Influencia de la viscosidad en el desgaste por fatiga en contactos de rodadura de lubricantes sintéticos poliglicoles // Influence of the viscosity in the fatigue wear in rolling contacts of synthetic poliglycols lubricants
Abstract
En este trabajo se evalúa la vida a fatiga en contactos de rodadura de bolas de acero AISI 52100 de tres aceites
sintéticos poliglicoles (P.A.G.-9, P.A.G.-12 y BREOX-B-135X) con viscosidades de 9, 12 y 21 cSt a 100ºC,
respectivamente. La evaluación del mecanismo de fallo se realiza mediante ensayos de rodadura en la máquina de
cuatro bolas Seta-Shell modificada para ensayos de Extrema Presión. Una vez realizados los ensayos (de acuerdo con la
norma IP-300/82/87), con los aceites descritos, se determinan las gráficas de vida a fatiga utilizando la ley
probabilística de Weibull para mínimos, calculando los valores de L10 (probabilidad de fallo del 10 %), L50
(probabilidad de fallo del 50 %), Lm (vida media a fatiga) y a (pendiente de Weibull). Se realizan también las gráficas
S-T (tensión- tiempo) o curvas de probabilidad a fallo constante para L10 y L50. El trabajo evidencia la mejora
significativa de la vida a fatiga al aumentar la viscosidad de los aceites utilizados. Este efecto también se produce a altas
cargas.
Palabras claves: fatiga, rodadura, máquina de cuatro bolas, aceites sintéticos, poliglicoles, viscosidad,
lubricación elastohidrodinámica (EHL).
____________________________________________________________________
Abstract:
In this work is evaluated the fatigue life in rolling contacts of steel balls AISI 52100 of three synthetic polyglicols oils (P.A.G. -9,
P.A.G. -12 and BREOX-B-135X) with viscosities of 9, 12 and 21 cSt at 100ºC, respectively. The evaluation of the failure
mechanism is carried out by means of rolling rehearsals in the four balls Seta-Shell modified machine for rehearsals of extreme
pressure. Once the rehearsals are carried out (in accordance with the norm IP-300/82/87), with the described oils, the graphs of
fatigue life are determined by means of the Weibull probabilistic law for minimum, calculating the values of L10 (probability of
failure of 10%), L50 (probability of failure of 50%), Lm (half life to fatigue) and a (Weibull slope ). they are also carried out the
graphic S-T (tension - time) or constant failure probability curve for L10 and L50. The work evidences the significant
improvement of the fatigue life when increasing the viscosity of the used oils. This effect also takes place at high loads.
Key words: fatigue, rolling, four balls machine , synthetic oils, polyglicols, viscosity, elastohidrodinamic
lubrication (EHL).
Downloads
How to Cite
Issue
Section
License
Authors who publish with this journal agree to the following terms:a. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
b. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
c. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).