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This paper addresses the problem of the material fatigue propertiesestimation for assessing real mechanical components. These information are needed toapply the most modern methods capable of assessing components weakened by notchesand defects, subjected to both uniaxial and multiaxial fatigue loadings. In particular, byusing a large database of fatigue data, some practical rules are proposed to estimatethe plain material fatigue limit (under uniaxial and torsional loadings) and the ElHaddad’s short crack constant.