Papers by Vincent Prantil
2004 Annual Conference Proceedings
Finite element analysis (FEA) has become an essential tool in the product design process of many ... more Finite element analysis (FEA) has become an essential tool in the product design process of many companies. A course in FEA is required in a large number of mechanical engineering and mechanical engineering technology curricula. Most FEA courses necessarily include some balance of theory and practical use of a commercial FEA program. In a course recently developed at Milwaukee School of Engineering, another element has been added to the FEA class in the Mechanical Engineering Technology Program: a mechanics of materials laboratory in which physical experiments are conducted to support the analysis exercises. In this paper, the course content will be discussed, with emphasis on the specific lab exercises that allow measured results to be compared to FEA results.
2018 ASEE Annual Conference & Exposition Proceedings
Journal of the Mechanics and Physics of Solids, 2015
ABSTRACT
Large Plastic Deformations
Sustainability
Many game-based instructional designs have demonstrated effectiveness for a variety of educationa... more Many game-based instructional designs have demonstrated effectiveness for a variety of educational outcomes, although typically in limited contexts. In this article, we report the results of a four-year study testing the extent to which a game-based learning approach to undergraduate engineering education demonstrating promising results in a university course was transportable to other engineering courses and universities. We evaluated students’ conceptual understanding, emotional engagement (with the Experience Sampling Method), and experience when using the video game, Spumone, for their coursework compared to a textbook-based control condition. Multilevel models and other quantitative analyses showed that the effect of the experimental condition (i.e., game-based) on conceptual understanding and student engagement was not significant. Based on a content analysis of students’ feedback, however, the students reported a positive experience with game-based learning for their assignme...
2013 ASEE Annual Conference & Exposition Proceedings
2011 ASEE Annual Conference & Exposition Proceedings
Volume 13: Acoustics, Vibration, and Wave Propagation, 2016
An internal state variable formulation for phase transforming alloy steels is presented. We have ... more An internal state variable formulation for phase transforming alloy steels is presented. We have illustrated how local transformation plasticity can be accommodated by an appropriate choice for the corresponding internal stress field acting between the phases. The state variable framework compares well with a numerical micromechanical calculation providing a discrete dependence of microscopic plasticity on volume fraction and the stress
Sandia is a multiprogrsm l~boratory operated by Sandi{Corporation, a Lookheed Martin Company, for... more Sandia is a multiprogrsm l~boratory operated by Sandi{Corporation, a Lookheed Martin Company, for the United States Department of Energy under Contract'DE-AC(J4-94AL85000. ./ 1 ,' z~-d-for public releasq further dissemination unlimited. Issuedby SandiaNationalLaboratories,operatedfor the UnitedStatesDepartment of Energyby Sandia Corporation.
EPJ Web of Conferences
We present a micro-mechanical model that is able to predict localization in a sheared planar aggr... more We present a micro-mechanical model that is able to predict localization in a sheared planar aggregate of spheres. We assume a non-linear contact law between interacting particles that deform differently from an affine deformation. Equilibrium determines this deviation. The aggregate is isotropically compressed and then sheared so anisotropy develops because of contacts deletion and a non-linear contact law. Because of anisotropy and fluctuations in particles deformation, the resulting macroscopic stiffness tensor, which relates increments in the average stress with increments in the average strain, is characterized by a lack of major symmetry, A i jkl A kli j. At given shear strain and coordination number it is possible to detemine a plane over which discontinuity in strain occurs; this is identified as localization.
