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Concentración de esfuerzos y fatiga

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Concentración de esfuerzos y fatiga
 

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Concentración de esfuerzos y fatigaOnline version

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by Juan Pérez
1

En el diseño de un eje sometido a fatiga por flexión rotativa , el factor de concentración de esfuerzos teórico ( ) se obtiene de las gráficas de Kt en función de la relación r / d . Sin embargo , el valor realmente gobierna el diseño es el factor de concentración de esfuerzos por fatiga ( ) , el cual se calcula aplicando el factor de sensibilidad a la muesca ( q ) mediante la ecuación de q . Cuando el material es muy dúctil y el radio de muesca es grande , q tiende a , por lo que Kf ? Kt . Este análisis es crítico porque un error en la estimación de Kf puede resultar en una falla por fatiga , aunque el factor de seguridad estático sea elevado . Por ello , la norma recomienda verificar siempre la vida a fatiga por encima de la resistencia estática .

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