About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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In Tribute to Robert Wagoner: A Pioneer in Metal Forming and Constitutive Modeling
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| Presentation Title |
Improving the Constitutive Modeling of AA2618 Through Strain Rate Jump Testing and Parameter Optimization |
| Author(s) |
Okechukwu C Obioha, Christopher A Calhoun, Yateendra Guthula, Matthew H Steiner, Eric J. Payton |
| On-Site Speaker (Planned) |
Eric J. Payton |
| Abstract Scope |
Improved modeling of the flow response of aluminum alloys is needed for quality control during forging of components in aerospace and automotive applications. In this work, the flow behavior of aluminum alloy 2618 during plastic deformation in the range of 300-450 °C is characterized under strain rates between 0.001/s and 1.0/s using strain rate jump compression tests on a Gleeble 3500 thermomechanical tester. Nonlinear optimization is used to fit model parameters to the experimental observations. Several constitutive models are considered, including Johnson-Cook, Power law, and Arrhenius-type. The Lin-Wagoner model provides an accurate reproduction of the stress-strain behavior under transient strain rate conditions if the “A” parameter (corresponding to yield strength at the reference condition) is allowed to vary linearly with temperature. The flow stress response is rationalized through characterization of microstructure after deformation under different strain rate and temperature conditions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Shaping and Forming, |