Tampere University of Technology /
Reijo Kouhia / Research
Fatigue analysis
High-cycle fatigue
Most fatigue analysis methods encounters problems when the loading produces multiaxial non-proportional irregular stress histories. Ottosen, Stenström and Ristinmaa proposed in 2008 (Int. J. Fatigue, 30, 996-1006, DOI) an evolution equation based approach for high-cycle fatigue which
- does not need determination of an equivalent representative cycle, i.e. cycle-counting methods, and
- for finite life predictions does not need cumulative damage approaches.
Such an approach is thus ideal for anaysing complex multiaxial loading histories and can be consistently generalized to anisotropic solids and to unify the two distinct types of fatigue analysing methods needed in low-cycle and high-cycle regimes.
Unified fatigue approach
Creep fatigue
Collaborators
My close collaborators at TUT are Sami Holopainen and
Timo Saksala.
Niels Saabye Ottosen,
Department of Construction Sciences, Lund University, Lund, Sweden
Matti Ristinmaa,
Department of Construction Sciences, Lund University, Lund, Sweden
Some publications
- S. Holopainen, T. Barriere, G. Cheng, R. Kouhia.
Continuum approach for modeling fatigue in amorphous glassy polymers. Applications to the investigation of damage-ratcheting interaction in polycarbonate. In Press International Journal of Plasticity, DOI
- R. Kouhia, S. Holopainen, N.S. Ottosen, M. Ristinmaa, T. Saksala.
A unified LCF-HCF model based on continuum mechanics.
Presented at the NSCM29, 26-28 October, 2016, Gothenburg, Sweden.
Paper,
SLIDES.
- S. Holopainen, R. Kouhia, T. Saksala.
Continuum approach for modelling transversely isotropic high-cycle fatigue. European Journal of Mechanics - A/Solids, 60, 2016, 183-195. DOI
- S. Holopainen, R. Kouhia, N.S. Ottosen, M. Ristinmaa, T. Saksala.
Modelling of anisotropic fatigue
Presented at the 24th International Congress of Theoretical and Applied Mechanics, 21-26 August, 2016, Montreal, Canada.
Abstract,
SLIDES,
- P. Kauppila, R. Kouhia, J. Ojanperä, T. Saksala and T. Sorjonen.
A continuum damage model for creep fracture and fatigue analyses.
Structural Integrity Procedia, 2, 2016, 887-894,
Open access DOI
Presented at European Conference on Fracture, ECF21, 20-24 June, 2016,
SLIDES, my presentation at
YouTube,
- S. Holopainen, R. Kouhia, J. Könnö and T. Saksala.
Computational modelling of transversely isotropic high-cycle fatigue using a continuum based model.
Structural Integrity Procedia, 2, 2016, 2718-2725.
Open access DOI
Presented at European Conference on Fracture, ECF21, 20-24 June, 2016,
Timo's presentation at
YouTube,
- S. Holopainen, R. Kouhia, J. Könnö and T. Saksala.
Computational modelling of high-cycle fatigue using a continuum based model
.
Proceedings of the 28th Nordic Seminar on Computational Mechanics, NSCM-28, A. Berezovski, K. Tamm, T. Peets (eds.),
Tallinn, 22-23 October, 2015, pp. 71-74.
Some links
Last update 11.3.2017