Strain Profiling of Fatigue Crack Overload Effects Using Energy Dispersive X-Ray Diffraction

Journal Article · Sat Jan 01 04:00:00 EST 2005 · Int. J. Fatigue

DOI:https://doi.org/10.1016/j.ijfatigue.2005.06.022· OSTI ID:913939

Croft, M; Zhong, Z; Jisrawi, N; Zakharchenko, I; Holtz, R; Gulak, Y; Skaritka, J; Fast, T; Sadananda, K; Tsakalakos, T

In this paper, an assessment of commonly used assumptions associated with {Delta}K{sub eff} and their implications on FCG predictions in light of existing experimental and numerical data is presented. In particular, the following assumptions are examined: (1). {Delta}K{sub eff} fully describes cyclic stresses and strains at the crack-tip vicinity. (2). K{sub op} can be determined experimentally or numerically with certain accuracy. (3). Overload alters K{sub op} but not K{sub max} and associated s{sub max} at the crack-tip 'process zone'. (4). Contact of crack faces curtails the crack driving force in terms of {Delta}K{sub eff}. The analysis indicates that there is insufficient support to justify the above assumptions. In contrary, the analysis demonstrates that a two-parameter fatigue crack driving force in terms of {Delta}K and K{sub max}, which accounts for both applied and the internal stresses should be used in FCG analyses and predictions.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 913939
• Report Number(s): BNL--78507-2007-JA
• Journal Information: Int. J. Fatigue, Journal Name: Int. J. Fatigue Vol. 27; ISSN 0142-1123; ISSN IJFADB
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCURACY
CRACKS
FATIGUE
NSLS
NUMERICAL DATA
STRAINS
STRESSES
X-RAY DIFFRACTION
national synchrotron light source