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A Short Crack Growth Model for the Prediction of Fatigue Lives under Multiaxial Nonproportional Loading

: Döring, R.; Hoffmeyer, J.; Seeger, T.; Vormwald, M.

Moreira de Freitas, M. ; European Structural Integrity Society -ESIS-:
Sixth International Conference on Biaxial/ Multiaxial Fatigue & Fracture 2001. Proceedings
Lisboa: Instituto Superior Tecnico, 2001
pp.571-578 (Vol.2)
International Conference on Biaxial/Multiaxial Fatigue & Fracture <6, 2001, Lisbon>
Conference Paper
Fraunhofer LBF ()
multiaxial nonproportional loading; crack growth; fatigue crack; fatigue life

Initiation and short fatigue crack growth have been investigated under nonproportional cyclic loading. A critical plane approach based on fracture mechanics is used for modelling the fatigue process. A Paris-type crack growth law, formulated using the effective cyclic J-integral as crack driving force parameter, is integrated to give crack growth curves. Crack opening stresses and strains are calculated with approximation equations. Jiang`s plasticity model is used to predict the stress-strain path. The good agreement beween model and real damage evolution is shown comparing experimentally determined crack growth curves, crack orientations, and life curves.