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A technique to measure fatigue crack growth threshold

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Abstract

An experimental technique for determining fatigue crack growth threshold is presented. This experimental technique uses an increasing ΔK step loading procedure to determine threshold going from a no-growth to growth status. Stress relief annealing of the Ti-6AI-4V test specimens eliminates load history effects normally associated with the precrack, providing a measurement equivalent to what is achieved by a standard ASTM load shed test. In addition to measuring load history free thresholds, this increasing ΔK technique can be used to investigate different load history effects on threshold by using the threshold step measurement with different precrack histories and without the subsequent annealing process. Verification of the threshold step measurement is demonstrated by comparing measurements with standard ATSM load shed testing results.

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References

  1. Moshier, M.A., Hillberry, B.M., andNicholas, T., “The Effect of Low-cycle Fatigue Cracks and Loading History on the High Cycle Fatigue Threshold,”in Fatigue and Fracture Mechanics, STP 1389, G.R. Halford andJ.P. Gallagher (eds.),American Society for Testing and Materials West Conshohocken, PA (1999).

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Authors and Affiliations

  1. Wright-Patterson AFB, AFRL/MLLM, 45433, OH

    M. A. Moshier (Senior Research Scientist)

  2. RHAMM Technologies, 45434, Beavercreek, OH

    M. A. Moshier (Senior Research Scientist)

  3. University of Dayton Research Institute, 300 College Park, 45469-0128, Dayton, OH

    K. E. Goecke (Chief Mechanical Technician)

Authors
  1. K. E. Goecke
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  2. M. A. Moshier
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Goecke, K.E., Moshier, M.A. A technique to measure fatigue crack growth threshold. Experimental Mechanics 42, 182–185 (2002). https://doi.org/10.1007/BF02410881

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  • DOI: https://doi.org/10.1007/BF02410881

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