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Deformation Response and Formability Limit Diagram Estimates of Dual-Phase Steels

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Title: Deformation Response and Formability Limit Diagram Estimates of Dual-Phase Steels
Author: Espinosa, Esteban
Department: School of Engineering
Program: Engineering
Advisor: Simha, Hari
Abstract: New Dual-Phase (DP) steel sheet with desirable mechanical properties are developed using trialand-error methods that are time-consuming and expensive. Using only micro-structural information, methods to predict stress-strain under tension, reverse yield under compression following tensile loading, and a lower-bound formability limit diagram (FLD) are developed. Mean-field models were used to obtain the flow behavior of the composite under uni-axial loading and reverse yielding, and also serve as descriptors of stress-strain behavior of the ferrite and martensite phases in the finite element models. Representative Volume Elements (RVEs) of the steel were used for the creation of a morphologically realistic Finite Element Model, which in turn allows prediction of flow behavior under uni-axial and plane strain loading. The latter allows estimation of the FLD using the Marciniak-Kuczynski (M-K) and Modified Maximum Force Criterion (MMFC) approaches. Computations with the RVE models afford insights into the relationship between the microstructure and mechanical properties.
URI: https://hdl.handle.net/10214/25657
Date: 2021-04-28
Rights: Attribution-NoDerivatives 4.0 International
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Attribution-NoDerivatives 4.0 International Except where otherwise noted, this item's license is described as Attribution-NoDerivatives 4.0 International