Materials Science Forum, 2000
The residual stress profile in a hardened layer of steel was measured and then compared with a fi... more The residual stress profile in a hardened layer of steel was measured and then compared with a finite element prediction. A thick ring made of low alloy gear steel was case hardened by carburization and quenching. The residual hoop stress variation in the 1 mm thick hardened layer was measured using the crack compliance method, in which surface strains are measured as an axial slot is incrementally extended from the outer surface inward using wire electric discharge machining (EDM). The surface residual stresses were also measured using x-ray diffraction. The results compared very well with finite element predictions using DANTE, a heat treatment simulation software package interfacing with the finite element code ABAQUS. The heat treatment cycle is simulated in an uncoupled serial analysis of carburization by diffusion, quenching by conduction and convection including phase transformation kinetics, and finally a structural analysis incorporating TRansformation-Induced Plasticity (TRIP). Accurate residual stress profiles require detailed knowledge of the heat transfer coefficients of the quench media as well as alloy-dependent descriptions for phase transformation kinetics and TRIP strains.
Materials Science Forum, 2000
The residual stress profile in a hardened layer of steel was measured and then compared with a fi... more The residual stress profile in a hardened layer of steel was measured and then compared with a finite element prediction. A thick ring made of low alloy gear steel was case hardened by carburization and quenching. The residual hoop stress variation in the 1 mm thick hardened layer was measured using the crack compliance method, in which surface strains are measured as an axial slot is incrementally extended from the outer surface inward using wire electric discharge machining (EDM). The surface residual stresses were also measured using x-ray diffraction. The results compared very well with finite element predictions using DANTE, a heat treatment simulation software package interfacing with the finite element code ABAQUS. The heat treatment cycle is simulated in an uncoupled serial analysis of carburization by diffusion, quenching by conduction and convection including phase transformation kinetics, and finally a structural analysis incorporating TRansformation-Induced Plasticity (TRIP). Accurate residual stress profiles require detailed knowledge of the heat transfer coefficients of the quench media as well as alloy-dependent descriptions for phase transformation kinetics and TRIP strains.
The final report for a Laboratory Directed Research and Development project entitled, ``Capturing... more The final report for a Laboratory Directed Research and Development project entitled, ``Capturing Recrystallization of Metals in a Multiscale Materials Model'' is presented. In this project, deformation and recrystallization processes have been followed experimentally and theoretically in order to incorporate essential mechanisms from the defect (dislocation) and grain size length scales. A nonlinear rotational gradient theory has been developed which
Finite element analysis (FEA) courses are included in many undergraduate engineering curricula. I... more Finite element analysis (FEA) courses are included in many undergraduate engineering curricula. In most of these courses, a mix of mathematical theory and the use of a commercial software package are presented. However, most classes do not have a physical laboratory component. The comparison of analysis results to physical tests can be an important element in learning about the capabilities and limitations of the finite element method. In this paper, the authors describe a project in which physical tests are performed and documented for use in FEA courses. As the project progresses, the authors intend to develop a library of these virtual laboratory experiences, and to encourage other instructors to use and add to the library.
Modelling and Simulation in Materials Science and Engineering, 1995
Polycrystal plasticity models often require a description of single-crystal behavior that is link... more Polycrystal plasticity models often require a description of single-crystal behavior that is linked in some way to the macroscopic behavior of the aggregate. Often the appropnate choice of such a mean field hypothesis depends on the crystal class and the rote sensitivity of dislocation slip. Here, we compare a class of equilibrium-based models with a hybrid formulation developed for system with internal constnints. The response of a consumed HCP polycrystal is modeled in the absence of pyramidal slip and twinning so the crystal c-axis becomes inextensible. The inherent inhomogeneity of the deformation over the aggregate is accommodated differently by the two approaches. The constrained hybrid formulation developed by Parks and Ahd and cast partially in analytical form by Pmtil el nl prescribes the partitioning of deformation among the individual crystals using a kinematic rule that. crystal by crystal. filters out the component of the motion in each crystal's constraint direction. This p a t of the motion must then be sustained by neighboring crystals which are more favorably oriented. The equilibrium-based formulations expliciQ satisfy intergranular equilibrium by assuming that all crystals experience the macroscopic stress. The magnitude of this stress is determined by enforcing the average crystal deformation to be equal to the macroscopically rmposed motion.
Synthesis Lectures on Engineering, 2015
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Papers by Vincent Prantil