Modeling anisotropic plasticity: Eulerian hydrocode applications of high strain-rate deformation processes

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Description

Previously developed constitutive models and solution algorithms for anisotropic elastoplastic material strength are implemented in the two-dimensional MESA hydrodynamics code. Quadratic yield functions fitted from polycrystal simulations for a metallic hexagonal-close-packed structure are utilized. An associative flow strength formulation incorporating these yield functions is solved using a geometric normal return method. A stretching rod problem is selected to investigate the effects of material anisotropy on a tensile plastic instability (necking). The rod necking rate and topology are compared for MESA simulations performed for both isotropic and anisotropic cases utilizing the Mechanical Threshold Stress flow stress model.

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8 p.

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Clancy, S.P.; Burkett, M.W. & Maudlin, P.J. May 1, 1997.

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Description

Previously developed constitutive models and solution algorithms for anisotropic elastoplastic material strength are implemented in the two-dimensional MESA hydrodynamics code. Quadratic yield functions fitted from polycrystal simulations for a metallic hexagonal-close-packed structure are utilized. An associative flow strength formulation incorporating these yield functions is solved using a geometric normal return method. A stretching rod problem is selected to investigate the effects of material anisotropy on a tensile plastic instability (necking). The rod necking rate and topology are compared for MESA simulations performed for both isotropic and anisotropic cases utilizing the Mechanical Threshold Stress flow stress model.

Physical Description

8 p.

Notes

OSTI as DE97004993

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  • International conference on mechanical and physical behavior of materials under dynamic loading (EURO/DYMAT), Toledo (Spain), 22-26 Sep 1997

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  • Other: DE97004993
  • Report No.: LA-UR--97-639
  • Report No.: CONF-970944--8
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 515565
  • Archival Resource Key: ark:/67531/metadc695150

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  • May 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 21, 2016, 9:55 p.m.

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Clancy, S.P.; Burkett, M.W. & Maudlin, P.J. Modeling anisotropic plasticity: Eulerian hydrocode applications of high strain-rate deformation processes, article, May 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc695150/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.