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Creating an Accurate Microstructurally based RVE of Various Tailor Hot Stamped Material Conditions

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Title: Creating an Accurate Microstructurally based RVE of Various Tailor Hot Stamped Material Conditions
Author: Vowles, Caryn
Department: School of Engineering
Program: Engineering
Advisor: Bardelcik, Alex
Abstract: Most of today’s Body-In-White (BIW) design efforts focus on functionality, light weighting and maintaining safety standards. Tailored hot stamping using the in-die heating technique was introduced to meet these needs. The uniaxial damage behavior of three novel hot stamped tailored material conditions (TMC) was examined at the meso-scale. The grain structure, morphology and distribution are quantified for each TMC using field emission scanning electron microscopy. An experimental methodology was developed to produce a stack of 2D high resolution micrographs at a consistent location. This data was used to develop accurate 3D representative volume element (RVE) models. The RVEs simulated a uniaxial loading condition and included cohesive zone elements to model decohesion and the Gurson material model to simulate void growth. The results identified that an accurate representation of grain morphology must be considered in order to predict the damage mechanisms. The RVEs predicted the observed experimental damage modes for these particular TMCs. The effect of the individual phases on strain partitioning was shown to influence the damage process by increasing the strain in ferrite. The results of this work have the potential to predict the micro-mechanical damage behavior of multi-phase steels.
URI: http://hdl.handle.net/10214/14778
Date: 2018-12
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