To predict the fatigue life of a notched member from a strain-life curve, the high strain concentration at the root of the notch must be known. For determining this high (post yield) strain, the Neuber’s Rule (for plane stress) and linear rule (for plane strain) can be applied. To investigate the accuracy of these method a notched member which is subjected to fully reversed cyclic loading is analyzed by the finite element method. Moreover, members with different thicknesses are analyzed with three dimensional elements, and a correlation between plane and three dimensional data is obtained. This correlation may be used as a first approximation for estimation of fatigue life of notched members with different thicknesses. Four-node, linear isoparametric elements and eight node brick elements are used in plane and three dimensional cases to obtain the elastic strain concentration at the notch. Then the “correct” strain on the cyclic stress-strain curve is obtained by the “initial strain method”. The life predicted from the strains obtained by the Neuber or linear method is compared with the life predicted from the strain obtained by the finite element method.
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Hagedoorn, A. Henry
Master of Science (M.S.)
College of Engineering
Length of Campus-only Access
Masters Thesis (Open Access)
Elmi, Shahram, "The Effect of Thickness on Neuber's Rule for Estimation of Fatigue Life" (1986). Retrospective Theses and Dissertations. 4941.
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