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Showing papers by "Ghulam Ishaq Khan Institute of Engineering Sciences and Technology published in 2004"


Journal ArticleDOI
TL;DR: In this article, the deformation behavior of high manganese austenitic Hadfield steel sheet samples was studied under uniaxial tensile test conditions and the effect of temperature on the tensile behaviour and fracture appearance was also studied using the scanning and transmission electron microscopes.

134 citations


Journal ArticleDOI
TL;DR: In this paper, the authors investigated the thermal stability of different diamond grades under environmental conditions which are characteristic for the selected pressurized liquid melt infiltration technique (squeeze casting) and the influence of both the diamond grade, i.e., synthetic and natural, mono-and polycrystalline diamond and the particle size.

70 citations


Journal ArticleDOI
TL;DR: In this paper, the interfacial structure, phases and carbides have been examined in a brazing filler metal with embedded diamond grits, and the morphology of the epitaxial layers and nano-sized carbides grown at the interface between diamond and alloy matrix has been studied to illustrate the reaction mechanism which is essential for achieving better properties.

53 citations


Journal ArticleDOI
TL;DR: In this paper, an experimental model of a sand-filled, high-voltage, high breaking capacity fuse was used to measure the time-resolved arc temperature at different times during the arcing period.
Abstract: We present estimates of the temperature at different times during the arcing period of an experimental model of a sand-filled, high-voltage, high breaking capacity fuse. The model fuse does not interrupt current automatically but the technique described here could well be used in actual current-limiting high-voltage fuses to measure the time-resolved arc temperature. The test fuse is energized using a synthetic test circuit, which supplies the fuse a prospective current of 4.5 kA at 6 kV, 50 Hz. An optical fibre is used to carry light from the fuse arc to a spectrograph which is used to isolate spectral lines of interest. The spectrum is recorded by an intensified photodiode array. By gating the image intensifier in front of the diode array a complete spectrum is recorded in several microseconds. By varying the timing of the gate pulse the arc spectrum can be obtained at any desired time during the arcing period. The arc temperature is determined from the relative intensities of Si II spectral lines. The arc temperature is found to vary between 7,000 and 27,000 K at different instants during the arcing period.

5 citations


Posted Content
TL;DR: In this article, an approach is developed to solve the three body problem involving masses which posses spherical symmetry, and the method of solution would include the use of a single mass to replicate the effect of two individual masses on each body.
Abstract: In this paper, an approach is developed to solve the three body problem involving masses which posses spherical symmetry. The problem dates back to the times of Poincare, and is undoubtedly one of the oldest of unsolved problems of classical mechanics. The Poincares Dictum comprehensively proves that the problem is truly insolvable as a result of the nature of the instabilities involved. We therefore refute the idea of finding exact solutions. Instead, we develop closed form analytical approximations in place of exact solutions. We will solve the problem for the case when all the masses involved have spherically symmetric mass distributions. The method of solution would include the use of a single mass to replicate the effect of two individual masses on each body. The derivation of solutions will involve the use of the Lamberts wave function and the solution will comprise of the position vectors expressed as explicit time functions.

1 citations