A technique to measure fatigue crack growth threshold |
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Authors: | K E Goecke M A Moshier |
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Institution: | (1) Wright-Patterson AFB, AFRL/MLLM, 45433, OH;(2) RHAMM Technologies, 45434 Beavercreek, OH;(3) University of Dayton Research Institute, 300 College Park, 45469-0128 Dayton, OH |
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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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Keywords: | fatigue crack growth threshold titanium experimental testing |
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