Publication: Factor de intensidad de tensiones en fisuras elípticas con mecanismo de apertura y cierre en ejes giratorios
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2014-02
Defense date
2014-04-10
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Abstract
En esta Tesis Doctoral se ha desarrollado un modelo analítico que permite
obtener el Factor de Intensidad de Tensiones (FIT) a lo largo del frente de una
fisura recta o elíptica contenida en un eje giratorio, en función de las características
de la fisura, profundidad y forma, de la posición relativa en el frente y del
ángulo de giro del eje.
Para ello, se ha realizado un estudio numérico cuasiestático, mediante el Método
de los Elementos Finitos (MEF), a partir del cuál se han determinado, por
un lado, el FIT a lo largo del frente de la fisura sometida a flexión rotatoria,
teniendo en cuenta el fenómeno de apertura y cierre; y, por otro lado, el porcentaje
de apertura de la fisura durante un giro del eje. El modelo numérico ha sido
validado comparando sus resultados con otros recogidos en la literatura.
Por último, se ha analizado la propagación de la fisura contenida en el eje giratorio
mediante el desarrollo de un algoritmo que integra la Ley de Paris haciendo
uso del modelo desarrollado para el cálculo del FIT. ---------------------------------------------
In this PhD Thesis a general expression that gives the Stress Intensity Factor (SIF) along the crack front of an elliptical crack in a rotating shaft in terms of the crack depth ratio, crack aspect ratio, place ratio and the angle of rotation has been developed. A numerical study using the Finite Element Method (FEM) has been made. To simulate the rotation of the shaft, different angular positions have been considered. The SIF along the crack front of the shaft subjected to rotary bending has been calculated for each angular position of the cracked shaft and for different crack geometries. The numerical model has been used to investigate the partially opening/closing of the crack during the rotation of the shaft. The numerical results have been compared with others obtained from the literature. It has been found that they are in good agreement. Finally, the crack propagation has been analyzed using a developed algorithm of the Paris Law and the SIF expression proposed.
In this PhD Thesis a general expression that gives the Stress Intensity Factor (SIF) along the crack front of an elliptical crack in a rotating shaft in terms of the crack depth ratio, crack aspect ratio, place ratio and the angle of rotation has been developed. A numerical study using the Finite Element Method (FEM) has been made. To simulate the rotation of the shaft, different angular positions have been considered. The SIF along the crack front of the shaft subjected to rotary bending has been calculated for each angular position of the cracked shaft and for different crack geometries. The numerical model has been used to investigate the partially opening/closing of the crack during the rotation of the shaft. The numerical results have been compared with others obtained from the literature. It has been found that they are in good agreement. Finally, the crack propagation has been analyzed using a developed algorithm of the Paris Law and the SIF expression proposed.
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Keywords
Factor de Intensidad de Tensiones, FIT, Fisuras de frente elíptico, Ejes giratorios, Método de elementos finitos