Closure to “Experimental Study on Contact Erosion Failure in Pavement Embankment with Dispersive Clay” by S. Premkumar, J. Piratheepan, A. Arulrajah, M. Disfani, and P. Rajeev

As supply DC voltage levels in automobiles, aviation and aerospace are becoming higher, high voltage and large capacity compact DC electromagnetic relays or contactors are becoming more important. In this paper, experiments were conducted at DC 270V/100 A in air and nitrogen, respectively, with CuCr40, CuCr45, CuCr50, CuW60, CuW70 and CuW90 as contact materials. Welding resistance (corresponding to electrical contact life), contact erosion and breaking arc durations were measured, and the obtained results were discussed.

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Discussion of “Experimental Study on Contact Erosion Failure in Pavement Embankment with Dispersive Clay” by S. Premkumar, J. Piratheepan, A. Arulrajah, M. Disfani, and P. Rajeev

Journal of Materials in Civil Engineering ◽

10.1061/(asce)mt.1943-5533.0001741 ◽

2017 ◽

Vol 29 (5) ◽

pp. 07016003

Author(s):

Amir Hossein Vakili ◽

Mohamad Razip Bin Selamat ◽

Parsa Mohajeri

Keyword(s):

Experimental Study ◽

Contact Erosion

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Experimental Study of Contact Erosion at a Granular Interface

Advances in Bifurcation and Degradation in Geomaterials - Springer Series in Geomechanics and Geoengineering ◽

10.1007/978-94-007-1421-2_17 ◽

2011 ◽

pp. 131-136

Author(s):

R. Beguin ◽

P. Philippe ◽

Y.-H. Faure

Keyword(s):

Experimental Study ◽

Contact Erosion

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Experimental Study on Arcing Process and Contact Erosion under Transverse Magnetic Field

10.1109/holm.2009.5284393 ◽

2009 ◽

Cited By ~ 4

Author(s):

Guofu Zhai ◽

Xue Zhou ◽

Xiaodong Zhao ◽

Chengyan Liu ◽

Fubiao Luo

Keyword(s):

Magnetic Field ◽

Experimental Study ◽

Transverse Magnetic Field ◽

Transverse Magnetic ◽

Contact Erosion

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Experimental Study on Contact Erosion Failure in Pavement Embankment with Dispersive Clay

Journal of Materials in Civil Engineering ◽

10.1061/(asce)mt.1943-5533.0001452 ◽

2016 ◽

Vol 28 (4) ◽

pp. 04015179 ◽

Cited By ~ 8

Author(s):

S. Premkumar ◽

J. Piratheepan ◽

A. Arulrajah ◽

M. M. Disfani ◽

P. Rajeev

Keyword(s):

Experimental Study ◽

Contact Erosion

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Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010013955x ◽

1995 ◽

Vol 53 ◽

pp. 636-637

Author(s):

Norio Baba ◽

Norihiko Ichise ◽

Syunya Watanabe

Keyword(s):

Experimental Study ◽

Spherical Aberration ◽

Incident Beam ◽

Optical Parameters ◽

Beam Tilting ◽

Illumination Method ◽

Restoration Method ◽

Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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