko constitutive model incorporating a model for the prediction of DRX initiation.

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