High cycle multiaxial fatigue crack initiation : experimental observations and microstructure simulations
TypeCommunications avec actes
This study provides an analysis of high cycle multiaxial fatigue crack initiation modes based on SEM observations.The statistical study of crack initiation preferential sites shows that grains with multiple slip have a high probability of crack initiation. The application of Dang Van criterion at the grain scale using finite element analysis (cubic elasticity with / or without crystal plasticity) on 3D synthetic semi-periodic microstructures shows a strong heterogeneity of both the hydrostatic stress and shear. The evolution of this heterogeneity introduced by the material behavior is discussed. Finally, a method based on the extreme values statistics is proposed and applied to the fatigue indicative parameter associated to the Dang Van criterion. The effects of free surface and constitutive material model were analyzed.
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In situ synchrotron ultrasonic fatigue testing device for 3D characterisation of internal crack initiation and growth MESSAGER, Alexandre; JUNET, Arnaud; PALIN-LUC, Thierry; BUFFIÉRE, Jean Yves; SAINTIER, Nicolas; RANC, Nicolas; EL MAY, Mohamed; GAILLARD, Yves; KING, Andrew; BONNIN, Anne; NADOT, Yves (2020)This work presents a new ultrasonic fatigue testing device for studying the initiation and propagation mechanisms of internal microstructurally short fatigue cracks using in situ synchrotron tomography. Its principle is ...
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About the effect of plastic dissipation in heat at the crack tip on the stress intensity factor under cyclic loading RANC, Nicolas; PALIN-LUC, Thierry; PARIS, Paul Croce; SAINTIER, Nicolas (Elsevier, 2013)Because of the reverse cyclic plastic zone at the crack tip, there is plastic dissipation in heat at the crack tip under cyclic loading. That creates a heterogeneous temperature field around the crack tip. A thermo-mechanical ...
Non-local energy based fatigue life calculation method under multiaxial variable amplitude loadings SAINTIER, Nicolas; PALIN-LUC, Thierry; BÉNABÈS, Jérôme; COCHETEUX, Francis (Elsevier, 2013)Reliable design of industrial components against high cycle multiaxial fatigue requires a model capable of predicting both stress gradient and load type effects. Indeed, taking into account gradient effects is of prior ...
ROBERT, Camille; HOR, Anis; MOREL, Franck; SAINTIER, Nicolas; PALIN-LUC, Thierry (2013)An analysis of high cycle fatigue behavior is done via the numerical simulation of polycrystalline aggregates. Different metallic materials with a FCC crystalline structure, but different cubic elastic coefficients, are ...