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  • 1
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    Short fatigue cracks in notched aluminum specimens (1986)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The short-crack fatigue behavior in notched specimens of Al 2024-T3 was studied at values of the stress ratio, R, equal to 0.5, 0.0, -1.0, and -2.0. Crack growth was monitored using a replica technique for cracks ranging in length from a few tens of a micron to the specimen's thickness (2.3 mm). Crack opening displacement was measured for surface cracks as short as 0.035 mm using the interferometric strain/displacement gage, a laser-based optical technique described by Sharpe (1982). It was found that the growth rates of short cracks were faster than the rates of long cracks for R values of -1.0 and -2.0. No significant difference was observed for R = 0.0, and at R = 0.5, the short cracks actually grew more slowly that the long ones. At all R values, the closure stresses measured for short cracks were smaller than those predicted for large cracks.
    Keywords: METALLIC MATERIALS
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    NASA TECHNICAL REPORTS
  • 2
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    Benchmark cyclic plastic notch strain measurements (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Plastic strains at the roots of notched specimens of Inconel 718 subjected to tension-compression cycling at 650 C are reported. These strains were measured with a laser-based technique over a gage length of 0.1 mm and are intended to serve as 'benchmark' data for further development of experimental, analytical, and computational approaches. The specimens were 250 mm by 2.5 mm in the test section with double notches of 4.9 mm radius subjected to axial loading sufficient to cause yielding at the notch root on the tensile portion of the first cycle. The tests were run for 1000 cycles at 10 cpm or until cracks initiated at the notch root. The experimental techniques are described, and then representative data for the various load spectra are presented. All the data for each cycle of every test are available on floppy disks from NASA.
    Keywords: METALLIC MATERIALS
    Type: ASME, Transactions, Journal of Engineering Materials and Technology (ISSN 0094-4289); 105; 235-241
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    NASA TECHNICAL REPORTS
  • 3
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    Closure measurements of naturally initiating small cracks (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The initiation and growth of cracks in smooth 2024-T3 aluminum specimens have been investigated using acetate replicas. Crack opening displacements were measured as a function of load at several positions along the crack as it grew across the thickness of the specimen and became a through-the-thickness crack of a few millimeters in length. Tests run for R-ratios of 0.5, 0.0 and -1.0 showed that closure loads were well predicted by Newman's (1984) model. It is noted that small cracks grow slightly faster than would be predicted by long-crack data, and it is suggested that effects other than plasticity-induced closure must be taken into account.
    Keywords: METALLIC MATERIALS
    Type: Engineering Fracture Mechanics (ISSN 0013-7944); 30; 3 19; 275-279
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    NASA TECHNICAL REPORTS
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