A Modified JC Constitutive Equation for 5052 Aluminum with 0.3 mm Thickness Considering Loading Rate Effect at Quasi-Static Range

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Ashrafian, Mohammad Mahdi | 2013

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45279 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Hosseini Kordkheili, Ali
Abstract:
In this thesis, both experimental and numerical approaches are conducted to present a constitutive equation for 5052 aluminum diaphragms under quasi-static strain rate loadings. For this purpose the stress-strain curves at different strain rates are obtained using tensile tests. Brittle behavior during tensile tests is observed due to samples thin thicknesses. Employing Johnson-Cook constitutive equation no yields in reasonable agreement with these tensile tests results. Therefore, developing a more suitable constitutive equation for aluminum diaphragms is taken into consideration. This equation is then implemented into the commercial finite element software, ABAQUS, via a developed user material (UMAT) subroutine utilizing von Mises plasticity theory and an own solution algorithm. A single-element pathological test method is adopted to show the well-development of the UMAT subroutine. In order to verify the proposed constitutive equation to precision predicting of mechanical behavior, a bulge test is performed in which demonstrates a good agreement between experimental and numerical results
Keywords:
Aluminum Blank ; Stress-Strain Diagrams ; Johnson-Cook Model ; Constitutive Equations ; Von Mises Plasticity Theory ; UMAT Subroutine

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