A critical-plane criterion for multiaxial fatigue regimes characterised by low number of stress cycles isdiscussed. Such a criterion is formulated in terms of strains, by obtaining the displacement componentsacting on the critical plane from the strain tensor and, then, by considering an equivalent strain as aparameter to quantify the fatigue damage. Since the metallic materials generally behave in a plastic mannerin low-cycle regime, the effective Poisson ratio has to be taken into account when defining the straintensor. The theoretical results are here determined by varying the value of such a parameter in order toassess its influence on the fatigue life estimation. The effectiveness of the criterion is evaluated throughexperimental data related to fatigue tests on metallic hollow specimens under biaxial fatigue.

Fatigue life estimation for multiaxial low-cycle fatigue regime: The influence of the effective Poisson ratio value

RONCHEI, Camilla;
2015

Abstract

A critical-plane criterion for multiaxial fatigue regimes characterised by low number of stress cycles isdiscussed. Such a criterion is formulated in terms of strains, by obtaining the displacement componentsacting on the critical plane from the strain tensor and, then, by considering an equivalent strain as aparameter to quantify the fatigue damage. Since the metallic materials generally behave in a plastic mannerin low-cycle regime, the effective Poisson ratio has to be taken into account when defining the straintensor. The theoretical results are here determined by varying the value of such a parameter in order toassess its influence on the fatigue life estimation. The effectiveness of the criterion is evaluated throughexperimental data related to fatigue tests on metallic hollow specimens under biaxial fatigue.
Critical-plane criterionStrain-based criterionPoisson ratioFatigue life
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11770/304660
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