A continuum based macroscopic unified low-and high cycle fatigue model
Frondelius, Tero; Holopainen, Sami; Kouhia, Reijo; Ottosen, Niels Saabye; Ristinmaa, Matti; Vaara, Joona (2019-12-02)
Frondelius, T., Holopainen, S., Kouhia, R., Ottosen, N., Ristinmaa, M., Vaara, J. (2019) A continuum based macroscopic unified low-and high cycle fatigue model. In ICMFF12 - 12th International Conference on Multiaxial Fatigue and Fracture, 300, 16008. https://doi.org/10.1051/matecconf/201930016008
© The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe2020112092210
Tiivistelmä
Abstract
In this work, an extension of a previously developed continuum based high-cycle fatigue model is enhanced to also capture the low-cycle fatigue regime, where significant plastic deformation of the bulk material takes place. Coupling of the LCFand HCF-models is due to the damage evolution equation. The high-cycle part of the model is based on the concepts of a moving endurance surface in the stress space with an associated evolving isotropic damage variable. Damage evolution in the low-cycle part is determined via plastic deformations and endurance function. For the plastic behaviour a non-linear isotropic and kinematic hardening J2-plasticity model is adopted. Within this unified approach, there is no need for heuristic cycle-counting approaches since the model is formulated by means of evolution equations, i.e. incremental relations, and not changes per cycle. Moreover, the model is inherently multiaxial and treats the uniaxial and multiaxial stress histories in the same manner. Calibration of the model parameters is discussed and results from some test cases are shown.
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