An experimental investigation on fatigue crack growth of AL6XN stainless steel

Journal Article · Thu May 01 00:00:00 EDT 2008 · Engineering Fracture Mechanics

DOI:https://doi.org/10.1016/j.engfracmech.2007.11.002· OSTI ID:1376635

Kalnaus, Sergiy ^[1]; Fan, F. ^[2]; Vasudevan, A. K. ^[3]; Jiang, Y. ^[2]

---

1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Nevada, Reno, NV (United States)
2. Univ. of Nevada, Reno, NV (United States)
3. Office of Naval Research, Arlington, VA (United States)

Here, the crack growth behavior of AL6XN stainless steel was experimentally investigated using round compact tension (CT) specimens. The influences of the R-ratio (the ratio of the minimum load over the maximum applied load in a cycle), the tensile and compressive overloads, and the loading sequence on crack growth were studied in detail. The results from the constant-amplitude experiments show a sensitivity of the crack growth rate to the R-ratio. The application of a tensile overload has a profound effect on crack growth, resulting in a significant retardation in the crack propagation rate. A compressive overload (underload) leads to a short-lived acceleration in crack growth. Results from the two-step high–low loading reveal a period of crack growth retardation at the beginning of the lower amplitude step, an effect similar to that of a single overload. A crack driving force parameter together with a modified Wheeler model is found to correlate the crack growth experiments well.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1376635
• Journal Information: Engineering Fracture Mechanics, Journal Name: Engineering Fracture Mechanics Journal Issue: 8 Vol. 75; ISSN 0013-7944
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING