| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
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| Symposium
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2024 Graduate Student Poster Contest
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| Presentation Title |
SPG-45: Improved Constitutive Descriptions of the Flow Behavior of Aluminum Alloy 2618 |
| Author(s) |
Okechukwu C. Obioha, Joseph Kolar, Phillisity Neal, Jesus Acosta , Netsanet Thompson , Matthew Steiner, Christopher Calhoun, Eric Payton |
| On-Site Speaker (Planned) |
Okechukwu C. Obioha |
| Abstract Scope |
The constitutive behavior of aluminum alloy 2618 in compression was investigated across a range of temperatures and strain rates typical to forging processes using a Gleeble 3500 thermo-mechanical simulator. The true stress-true strain curves exhibit a peak stress at a small strain, after which the flow stress decreases with decreasing strain rate and increasing temperature. Microstructure was characterized before and after deformation under different conditions. Nonlinear optimization algorithms were employed to compare and contrast microstructure-aware and phenomenological (microstructure-unaware) relationships for flow behavior, aiming to develop a new subroutine for FEM prediction of closed-die forging. The role of calibrating adiabatic heating parameters on microstructure-aware modeling is a major point of emphasis. Finally, the practical implications of model choice and parameterization will be discussed, highlighting the consequences of constitutive model choice and parameterization on formability and flash production.
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