Journal
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Volume 51, Issue 1, Pages 93-110Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2013.09.015
Keywords
Weakening; Nickel-base superalloy; Finite element; High strain rate; Constitutive equations
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Funding
- Secretaria de Estado de Investigacion, Desarrollo e Innovacion of the Ministerio de Economia y Competitividad [BIA2011-24445]
- Structural Impact Laboratory (SIMLab)
- Centre for Research-based Innovation (CRI) at the Norwegian University of Science and Technology (NTNU)
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A coupled elastoplastic-damage constitutive model with Lode angle dependent failure criterion for high strain and ballistic applications is presented. A Lode angle dependent function is added to the equivalent plastic strain to failure definition of the Johnson-Cook failure criterion. The weakening in the elastic law and in the Johnson-Cook-like constitutive relation implicitly introduces the Lode angle dependency in the elastoplastic behaviour. The material model is calibrated for precipitation hardened Inconel 718 nickel-base superalloy. The combination of a Lode angle dependent failure criterion with weakened constitutive equations is proven to predict fracture patterns of the mechanical tests performed and provide reliable results. Additionally, the mesh size dependency on the prediction of the fracture patterns was studied, showing that was crucial to predict such patterns. (C) 2013 Elsevier Ltd. All rights reserved.
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