Octavian OANCĂ


19-62 CONSIDERAŢII PRIVIND AVARIILE PRODUSE LA ARBORII TURBINELOR BULB DE LA PORŢILE DE FIER II

CONSIDERETIONS CONCERNING THE DAMAGES
CREATED ON BULB TURBINES IRON GATES II
The paper presents the damages observed, after an important time of
running, on the shafts of hydraulic bulb turbines. The damages have taken the
form of multiple cracks, generated through fatigue stresses.
Keywords: application to fatigue, hydraulic tubine bulb, cracking, corrosion
Cuvinte cheie: solicitare de oboseală, tubine hidraulice bulb, fisuri,
coroziune

62 CONSIDERAŢII PRIVIND AVARIILE PRODUSE LA


20-58 STUDIUL REZISTENŢEI LA CAVITAŢIE A OŢELULUI INOXIDABIL MARTENSITIC CU 12 % CROM DESTINAT FABRICĂRII PALETELOR DE MAŞINI HIDRAULICE

STUDY OF RESISTANCE TO CAVITATION TO MARTENSITIC
STAINLESS STEEL WITH 12 % CHROM USED IN
MANUFACTURING HYDRAULIC MACHINERY BLADES
Paper analyses the cavitations erosion for stainless steel with 12 %
chromium and 6 % nickel content. The experimental researches were
undertaken in the Cavitations Laboratory of the Timişoara Polytechnic
University using a vibratory facility respecting the conditions of the ASTM G32-
2006 Standard.
The steel behaviour was evaluated both on the ground of
microstructure erosion (through optic and electronic microscopy) and by
comparisons with other reference steel, with 18 % chrome and 10 % nickel,
which was use in Romania and other countries for manufacturing turbine
blades.
Keywords: cavitation erosion, microstructure, maximum depth of
erosion, stainless steel, chemicals
Cuvinte cheie: eroziunea cavitaţiei, microstructură, adâncimea
maximă a eroziunii, oțel inoxidabil, elemente chimice

58 STUDIUL REZISTENŢEI LA CAVITAŢIE A OŢELULUI


20-83 CERCETAREA EROZIUNII PRIN CAVITAŢIE ÎN LABORATORUL DE MAŞINI HIDRAULICE DIN TIMIŞOARA

LA RECHERCHE SUR L’ÉROSION DE CAVITATION
DANS LE LABORATOIRE DE MACHINES
HYDRAULIQUES DE TIMISOARA
Le but de l’ouvrage est la promouvoir des capacités de recherche de
la résistance et le comportement pour les différents types de matériaux, utilisés
principalement dans la fabrication d’équipements hydrauliques, à l’érosion de
cavitation. En ce sens, sont présentées les appareils utilisées pour l’étude, les
photomicrographies significatives pour les dommages produites par cavitation,
des paramètres et les courbes spécifiques qui sont utilisées pour analyser le
matériel testé, du point de vue de son comportement pendant de la cavitation.
Keywords: cavitation erosion, vibration machine, material testing,
erosion parameter, characteristic curves
Cuvinte cheie: eroziunea prin cavitaţie, aparat vibrator, material testat,
parametru eroziune, curbe caracteristice

83 CERCETAREA EROZIUNII PRIN CAVITAŢIE ÎN


22-16 CONSIDERAȚII PRIVIND CRITERIILE DE EVALUARE A REZISTENȚEI MATERIALELOR LA EROZIUNEA PRIN CAVITAȚIE

This paper presents the using criterions to estimate the behavior and
cavitațional resistance of materials. The materials were testing in laboratory
installations. Also are analyses how can it apply and calculate.
Cuvinte cheie: cavitație, rezistență, criteriu, parametru, viteza de
eroziune cavitațională
Keywords: cavitations, resistance criteria, parameters, cavitational
erosion rate

16 CONSIDERAȚII PRIVIND CRITERIILE DE EVALUARE


22-7 CONTRIBUŢII ÎN CORELAREA PARAMETRULUI EROZIUNII CAVITAŢIONALE 1/MDPR CU PARAMETRII FUNCŢIONALI AI APARATULUI DE CERCETARE

Établir des relations pour permettre l`application des résultats des
testes d`érosion de la cavitation, d`un appareil a l`autre, représente une
continue préoccupation des chercheurs. À cet égard, l`ouvrage offre un model
de cet type de relation, mais qui, dans cette phase, permettre la corrélation
d`un petit nombre de matériaux, testé en Laboratoire de Machines
Hydrauliques de Timisoara, Gdansk et Michigan.
Cuvinte cheie: rezistența la cavitație, parametri aparat vibrator, relații
de corelare
Mots-clés: résistance à la cavitation, les paramètres des appareils
vibrants, des relations de corrélation

7 CONTRIBUŢII ÎN CORELAREA PARAMETRULUI