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A new low-cycle multiaxial fatigue criterion based on the concept of effective strain is proposed. The effective shear strain gamma-(eff) is derived by averaging shear strains acting on all planes at a material point during a loading cycle. The criterion, in the form of a generalized Smith-Watson-Topper expression, can take the effect of non-symmetrical loading cycles into account. The advantage of the proposed criterion relies on the minimum number of material parameters to be identified. The uniaxial stress-strain curve, the basic strain-life curve (Manson-Coffin) and an additional experimental curve obtained from zero to tension strain controlled axial fatigue tests are sufficient to apply the proposed criterion in all loading conditions. Different sets of proportional and non-proportional multiaxial strain controlled low cycle fatigue test results have been compared with the predicted life, showing in all cases a good agreement with the criterion.

Additional information

Authors: FILIPPINI M ET AL, Politecnico di Milano, Dipartimento di Meccanica, Milano (IT);PAPADOPOULOS I V, JRC Ispra (IT);SONSINO C M, Fraunhofer-Institut fur Betriebsfestigkeit, LBF, Darmstad (DE)
Bibliographic Reference: An oral report given at: The 6th International Conference on Biaxial/Multiaxial Fatigue and Fracture. Held in: Lisbon (PT), 25-28 June 2001
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