Showing papers by "Defence Research and Development Laboratory published in 1993"
TL;DR: In this paper, the multidirectional preform and carbon-carbon process technology and research and development activities within the country are discussed and the test results on material characterisation, thermal, mechanical and tribological properties are presented.
Abstract: Carbon carbon composites are a new class of engineering materials that are ceramic in nature but exhibit brittle to pseudoplastic behaviour. Carbon-carbon is a unique all-carbon composite with carbon fibre embeded in carbon matrix and is known as an inverse composite. Due to their excellent thermo-structural properties, carbon-carbon composites are used in specialised application like re-entry nose-tips, leading edges, rocket nozzles, and aircraft brake discs apart from several industrial and biomedical applications. The multidirectional carbon-carbon product technology is versatile and offers design flexibility. This paper describes the multidirectional preform and carbon-carbon process technology and research and development activities within the country. Carbon-carbon product experience at DRDL has also been discussed. Development of carbon-carbon brake discs process technology using the liquid impregnation process is described. Further the test results on material characterisation, thermal, mechanical and tribological properties are presented.
74 citations
TL;DR: Experimental investigations have been carried out on electro-discharge machining of titanium in respect of surface finish, out-of-roundness and overcut using rotating copper-tungsten tool electrode as mentioned in this paper.
Abstract: Experimental investigations have been carried out on electro-discharge machining of titanium in respect of surface finish, out-of-roundness and overcut using rotating copper-tungsten tool electrode. An attempt has also been made to compare the results with stationary electrode.
21 citations
13 citations
01 Jan 1993
11 citations
TL;DR: In this article, the authors used thermography to evaluate delaminations, voids, missing layers and cloth joints in axisymmetric composite structures made by filament winding and hand lay-up techniques.
Abstract: Thermography has been developed to evaluate delaminations, voids, missing layers and cloth joints in axisymmetric composite structures made by filament winding and hand lay-up techniques. The composite structures were made of carbon/epoxy, carbon/phenolic, carbon/polyimide and high silica glass/phenolic. Thermography has been found to be simple, fast, very effective and reliable to locate these defects.
6 citations
TL;DR: The salient features of computer technology used by the US for this truly hi-tech war are discussed and the important lessons learnt by the use of high technology, primarily based on computers for future wars, have been presented for their applicability in the Indian context.
Abstract: Computer technology has revolutionised weapons system and hardware during the last decade 'miracle chip' has had impact in all areas of battlefield. The recent Gulf War has amply demonstrated the important role of computer technology in warfare. The best of the high technology was used during the 45 days of air battle followed by 100 hours of ground offensive. Computer and communication formed the heart of every weapon system from Tomahawk, SLAM, Scud, Patriot missile to night vision of tanks and Stealth fighters. This paper discuss the salient features of computer technology used by the US for this truly hi-tech war. the hi-tech weapon systems using computers for achieving surgical precision have been highlighted. The Indian scenario and the important lessons learnt by the use of high technology, primarily based on computers for future wars, have been presented for their applicability in the Indian context.
1 citations