Fatigue crack propagation was modeled by using the cyclic plasticity material properties and fatigue constants for crack initiation. The cyclic elastic-plastic stress-strain field near the crack tip was analyzed using the finite element method with the implementation of a robust cyclic plasticity theory. An incremental multiaxial fatigue criterion was employed to determine the fatigue damage. A straightforward method was developed to determine the fatigue crack growth rate. Crack propagation behavior of a material was obtained without any additional assumptions or fitting. Benchmark Mode I fatigue crack growth experiments were conducted using 1070 steel at room temperature. The approach developed was able to quantitatively capture all the important fatigue crack propagation behaviors including the overload and the R-ratio effects on crack propagation and threshold. The models provide a new perspective for the R-ratio effects. The results support the notion that the fatigue crack initiation and propagation behaviors are governed by the same fatigue damage mechanisms. Crack growth can be treated as a process of continuous crack nucleation.
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e-mail: yjiang@unr.edu
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January 2004
Technical Papers
Modeling of Fatigue Crack Propagation
Yanyao Jiang,
e-mail: yjiang@unr.edu
Yanyao Jiang
University of Nevada, Mechanical Engineering Department (312), Reno, NV 89557
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Miaolin Feng
Miaolin Feng
University of Nevada, Mechanical Engineering Department (312), Reno, NV 89557
Search for other works by this author on:
Yanyao Jiang
University of Nevada, Mechanical Engineering Department (312), Reno, NV 89557
e-mail: yjiang@unr.edu
Miaolin Feng
University of Nevada, Mechanical Engineering Department (312), Reno, NV 89557
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division September 30, 2002; revision received June 20, 2003. Associate Editor: R. C. McClung.
J. Eng. Mater. Technol. Jan 2004, 126(1): 77-86 (10 pages)
Published Online: January 22, 2004
Article history
Received:
September 30, 2002
Revised:
June 20, 2003
Online:
January 22, 2004
Citation
Jiang, Y., and Feng, M. (January 22, 2004). "Modeling of Fatigue Crack Propagation ." ASME. J. Eng. Mater. Technol. January 2004; 126(1): 77–86. https://doi.org/10.1115/1.1631026
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