Abstract
The results of experimental verification of Zenner and Lius criterion confirm its efficiency in the case of estimation of fatigue life for proportional loading. Due to application of general damage parameter, the criterion is useful in case of various types of proportional loading and for multiple materials. However, for non-proportional loadings, of high non-proportionality level, the error of estimation of fatigue lives often exceeds scatter band 3. The hereby work presents a proposal for Zenner and Lius criterion modification based upon introduction of loading non-proportionality measure with minimum circumscribed ellipse method (MCE).
Highlights
The idea of integral approach involves determination of mean values of the fatigue damage parameters within the material elementary volume
Double integration of these variables yields a square mean of the considered quantity. Thanks to such an approach it is possible to account for all the planes passing through a given point of the material. This kind of approach refers to interpretation of the second invariant of stress state deviator, proposed by Novoshilov [1], as a square mean of shear stresses located on each of the planes passing through the material considered point
Such an approach does not account for the fact that during a cycle of non-proportional load, apart from the module, the vector of shear stress changes its direction, drawing a hodograph
Summary
The idea of integral approach involves determination of mean values of the fatigue damage parameters within the material elementary volume. ZENNER AND LIU CRITERION IN CASE OF NON-PROPORTIONAL LOADS This kind of approach remains inconsistent with the results of experimental tests which confirm an impact of the phase shift and mean stress on the material fatigue behavior.
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