Comparison of material flow stress models toward more realistic simulations of friction stir processes of Mg AZ31B

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dc.contributor.author Ammouri, A. H.
dc.contributor.author Hamade, R.F.
dc.date.accessioned 2018-02-27T12:12:59Z
dc.date.available 2018-02-27T12:12:59Z
dc.date.copyright 2013 en_US
dc.date.issued 2018-02-27
dc.identifier.issn 1662-8985 en_US
dc.identifier.uri http://hdl.handle.net/10725/7154
dc.description.abstract Utilizing a proper material model for describing the mechanical behavior of any material is key for a successful simulation of friction stir processing (FSP) where temperature, strain, and strain rate gradients vary abruptly within, and when moving away, from the stirring zone. This work presents a comparison of how faithfully do three different constitutive equations reproduce the state variables of strain, strain rate, and temperature in an FEM simulation of a test-case FSP (1000 rpm spindle speed, and 90 mm/min feed). The three material models considered in this comparison are namely: Johnson-Cook (JC), Sellars-Tegart (ST), and Zerilli-Armstrong (ZA). Constants for these constitutive equations are obtained by fitting these equations to experimental mechanical behavior data collected under a range of strain rates and temperatures of twin-rolled cast wrought AZ31B sheets.It is widely recognized that JC-based models over predicts stress values in the stir zone whereas ST-based models are incapable of capturing work hardening outside of the stir zone. Therefore, a ZA model, being a physical based-HCP specific model, is hereby investigated for its suitability as a material model that would overcome such drawbacks of JC-and ST-based models. The equations from the constitutive models under consideration are fed into an FEM model built using DEFORM 3D to simulate the traverse phases of a friction stir process. Amongst these three material models, comparison results suggest that the HCP-specific ZA model yield better predictions of the state variables: strain, strain rate, and temperature, and, consequently, the estimated values for flow stresses. en_US
dc.language.iso en en_US
dc.title Comparison of material flow stress models toward more realistic simulations of friction stir processes of Mg AZ31B en_US
dc.type Article en_US
dc.description.version Published en_US
dc.author.school SOE en_US
dc.author.idnumber 201306469 en_US
dc.author.department Industrial And Mechanical Engineering en_US
dc.description.embargo N/A en_US
dc.relation.journal Advanced Materials Research en_US
dc.journal.volume 922 en_US
dc.article.pages 18-22 en_US
dc.keywords AZ31B en_US
dc.keywords Constitutive model en_US
dc.keywords Finite element method (FEM) en_US
dc.keywords Friction stir processing en_US
dc.identifier.doi http://dx.doi.org/10.4028/www.scientific.net/AMR.922.18 en_US
dc.identifier.ctation Ammouri, A. H., & Hamade, R. F. (2014). Comparison of Material Flow Stress Models Toward More Realistic Simulations of Friction Stir Processes of Mg AZ31B. In Advanced Materials Research (Vol. 922, pp. 18-22). Trans Tech Publications. en_US
dc.author.email ali.ammouri@lau.edu.lb en_US
dc.identifier.tou http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php en_US
dc.identifier.url https://www.scientific.net/AMR.922.18 en_US
dc.author.affiliation Lebanese American University en_US

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