Zobrazeno 1 - 10
of 53
pro vyhledávání: '"Robert J. Dowding"'
Autor:
Clara Mock, Jeffrey J. Swab, Robert J. Dowding, Anindya Ghoshal, William Gamble, Christopher Rowe, Robert Pegg, Marc Pepi, Dongming Zhu, Michael J. Walock, Blake Barnett, Muthuvel Murugan, Luis Bravo, Andy Nieto, Kevin A. Kerner, Mark Graybeal, Samuel G. Hirsch
Publikováno v:
2018 Joint Propulsion Conference.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::08f26a7e719e92cd96c97d44880c9040
https://doi.org/10.2514/6.2018-4831
https://doi.org/10.2514/6.2018-4831
Autor:
Laszlo J. Kecskes, Qiuming Wei, K.T. Ramesh, Karl T. Hartwig, Suveen N. Mathaudhu, Robert J. Dowding, Brian E. Schuster
Publikováno v:
Materials Science and Engineering: A. 493:58-64
We have investigated the dynamic mechanical behaviors of representative body-centered cubic (b.c.c.) refractory metals with ultrafine grained (UFG, grain size (d) smaller than 500 nm, but larger than 100 nm) and nanocrystalline (NC, d smaller than 10
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8e6fa375aa918cdf8c6a473a46f60ad1
https://doi.org/10.1016/j.msea.2007.05.126
https://doi.org/10.1016/j.msea.2007.05.126
Autor:
Laszlo J. Kecskes, Robert J. Dowding, Qiuming Wei, Kyu Cho, Ruslan Z. Valiev, Brian E. Schuster
Publikováno v:
Materials Science and Engineering: A. 467:33-43
We have used two general methodologies for the production of ultrafine grained (UFG) and nanocrystalline (NC) tungsten (W) metal samples: top-down and bottom-up. In the first, Equal channel angular extrusion (ECAE), coupled with warm rolling has been
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::653604a2ed6fcfe5f338943cccaf4c7f
https://doi.org/10.1016/j.msea.2007.02.099
https://doi.org/10.1016/j.msea.2007.02.099
Publikováno v:
Scripta Materialia. 55:1019-1022
Instrumented anvil-on-rod impact testing is used to investigate the high-strain-rate mechanical behavior of Zr-based bulk metallic glass composite containing 70 vol.% tungsten. Transient deformation profiles and sample back surface velocity traces ar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::38494102cf24320cc1d2deeef73475e1
https://doi.org/10.1016/j.scriptamat.2006.08.009
https://doi.org/10.1016/j.scriptamat.2006.08.009
Publikováno v:
Materials and Manufacturing Processes. 21:591-596
Ceramic gun barrels have the potential to provide a significant increase in barrel life as well as reduction in weight for small caliber systems. The potential use of ceramic tubes as gun barrels may be severely limited due to the difficulty in intro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::27cb91575b43ffc1a9f37a806075c6a5
https://doi.org/10.1080/10426910600609395
https://doi.org/10.1080/10426910600609395
Autor:
L. S. Magness, Brian E. Schuster, Laszlo J. Kecskes, H. Zhang, Robert J. Dowding, Ruslan Z. Valiev, Kyu Cho, Qiuming Wei, K.T. Ramesh
Publikováno v:
Acta Materialia. 54:4079-4089
Fully dense nanocrystalline tungsten (nc-W) with extremely high strength (∼3.0 GPa under quasi-static compression and ∼4.0 GPa under dynamic compression) has been obtained by high-pressure torsion (HPT) at low temperature (500 °C). The nanocryst
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::987d513b790cad796ddcfebde8ffd8e1
https://doi.org/10.1016/j.actamat.2006.05.005
https://doi.org/10.1016/j.actamat.2006.05.005
Publikováno v:
Materials Science and Engineering: A. 429:115-123
Micromechanics models are developed for tungsten (W)-based bulk metallic glass (BMG) matrix composites employing the Voronoi tessellation technique and the finite element (FE) method. The simulation results indicate that the computed elastic moduli a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::469e8f643ede9e676d152fc76c6a3d49
https://doi.org/10.1016/j.msea.2006.05.027
https://doi.org/10.1016/j.msea.2006.05.027
Publikováno v:
Philosophical Magazine Letters. 86:333-345
The applicability of various hardness–yield strength (H − σy ) relationships currently available in the literature for bulk metallic glasses (BMGs) is investigated. Experimental data generated on ZrHf-based BMGs in this study and those available
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2bf8126baa85dc4a48403bfa198b686c
https://doi.org/10.1080/09500830600788935
https://doi.org/10.1080/09500830600788935
Publikováno v:
JOM. 58:67-71
Nanocrystalline tungsten has the potential to have superior strength and hardness properties versus conventional tungsten. While tungsten nanopowders are becoming more commonly available, processing through conventional press and sinter techniques in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a93d9f92c7e6a1b62f6810b207000469
https://doi.org/10.1007/s11837-006-0218-2
https://doi.org/10.1007/s11837-006-0218-2
Publikováno v:
Acta Materialia. 53:3849-3859
Shear band formation has been known to be the dominant deformation mechanism at room temperature in bulk metallic glasses. However, many indentation studies have revealed only a few shear bands surrounding the indent on the top surface of the specime
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::351cf6d69333bae9abef700e597daa5c
https://doi.org/10.1016/j.actamat.2005.04.036
https://doi.org/10.1016/j.actamat.2005.04.036