The Experts below are selected from a list of 147 Experts worldwide ranked by ideXlab platform

Ales Svoboda - One of the best experts on this subject based on the ideXlab platform.

  • Simulation of Metal cutting using the particle finite-element method and a physically based plasticity model
    Computational Particle Mechanics, 2017
    Co-Authors: J. M. Rodríguez, Pär Jonsén, Ales Svoboda
    Abstract:

    Metal cutting is one of the most common Metal-Shaping processes. In this process, specified geometrical and surface properties are obtained through the break-up of material and removal by a cutting edge into a chip. The chip formation is associated with large strains, high strain rates and locally high temperatures due to adiabatic heating. These phenomena together with numerical complications make modeling of Metal cutting difficult. Material models, which are crucial in Metal-cutting simulations, are usually calibrated based on data from material testing. Nevertheless, the magnitudes of strains and strain rates involved in Metal cutting are several orders of magnitude higher than those generated from conventional material testing. Therefore, a highly desirable feature is a material model that can be extrapolated outside the calibration range. In this study, a physically based plasticity model based on dislocation density and vacancy concentration is used to simulate orthogonal Metal cutting of AISI 316L. The material model is implemented into an in-house particle finite-element method software. Numerical simulations are in agreement with experimental results, but also with previous results obtained with the finite-element method.

  • Numerical modeling of Metal cutting processes using the particle finite element method (PFEM) and a physically based plasticity model
    2015
    Co-Authors: Juan Manuel Rodriguez Prieto, Pär Jonsén, Ales Svoboda
    Abstract:

    Metal cutting is one of the most common Metal Shaping processes. Specified geometrical and surface properties are obtained by break-up of material and removal by a cutting edge into a chip. The chi ...

  • Simulation of Metal cutting using a physically based plasticity model
    Modelling and Simulation in Materials Science and Engineering, 2010
    Co-Authors: Ales Svoboda, Dan Wedberg, Lars-erik Lindgren
    Abstract:

    Metal cutting is one of the most common Metal Shaping processes. Specified geometrical and surface properties are obtained by break-up of the material removed by the cutting edge into a chip. The c ...

Jason Heikenfeld - One of the best experts on this subject based on the ideXlab platform.

  • reconfigurable liquid Metal circuits by laplace pressure Shaping
    Applied Physics Letters, 2012
    Co-Authors: Brad L. Cumby, Gerard J. Hayes, Michael D. Dickey, Ryan S. Justice, Christopher E. Tabor, Jason Heikenfeld
    Abstract:

    We report reconfigurable circuits formed by liquid Metal Shaping with <10 pounds per square inch (psi) Laplace and vacuum pressures. Laplace pressure drives liquid Metals into microreplicated trenches, and upon release of vacuum, the liquid Metal dewets into droplets that are compacted to 10–100× less area than when in the channel. Experimental validation includes measurements of actuation speeds exceeding 30 cm/s, simple erasable resistive networks, and switchable 4.5 GHz antennas. Such capability may be of value for next generation of simple electronic switches, tunable antennas, adaptive reflectors, and switchable metamaterials.

  • Reconfigurable liquid Metal circuits by Laplace pressure Shaping
    Applied Physics Letters, 2012
    Co-Authors: Brad L. Cumby, Gerard J. Hayes, Michael D. Dickey, Ryan S. Justice, Christopher E. Tabor, Jason Heikenfeld
    Abstract:

    We report reconfigurable circuits formed by liquid Metal Shaping with

J. M. Rodríguez - One of the best experts on this subject based on the ideXlab platform.

  • Simulation of Metal cutting using the particle finite-element method and a physically based plasticity model
    Computational Particle Mechanics, 2017
    Co-Authors: J. M. Rodríguez, Pär Jonsén, Ales Svoboda
    Abstract:

    Metal cutting is one of the most common Metal-Shaping processes. In this process, specified geometrical and surface properties are obtained through the break-up of material and removal by a cutting edge into a chip. The chip formation is associated with large strains, high strain rates and locally high temperatures due to adiabatic heating. These phenomena together with numerical complications make modeling of Metal cutting difficult. Material models, which are crucial in Metal-cutting simulations, are usually calibrated based on data from material testing. Nevertheless, the magnitudes of strains and strain rates involved in Metal cutting are several orders of magnitude higher than those generated from conventional material testing. Therefore, a highly desirable feature is a material model that can be extrapolated outside the calibration range. In this study, a physically based plasticity model based on dislocation density and vacancy concentration is used to simulate orthogonal Metal cutting of AISI 316L. The material model is implemented into an in-house particle finite-element method software. Numerical simulations are in agreement with experimental results, but also with previous results obtained with the finite-element method.

Giuseppe Ingarao - One of the best experts on this subject based on the ideXlab platform.

  • Tuning Decision Support Tools for Environmentally Friendly Manufacturing Approach Selection
    Sustainable Design and Manufacturing 2017, 2017
    Co-Authors: Giuseppe Ingarao, Paolo Claudio Priarone, Yelin Deng, Rosa Di Lorenzo
    Abstract:

    Awareness about the environmental performance of manufacturing approaches has arisen. Comparative analyses of different manufacturing approaches as well as decision support methods should be developed in the field of Metal Shaping processes. The present paper aims at tuning a decision support tool for identifying when mass conserving approaches (forming based) are actually preferable over machining processes for manufacturing aluminum based components. A full LCA is developed for comparing the environmental performance of forming and machining approaches as the batch size and geometry complexity hang. The impact of the used metric on the comparative results is analyzed. Results reveal that primary energy can be used as reliable metric for identifying environmentally friendly manufacturing processes.

  • Manufacturing strategies for efficiency in energy and resources use: The role of Metal Shaping processes
    Journal of Cleaner Production, 2017
    Co-Authors: Giuseppe Ingarao
    Abstract:

    Abstract Manufacturing sector nowadays has to deal with the global need to reduce the environmental impact of human activity. As manufacturing accounts for a significant portion of the global CO 2 emissions, scientific research should be addressed to understand the environmental impact of manufacturing processes and, in the meantime, to take advantage of their full potential in reducing the overall CO 2 emissions. The present review paper aims at describing the role of Metal Shaping processes in reducing the environmental impact across different stages of Metal components life. Actually, an increased consciousness concerning both the environmental performances of manufacturing processes and their potential to enable circular economy practices can uncover and unlock new energy and resource efficiency strategies. Besides the straightforward role in the manufacturing stage, the impact of these processes in others life stages (mainly material production and End-of-life) is analyzed. The review paper aims both at outlining the already developed scientific research in the domain of energy and resource efficiency and at highlighting the role of Metal Shaping processes in putting in place energy and resource efficient manufacturing strategies. Concerning the unit process level, quantified improvements in environmental indicators with varying processes parameters, machine tools architectures, used process and manufacturing approach itself have been analyzed. As far as material efficiency is concerned, both innovative recycling as well as reuse strategies (remanufacturing, reshape and relocate) implemented by means of Metal Shaping processes are described. The idea is to provide a comprehensive picture of environmental aspects of Metal Shaping processes analyzing the developed scientific research, looking at them from a new perspectives and outlining research needs.

  • A methodology for evaluating the influence of batch size and part geometry on the environmental performance of machining and forming processes
    Journal of Cleaner Production, 2016
    Co-Authors: Giuseppe Ingarao, Paolo Claudio Priarone, Rosa Di Lorenzo, Luca Settineri
    Abstract:

    Metallic material processing plays a significant role in terms of global environmental impact. As a result, energy- and resource-efficient strategies in the Metal Shaping technology domain need to be identified urgently. Recently, the scientific world has been paying more and more attention to the environmental impact analysis of manufacturing processes. Despite this increased attention, the state of the art in the domain of environmental impact analysis of Metal Shaping processes is still characterized by gaps in knowledge and in methodologies. In particular, Metal forming processes are still not well documented, in terms of their environmental impact, and there is a lack of systematic and comparative approaches. This paper offers a contribution to a better understanding of the environmental impact of forming and machining processes. A thorough methodology has been developed to take into due account all the environmental factors of influence on both of the considered technologies. A comparative analysis has been performed, varying the production batch size and part geometry. The importance of an environmental performance analysis that can include both batch size and geometry variations is discussed and highlighted throughout the paper. Finally, the application of the proposed methodology has resulted in the setting up of an eco-design tool, here defined as a Process Sustainability Diagram (PSD), which allows the greenest technology to be selected for the analyzed case study, while varying the considered factors of influence.

  • Subtractive versus mass conserving Metal Shaping technologies: an environmental impact comparison
    Journal of Cleaner Production, 2015
    Co-Authors: Giuseppe Ingarao, Paolo Claudio Priarone, Francesco Gagliardi, Rosa Di Lorenzo, Luca Settineri
    Abstract:

    Abstract The scientific studies in the domain of environmental sustainability of Metal processing technologies predominantly focus on conventional material removal processes, as milling and turning. Despite some exceptions, many other non-machining technologies, such as Metal forming processes, are still not well documented in terms of their energy and resource efficiency. Moreover, to properly evaluate the environmental impact of a given process, a standing-alone approach is no longer sufficient. In order to offer a valuable contribution in the domain of Metal Shaping sustainability, the present paper proposes a thorough methodology entailing to compare, from the environmental point of view, two traditional technologies: a hot extrusion process (mass conserving approach) and a turning (subtractive) one. A Life Cycle Assessment (LCA) based approach is implemented to properly analyze the considered processes. An axi-symmetric aluminum component was selected to develop the analysis on. Besides the analysis of material flows occurring all along the life cycle of the component, the material use and the consumed electrical energy necessary for the tools manufacturing are measured to properly quantify the environmental impact of the production phases. The most relevant influencing factors within each technology are identified and quantified. Moreover, an analysis of the environmental performance of the two processes at the varying of the batch size is presented. The paper aims at providing some general guidelines for the identification of the greenest technology as the main influencing factors change.

Brad L. Cumby - One of the best experts on this subject based on the ideXlab platform.

  • reconfigurable liquid Metal circuits by laplace pressure Shaping
    Applied Physics Letters, 2012
    Co-Authors: Brad L. Cumby, Gerard J. Hayes, Michael D. Dickey, Ryan S. Justice, Christopher E. Tabor, Jason Heikenfeld
    Abstract:

    We report reconfigurable circuits formed by liquid Metal Shaping with <10 pounds per square inch (psi) Laplace and vacuum pressures. Laplace pressure drives liquid Metals into microreplicated trenches, and upon release of vacuum, the liquid Metal dewets into droplets that are compacted to 10–100× less area than when in the channel. Experimental validation includes measurements of actuation speeds exceeding 30 cm/s, simple erasable resistive networks, and switchable 4.5 GHz antennas. Such capability may be of value for next generation of simple electronic switches, tunable antennas, adaptive reflectors, and switchable metamaterials.

  • Reconfigurable liquid Metal circuits by Laplace pressure Shaping
    Applied Physics Letters, 2012
    Co-Authors: Brad L. Cumby, Gerard J. Hayes, Michael D. Dickey, Ryan S. Justice, Christopher E. Tabor, Jason Heikenfeld
    Abstract:

    We report reconfigurable circuits formed by liquid Metal Shaping with