Understanding and quantifying the effects of overloads/overstrains on the cyclic damage accumulation at a microscale discontinuity is essential for the development of a multistage fatigue model under variable amplitude loading. Micromechanical simulations are conducted on a 7075-T651 Al alloy to quantify the cyclic microplasticity in the matrix adjacent to intact or cracked, life-limiting intermetallic particles. An initial overstrain followed by constant amplitude cyclic straining is simulated considering minimum to maximum strain ratios of 0 and . The nonlocal equivalent plastic strain at the cracked intermetallic particles reveals overload effects manifested in two forms: (1) the cyclic plastic shear strain range is greater in the cycles following an initial tensile overstrain than without the overstrain and (2) the initial overstrain causes the nonlocal cumulative equivalent plastic strain to double in subsequent tensile-going half cycles and triple in subsequent compressive-going half cycles, as compared with cases without an initial tensile overstrain. The cyclic plastic zone at the microdiscontinuity corresponds to that of the maximum strain during the initial overstrain and the nonlocal cyclic plastic shear strain range in the matrix near the intact or cracked inclusion is substantially increased for the same remote strain amplitude relative to the case without initial overstrain. These results differ completely from the effects of initial tensile overload on the response at a macroscopic notch root or at the tip of a long fatigue crack in which the driving forces for crack formation or growth, respectively, are reduced. The micromechanical simulation results support the incorporation of enhanced cyclic microplasticity and driving force to form fatigue cracks at cracked inclusions following an initial tensile overstrain in a fatigue incubation model.
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e-mail: anna.xue@usu.edu
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April 2010
Research Papers
Micromechanics Study of Fatigue Damage Incubation Following an Initial Overstrain
Yibin Xue,
Yibin Xue
Assistant Professor
Mechanical and Aerospace Engineering,
e-mail: anna.xue@usu.edu
Utah State University
, Logan, UT 84322
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Amanda M. Wright,
Amanda M. Wright
Engineer
Lockheed Martin Corporation
, Houston, TX 77058
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David L. McDowell,
David L. McDowell
Regents’ Professor
GWW School of Mechanical Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0405
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Mark F. Horstemeyer,
Mark F. Horstemeyer
Chair Professor
Center for Advanced Vehicular Systems,
Mississippi State University
, Mississippi State, MS 39762
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Kiran Solanki,
Kiran Solanki
Assistant Research Professor
Center for Advanced Vehicular Systems,
Mississippi State University
, Mississippi State, MS 39762
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Youssef Hammi
Youssef Hammi
Assistant Research Professor
Center for Advanced Vehicular Systems,
Mississippi State University
, Mississippi State, MS 39762
Search for other works by this author on:
Yibin Xue
Assistant Professor
Mechanical and Aerospace Engineering,
Utah State University
, Logan, UT 84322e-mail: anna.xue@usu.edu
Amanda M. Wright
Engineer
Lockheed Martin Corporation
, Houston, TX 77058
David L. McDowell
Regents’ Professor
GWW School of Mechanical Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0405
Mark F. Horstemeyer
Chair Professor
Center for Advanced Vehicular Systems,
Mississippi State University
, Mississippi State, MS 39762
Kiran Solanki
Assistant Research Professor
Center for Advanced Vehicular Systems,
Mississippi State University
, Mississippi State, MS 39762
Youssef Hammi
Assistant Research Professor
Center for Advanced Vehicular Systems,
Mississippi State University
, Mississippi State, MS 39762J. Eng. Mater. Technol. Apr 2010, 132(2): 021010 (8 pages)
Published Online: February 19, 2010
Article history
Received:
March 19, 2009
Revised:
September 8, 2009
Online:
February 19, 2010
Published:
February 19, 2010
Citation
Xue, Y., Wright, A. M., McDowell, D. L., Horstemeyer, M. F., Solanki, K., and Hammi, Y. (February 19, 2010). "Micromechanics Study of Fatigue Damage Incubation Following an Initial Overstrain." ASME. J. Eng. Mater. Technol. April 2010; 132(2): 021010. https://doi.org/10.1115/1.4000227
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