NDLI: Polycrystalline microstructure, cubic elasticity, and nucleation of high-cycle fatigue cracks

Content Provider	Springer Nature Link
Author	Sauzay, Maxime Jourdan, Thomas
Copyright Year	2006
Abstract	It is well-known that high-cycle fatigue cracks usually nucleate in surface well-oriented grains with a high Schmid factor. A numerical evaluation of the effect of crystalline elasticity anisotropy (which is often neglected) on the stress state in well-oriented grains is presented. Each of these grains is located at the free surface of an aggregate. The other crystallographic orientations are random. Numerous finite element computations are carried out for evaluating the effect of the neighboring grain orientations. Resolved shear stress and normal stress averages are given, as well as scatter parameters and histograms. Several metals, orientations, and loading conditions are considered. For common (anisotropic) metals/alloys such as copper and austenitic steels, the local average resolved shear stress is about 18% smaller than the macroscopic value which induces a Schmid factor value with respect to the macroscopic tensile stress of 0.41 instead of the classical 0.5 value. Relative scatters in resolved shear stress and corresponding normal stress are high (respectively ± 22% and ± 38%). These high scatter values computed for small applied loads can explain many observations taken from the literature showing a large scatter in the plastic slip line feature, dislocation microstructure, microstructurally short crack nucleation, and propagation rate among well-oriented surface grains. Finally, the effects of some geometrical parameters are evaluated (2D/3D effects, subsurface grains....).
Starting Page	431
Ending Page	446
Page Count	16
File Format	PDF
ISSN	03769429
Journal	International Journal of Fracture
Volume Number	141
Issue Number	3-4
e-ISSN	15732673
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-10-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polycrystal Scatter Neighbor grains Crystalline elasticity High-cycle fatigue Crack nucleation Mechanical Engineering Automotive and Aerospace Engineering, Traffic Civil Engineering Characterization and Evaluation Materials Mechanics
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Computational Mechanics Modeling and Simulation

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