Volume 3 nr 1 / 2011 - Academia Oamenilor de Stiinta din Romania

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58 Mircea O. Popoviciu, Ilare Bordeasu, Liviu MarsavinaConclusions1. The Bulb turbines shaft work in condition of corrosive fatigue. The atmosphereloaded with fog and water vapors is due to minor deficiencies of the sealingdevices as well as to the water.2. The crack results from fatigue phenomenon induced by the variable loads.3. The evolution of crack propagation was obtained using the Fracture Mechanicsconcepts, in the linear elastic domain, in the case of bending plus tension witha pulsating cycle.4. Using the fatigue module ANSYS v.11, we obtained a minimum duration untilthe initiation of fissures in the connection zone of N i = 3.0136 10 8 cycles,equivalent with 80,370 service hours.5. The simulation for crack increase until d = 16 mm (depth) and 2 c = 64 mm(length) lead to a service duration of approximately 153.243 hours andapproximately 159737 hours until the piercing of the shaft wall, which impliesthe shaft replacement.6. The obtained results are of deep interest for establishing the inspection periodsfor the Bulb units in the Power Station Iron Gates II.R E F E R E N C E S[1] Forman R. G., Hearney V. E., Engle R. M., J. of Basic Eng., Trans. ASME, Vol. 89, 1967.[2] Bordeaşu, I., Popoviciu, M.O., Novac, D.M., Machine Design, Monograph University ofNovi Sad, 2009, pp. 191-196.[3] Raju I. S., Newman J. C., Proc. of 17 th National Symposium on Fracture Mechanics, Albany,NY, 1984.[4] Hartner J. A., AFGROW users guide and technical manual, Ohio, 2008.Copyright © Editura Academiei Oamenilor de Știință din România, 2011Watermark Protected
Annals of the Academy of Romanian ScientistsSeries on Engineering SciencesISSN 2066-8570 Volume 3, Number 1/2011 59GENERAL CONSIDERATIONS REGARDING THE IMPACTOF THE VIDRARU LAKE HYDRO FACILITIESON THE ENVIRONMENTRemus PRAVALIE 1Rezumat. În articol, după prezentarea parametrilor morfometrici, a condiţiilor fizicogeograficeiniţiale ale bazinului hidrografic în care este situat lacul de acumulare Vidrarude pe Argeş, se analizează succint impactul acestuia asupra mediului riveran şi regional.Abstract. After presenting the morphometric parameters and the initial physicalgeographicalconditions of the drainage basin where the Vidraru Reservoir is located, onthe bank of the Argeş River, this article briefly analyses the impact of the basin on theriverine and regional environment.Keywords: Vidraru Reservoir, impact, environment, analysis1. General ConsiderationsThe first studies on the region where the Vidraru Reservoir is located, i.e. FăgăraşMountains, were conducted by the French geographer, Emmanuel de Martonne, inthe 19 th century, when he made his first remarks on the Southern Carpathians (or theTransylvanian Alps, as he called them) and, consequently, on the Făgăraş Mountains.Later on, after 1950, remarkable studies on the Făgăraş Mountains have beenpublished by Gh. Niculescu (in 1959 and 1961), E. Nedelcu (in 1959, 1962, and1966), M. Florea (in 1998), etc. Studies on glacial lakes, reservoirs and the VidraruReservoir have been conducted by P. Gâştescu (in 1971, 1996 and 2003), I. Pişota(in 1972), I. Ujvari (in 1972), and Al. Nedelea (in 2006).The Vidraru Reservoir is located in the Southern Carpathians, in FăgăraşMountains. A major surface of the Reservoir is located in the Loviştea Basin, in agraben, in the east side. The lake dam has the following geographical coordinates:45 o 22' N and 24 o 37' E (fig. 1.).The lake covers an area of 870 ha, and has a total water volume of about473 million m³, and a normal level of retention volume of 469 million m³ [12],and the dam has a height of 166 meters.The dam construction began in 1960 and was completed in 1966. At that time (in1967), the Vidraru Dam was, by height, the fifth arch dam in Europe and the ninth inthe world [9]. The dam is a double-arched concrete construction with a length of 307meters, and a base width of 25 meters and a crown width of 6 meters.1 Student, III, Faculty of Geography, University of Bucharest, Romania, pravalie_remus@yahoo.com.Copyright © Editura Academiei Oamenilor de Știință din România, 2011Watermark Protected
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3FOREWORDBased on a rich scientific
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Volume 3 nr 1 / 2011 - Academia Oamenilor de Stiinta din Romania

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