Changes in Lattice Strain Profiles around a Fatigue Crack through the Retardation Period after an Overloading (2005-069)

Journal Article · Tue Oct 31 23:00:00 EST 2006 · Journal of Physics B: Atomic, Molecular and Optical Physics

OSTI ID:931431

Hubbard, Camden R. ^[1]; Sun, Yinan ^[1]; Tang, Fei ^[1]; Lu, Yuchen ^[1]; Choo, Hahn ^[1]; Liaw, Peter K. ^[2]

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1. ORNL
2. University of Tennessee, Knoxville (UTK)

An overload was applied during a fatigue-crack-growth experiment, resulting in a temporary decrease in crack-growth rates, i.e., a retardation period. Neutron diffraction was used to investigate the retardation phenomenon by mapping the changes in the lattice-strain profiles around the fatigue-crack tip in a series of compact-tension (CT) specimens, which were fatigued to various stages through the retardation period after the overload. Following the overload, compressive-strain fields were observed along the loading direction close to the crack tip. As the crack grows out of the retardation period, the residual compressive strains decreased.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 931431
• Journal Information: Journal of Physics B: Atomic, Molecular and Optical Physics, Journal Name: Journal of Physics B: Atomic, Molecular and Optical Physics Journal Issue: Sp SI Vol. 385
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRACK PROPAGATION
FATIGUE
LATTICE PARAMETERS
NEUTRON DIFFRACTION
STRAINS