Experimental and analytical research on erosion of 1100-0 aluminum, 316 stainless steel, commercially pure annealed nickel, and 6A1-4V titanium (annealed) is summarized. The erosion is caused by the multiple impacts of a water jet in a rotating disk facility. The relationship between the velocity of impact and the number of impacts at which visible indentations were observed is compared with the high-frequency fatigue strength of these materials. The experimentally observed rates of erosion are compared with a recently developed theory of erosion. The fatigue life distribution curves also are included. The peak rate of erosion varies approximately as the fifth power of the velocity, whereas the time at which the peak rate is observed varies as the one-fifth power. The cavitation erosion strength and liquid impact erosion strengths of these materials also are compared.
Nicholson Bailey model (NB-1930) [7]. In this paper the modified NB model is applied to host parasitoid system and the stability criteria were analysed and illustrated.
Polymer concrete is a relatively low-cost composite material system that has been developed to be a technically viable alternative to porcelain for most high voltage electrical insulation applications (both outdoor and indoor). Following the early development of the material at WestinghouseR&D under the sponsorship of the Electric Power Research Institute, numerous additional R&D projects/studies have been carried out both in the U.S. and abroad. The material is now utilized by many utilities and accepted by a wide range of electrical industries for a host of routine as well as innovative applications. This paper summarizes the performance of polymer concrete in various types of insulator applications in Brazil. The performance of the insulators, after approximately 6 years in the field, appears to be good and trouble-free, confirming, generally, the experience with well-designed, scientifically formulated and properly processed polymer concrete insulators in other parts of the world.
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