ISSN: 0090-3973
Page Count: 6

Evaluation of the Three-Component Model for Representing Wide-Range Fatigue Crack Growth Rate Data
Saxena, A
Senior engineers, Structural Behavior of Materials Department, Westinghouse R&D Center, Pa.

Hudak, SJ
Senior engineers, Structural Behavior of Materials Department, Westinghouse R&D Center, Pa.

Abstract

The three-component model for representing wide-range fatigue crack growth rate (FCGR) behavior is evaluated by using a standard data set containing data at several load ratios on a 2219-T851 aluminum alloy. It is shown that this model can be used to model FCGR data accurately. The predicted fatigue lives for two geometries were obtained by integrating the fitted FCGR curves. These results compared well with the observed lives. Also, it was shown that the model has the flexibility to represent complex effects of load ratio over a wide range of load ratio and crack growth rate. This ability to interpolate easily between load ratios and to provide accurate fatigue life predictions makes the model an asset to design and reliability analyses.

Keywords:
fatigue (materials), crack propagation, stresses, stress intensity, model, threshold, 2219-T851 aluminum, load ratio

Paper ID: JTE10607J
DOI: 10.1520/JTE10607J
ASTM International is a member of CrossRef.