The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform

A J Barnes - One of the best experts on this subject based on the ideXlab platform.

  • Superplastic Forming 40 Years and Still Growing
    Journal of Materials Engineering and Performance, 2007
    Co-Authors: A J Barnes
    Abstract:

    In late 1964 Backofen, Turner & Avery, at MIT, published a paper in which they described the “extraordinary formability” exhibited when fine-grain zinc-aluminum eutectoid (Zn 22 Al) was subjected to bulge testing under appropriate conditions. They concluded their research findings with the following insightful comment “ even more appealing is the thought of applying to superplastic metals Forming Techniques borrowed from polymer and glass processing. ” Since then their insightful thought has become a substantial reality with thousands of tons of metallic sheet materials now being superplastically formed each year. This paper reviews the significant advances that have taken place over the past 40 years including alloy developments, improved Forming Techniques and equipment, and an ever increasing number of commercial applications. Current and likely future trends are discussed including; applications in the aerospace and automotive markets, faster-Forming Techniques to improve productivity, the increasing importance of computer modeling and simulation in tool design and process optimization and new alloy developments including superplastic magnesium alloys.

  • superplastic Forming 40 years and still growing
    Journal of Materials Engineering and Performance, 2007
    Co-Authors: A J Barnes
    Abstract:

    In late 1964 Backofen, Turner & Avery, at MIT, published a paper in which they described the “extraordinary formability” exhibited when fine-grain zinc-aluminum eutectoid (Zn 22 Al) was subjected to bulge testing under appropriate conditions. They concluded their research findings with the following insightful comment “even more appealing is the thought of applying to superplastic metals Forming Techniques borrowed from polymer and glass processing.” Since then their insightful thought has become a substantial reality with thousands of tons of metallic sheet materials now being superplastically formed each year. This paper reviews the significant advances that have taken place over the past 40 years including alloy developments, improved Forming Techniques and equipment, and an ever increasing number of commercial applications. Current and likely future trends are discussed including; applications in the aerospace and automotive markets, faster-Forming Techniques to improve productivity, the increasing importance of computer modeling and simulation in tool design and process optimization and new alloy developments including superplastic magnesium alloys.

John W. Halloran - One of the best experts on this subject based on the ideXlab platform.

  • Photopolymerization of powder suspensions for shaping ceramics
    Journal of the European Ceramic Society, 2011
    Co-Authors: John W. Halloran, Vladislava Tomeckova, Susan P. Gentry, Suman Das, Paul Cilino, Dajun Yuan, Rui Guo, Andirudh Rudraraju, Peng Shao
    Abstract:

    Abstract The photopolymerization of suspensions of ceramic powders in monomer solutions is the fundamental step for Forming Techniques where a liquid suspension is solidified with UV light. The photopolymerization behavior is determined by the properties of the monomer and photoinitiator and by the transport of photons in the suspension. Photon transport in suspensions involves scattering from the particle and absorption by photoinitiators and inert dyes. The photopolymerization behavior is related to the formulation of the suspensions. Proper formulations are discussed for several applications. Techniques for characterization include cure depth measurements, photocalorimetry, and photorheology.

  • predictive models for the photopolymerization of ceramic suspensions
    Journal of The European Ceramic Society, 2010
    Co-Authors: Vladislava Tomeckova, John W. Halloran
    Abstract:

    The photopolymerization of suspensions of ceramic powders in monomer solutions is the fundamental step in several rapid prototyping Forming Techniques based on photocuring. Exposure to an UV dose of energy E causes the monomer to be polymerized to a certain cure depth, with the relation between cure depth and energy dose dependant on two properties of the photosuspension, the sensitivity and the critical energy dose. We present simple models for sensitivity in terms of the attenuation of the UV beam by absorption and scattering, and demonstrate the applicability of the model with experimental data for a UV laser, UV lamps and direct spectrophotometry. We also present a model for the critical energy dose in terms of the relative number of photo-generated radicals and the concentration of inhibitors.

Yungho Kim - One of the best experts on this subject based on the ideXlab platform.

  • fundamental studies on the incremental sheet metal Forming technique
    Journal of Materials Processing Technology, 2003
    Co-Authors: Jongjin Park, Yungho Kim
    Abstract:

    Abstract The idea of incremental Forming technique has been investigated for production of sheet metal components. With this technique, the Forming limit curve (FLC) appears in a different pattern, revealing an enhanced formability, compared to conventional Forming Techniques. In the present study, the formability of an aluminum sheet under various Forming conditions was assessed and difficult-to-form shapes were produced with the technique. By utilizing knowledge and experience obtained during the present study, it became possible to produce some free surfaces.

Vladislava Tomeckova - One of the best experts on this subject based on the ideXlab platform.

  • Photopolymerization of powder suspensions for shaping ceramics
    Journal of the European Ceramic Society, 2011
    Co-Authors: John W. Halloran, Vladislava Tomeckova, Susan P. Gentry, Suman Das, Paul Cilino, Dajun Yuan, Rui Guo, Andirudh Rudraraju, Peng Shao
    Abstract:

    Abstract The photopolymerization of suspensions of ceramic powders in monomer solutions is the fundamental step for Forming Techniques where a liquid suspension is solidified with UV light. The photopolymerization behavior is determined by the properties of the monomer and photoinitiator and by the transport of photons in the suspension. Photon transport in suspensions involves scattering from the particle and absorption by photoinitiators and inert dyes. The photopolymerization behavior is related to the formulation of the suspensions. Proper formulations are discussed for several applications. Techniques for characterization include cure depth measurements, photocalorimetry, and photorheology.

  • predictive models for the photopolymerization of ceramic suspensions
    Journal of The European Ceramic Society, 2010
    Co-Authors: Vladislava Tomeckova, John W. Halloran
    Abstract:

    The photopolymerization of suspensions of ceramic powders in monomer solutions is the fundamental step in several rapid prototyping Forming Techniques based on photocuring. Exposure to an UV dose of energy E causes the monomer to be polymerized to a certain cure depth, with the relation between cure depth and energy dose dependant on two properties of the photosuspension, the sensitivity and the critical energy dose. We present simple models for sensitivity in terms of the attenuation of the UV beam by absorption and scattering, and demonstrate the applicability of the model with experimental data for a UV laser, UV lamps and direct spectrophotometry. We also present a model for the critical energy dose in terms of the relative number of photo-generated radicals and the concentration of inhibitors.

Peng Shao - One of the best experts on this subject based on the ideXlab platform.

  • Photopolymerization of powder suspensions for shaping ceramics
    Journal of the European Ceramic Society, 2011
    Co-Authors: John W. Halloran, Vladislava Tomeckova, Susan P. Gentry, Suman Das, Paul Cilino, Dajun Yuan, Rui Guo, Andirudh Rudraraju, Peng Shao
    Abstract:

    Abstract The photopolymerization of suspensions of ceramic powders in monomer solutions is the fundamental step for Forming Techniques where a liquid suspension is solidified with UV light. The photopolymerization behavior is determined by the properties of the monomer and photoinitiator and by the transport of photons in the suspension. Photon transport in suspensions involves scattering from the particle and absorption by photoinitiators and inert dyes. The photopolymerization behavior is related to the formulation of the suspensions. Proper formulations are discussed for several applications. Techniques for characterization include cure depth measurements, photocalorimetry, and photorheology.