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Predicting remaining life in upper sugar-mill shafts
Predicción de vida remanente en ejes de maza superior de molino de caña
DOI:
https://doi.org/10.15446/ing.investig.v26n1.14686Keywords:
fracture mechanics, shaft, journal, fracture toughness, crack (en)mecánica de fractura, eje, guijo, tenacidad de fractura, fisura (es)
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A fracture mechanics-based method is presented for determining critical crack size and residual life of upper sugar-mill shafts having semi-elliptical and circumferential cracks. Due to the multiaxial stress field, an equivalent strain energy release rate stress intensity solution is used in Paris' law to predict crack growth. Ultrasonic inspection intervals for the shaft were established. The crack zone evaluated was located in the shoulder of the bearing nearest to the square box coupling where about 25% of service failures in these types of shaft are observed.
En este artículo se presenta un método basado en la mecánica de fractura para el cálculo del tamaño crítico de fisuras y la vida remanente de un eje de maza superior de molino de caña de azar, con fisuras semielípticas y circunferenciales. Debido a la presencia de un campo de esfuerzos multiaxiales es necesario usar en la ley de París un factor de intensidad de esfuerzos equivalente. Se obtuvieron los intervalos entre inspección requeridos para evitar una falla por fatiga de estos elementos. Para el cálculo de vida residual y tamaño de fisura máxima se considera la zona localizada en el cambio de diámetro del guijo más próximo al acoplamiento cuadrado, donde se encontró el 25% de las fallas.
References
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Copyright (c) 2006 Sara Rodríguez Pulecio, John Jairo Coronado Marín, Nelson Arzola de la Peña
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