Material-dependent representative plastic strain for the prediction of indentation hardness / Nathan A. Branch in Acta materialia, Vol. 58 N° 19 (Novembre 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 19 (Novembre 2010) . - pp. 6487–6494 Titre : Material-dependent representative plastic strain for the prediction of indentation hardness Type de document : texte imprimé Auteurs : Nathan A. Branch, Auteur ; Ghatu Subhash, Auteur ; Nagaraj K. Arakere, Auteur Année de publication : 2011 Article en page(s) : pp. 6487–6494 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Representative plastic strain Hardness Plastic deformation Finite element modeling Résumé : The definition of representative plastic strain induced by a Vickers indent has received considerable attention in recent years. Previous reports have attempted to define a universal value that was independent of a material’s plastic response. However, the work presented here will show that a material-dependent representative plastic strain is valid in the conversion of flow stress to indentation hardness. This representative plastic strain is the volume average plastic strain within the plastic zone of Vickers indentation. The increase in indentation hardness within the plastic zones of macro-indents was experimentally determined by micro-Vickers indentation and then compared with that predicted by finite element modeling, which utilizes the proposed representative plastic strain. It was further shown that the representative plastic strain defined here is independent of yield strength, elastic modulus and magnitude of prior plastic deformation for both linear and power law strain hardening materials. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410005240 [article] Material-dependent representative plastic strain for the prediction of indentation hardness [texte imprimé] / Nathan A. Branch, Auteur ; Ghatu Subhash, Auteur ; Nagaraj K. Arakere, Auteur . - 2011 . - pp. 6487–6494. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 19 (Novembre 2010) . - pp. 6487–6494 Mots-clés : Representative plastic strain Hardness Plastic deformation Finite element modeling Résumé : The definition of representative plastic strain induced by a Vickers indent has received considerable attention in recent years. Previous reports have attempted to define a universal value that was independent of a material’s plastic response. However, the work presented here will show that a material-dependent representative plastic strain is valid in the conversion of flow stress to indentation hardness. This representative plastic strain is the volume average plastic strain within the plastic zone of Vickers indentation. The increase in indentation hardness within the plastic zones of macro-indents was experimentally determined by micro-Vickers indentation and then compared with that predicted by finite element modeling, which utilizes the proposed representative plastic strain. It was further shown that the representative plastic strain defined here is independent of yield strength, elastic modulus and magnitude of prior plastic deformation for both linear and power law strain hardening materials. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410005240

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