Neutron and X-ray diffraction studies and cohesive interface model of fatigue crack deformation behavior

Journal Article · Mon Dec 31 23:00:00 EST 2007 · Philosophical Magazine Letters

DOI:https://doi.org/10.1080/09500830802311080· OSTI ID:936280

Barabash, Rozaliya ^[1]; Gao, Yanfei ^[1]; Sun, Yinan ^[2]; Lee, Sooyeol ^[1]; Choo, H. ^[2]; Liaw, Peter K ^[2]; Brown, Donald ^[3]; Ice, Gene E ^[1]

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1. ORNL
2. University of Tennessee, Knoxville (UTK)
3. Los Alamos National Laboratory (LANL)

The crack-tip deformation behavior during a fatigue test with a single overload is studied using (1) neutron diffraction technique, from which both elastic lattice strain and dislocation densities are obtained, and (2) the finite element method that is based on an irreversible and hysteretic cohesive interface model. Neutron strain measurements and finite element simulations show a good qualitative agreement. The large plastic zone induced by the overload and the resulting compressive residual strains, are observed in front of the crack tip after the overload, are the principal reasons for the fatigue crack growth retardation.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 936280
• Journal Information: Philosophical Magazine Letters, Journal Name: Philosophical Magazine Letters Journal Issue: 8 Vol. 88; ISSN PMLEEG; ISSN 0950-0839
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CRACK PROPAGATION
DEFORMATION
DISLOCATIONS
FINITE ELEMENT METHOD
NEUTRON DIFFRACTION
NEUTRONS
PLASTICS
STRAINS
X-RAY DIFFRACTION