Print Email Facebook Twitter Modeling high temperature deformation characteristics of AA7020 aluminum alloy using substructure-based constitutive equations and mesh-free approximation method Title Modeling high temperature deformation characteristics of AA7020 aluminum alloy using substructure-based constitutive equations and mesh-free approximation method Author Eivani, A. R. (Iran University of Science and Technology) Vafaeenezhad, H. (Iran University of Science and Technology) Nikan, O. (Iran University of Science and Technology) Zhou, J. (TU Delft Biomaterials & Tissue Biomechanics) Date 2019 Abstract This research was aimed to assess the potential of a radial basis function (RBF) approximation method against the dislocation substructure-based constitutive model in predicting high-temperature deformation behavior of the AA7020 aluminum alloy. Hot compression tests were performed over a range of strain rate of 0.1–100 s−1 and a range of temperature of 350–500 °C up to a strain of 0.6. The hot deformation behavior of the alloy was first described by a substructure kinetic-based constitutive equation, with the effects of strain, strain rate and temperature together with dynamic recovery parameters taken into consideration. A RBF approximation method was then developed to model the flow behavior of the material. The RBF model, as a kind of novel mesh-free function estimation approach, was trained and tested with the obtained datasets from the hot compression tests. The performance of the developed analytical and neural computational models was evaluated using statistical criteria. The results showed that the RBF model was more proficient and accurate in predicting the hot deformation behavior of this aluminum alloy than the substructure-based constitutive model. Subject Aluminum alloyConstitutive equationHot deformationRadial Basis Function To reference this document use: http://resolver.tudelft.nl/uuid:5bb290d1-7743-4d6a-827c-71771547c15a DOI https://doi.org/10.1016/j.mechmat.2018.11.011 Embargo date 2020-11-29 ISSN 0167-6636 Source Mechanics of Materials, 129, 104-112 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2019 A. R. Eivani, H. Vafaeenezhad, O. Nikan, J. Zhou Files PDF Manuscript_revised.pdf 945.04 KB Close viewer /islandora/object/uuid:5bb290d1-7743-4d6a-827c-71771547c15a/datastream/OBJ/view