Numerical Simulation of Dynamic Tensile Extrusion Test of OFHC Copper

• The dynamic tensile extrusion (DTE) test offersunique possibility to probe material response under verylarge plastic strain, high strain rate and temperature tosupport constitutive modelling development. From thecomputational point of view, the DTE test is particularlychallenging and a number of issues need to be assessedbefore proceeding with material modelling verification. Inthis work, an extensive and detailed computational workwas carried out in order to provide the guidelines for accuratesimulation of DTE test. Two constitutive models,the first phenomenological the latter physically-based, wereused to simulated the behavior of fully annealed OFHCcopper in dynamic extrusion at different velocities. Materialmodels parameters were calibrated using uniaxial testdata at different strain rates and temperatures. The number,size and shape of the ejected fragments at different velocitywere used as validation metrics for the selected constitutivemodels. Results indicate that material behavior under dynamicextrusion can be accurately predicted limiting theinfluence of numerical parameters not related to the constitutivemodel under investigation. The physically basedmodelling allows a more accurate prediction of the materialresponse and the possibility to incorporate microstructureevolution processes, such as dynamic recrystallization,which seems to control the response of OFHC copper inDTE tests at higher velocity.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Annan teknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Other Engineering and Technologies (hsv//eng)

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