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DISLOCATION MECHANICS BASED ANALYSIS OF MATERIAL DYNAMICS BEHAVIOR

Abstract : Grain size dependent twinning stress measurements reported for Armco iron and carbon steel materials give a high strain rate transition to twinning from the slip behavior described by a dislocation mechanics based constitutive equation analysis. Consequent model calculations of deformation twinning in a cylindrical impact (Taylor) test result are compared with results reported in the original Taylor test experiments. For copper polycrystals , dislocation drag and grain size effects incorporated within a dislocation mechanics based constitutive model analysis show agreement with results reported recently from expanding ring test experiments. The different (bcc) α-iron and (fcc) copper equations are shown to fit α-iron and copper tensile impact results reported in a pioneering study by von Karman and Duwez. Basic differences in the bcc and fcc constitutive behaviors produce important differences in the tensile plastic instability properties of these materials preceding the onset of ductile fracturing.
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https://hal.archives-ouvertes.fr/jpa-00227797
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Submitted on : Friday, January 1, 1988 - 8:00:00 AM
Last modification on : Friday, January 1, 1988 - 8:00:00 AM
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R. Armstrong, F. Zerilli. DISLOCATION MECHANICS BASED ANALYSIS OF MATERIAL DYNAMICS BEHAVIOR. Journal de Physique Colloques, 1988, 49 (C3), pp.C3-529-C3-534. ⟨10.1051/jphyscol:1988374⟩. ⟨jpa-00227797⟩

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