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ASTM Selected Technical Papers
Fatigue and Fracture Mechanics: 31st Volume
By
GR Halford,
GR Halford
1
NASA Glenn Research Center
at Lewis Field; Cleveland, OH
; Symposium Chairman and Editor
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JP Gallagher
JP Gallagher
2
University of Dayton Research Institute
, Dayton, OH
; Symposium Chairman and Editor
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ISBN-10:
0-8031-2868-1
ISBN:
978-0-8031-2868-2
No. of Pages:
560
Publisher:
ASTM International
Publication date:
2000
eBook Chapter
The Effect of Low Cycle Fatigue Cracks and Loading History on High Cycle Fatigue Threshold
By
MA Moshier
,
MA Moshier
1
Air Force Research Laboratory, Materials and Manufacturing Directorate (AFRL/MLLN)
, Wright-Patterson AFB, OH 45433-7817
.
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T Nicholas
,
T Nicholas
1
Air Force Research Laboratory, Materials and Manufacturing Directorate (AFRL/MLLN)
, Wright-Patterson AFB, OH 45433-7817
.
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BM Hillberry
BM Hillberry
2
Purdue University, School of Mechanical Engineering
, West Lafayette, IN 47907
.
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Page Count:
18
-
Published:2000
Citation
Moshier, M, Nicholas, T, & Hillberry, B. "The Effect of Low Cycle Fatigue Cracks and Loading History on High Cycle Fatigue Threshold." Fatigue and Fracture Mechanics: 31st Volume. Ed. Halford, G, & Gallagher, J. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959 : ASTM International, 2000.
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The high cycle fatigue (HCF) resistance of Ti-6Al-4V for gas turbine engine pplications is studied when the material is first subjected to low cycle fatigue (LCF). The high cycle fatigue (HCF) threshold is determined after small LCF surface cracks are formed in notch tension specimens. LCF loading at two stress ratios, R = 0.1 and R -1.0, is used to initiate the LCF cracks, which are detected using direct current potential difference (DCPD). The surface crack sizes are measured under load using a static loading fixture and a scanning electron microscope (SEM). In addition to the SEM surface measurements, heat tinting is used to mark the crack profiles before HCF testing so that fractography can be used after failure to measure the 2D crack geometry. The LCF surface-cracked specimens are tested at room temperature in lab air at 600 Hz using a step-loading procedure at two stress ratios, R = 0.1 and R = 0.5. The LCF loading history is found to affect the HCF threshold compared to what is predicted from long crack threshold values obtained from other crack geometries. Variations in HCF crack growth thresholds obtained on specimens with LCF crack sizes from 25 to 175 μm are attributed to overload and underload effects from the LCF precracking.
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