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  • METALLIC MATERIALS  (2)
  • Metallic Materials
  • 1990-1994  (2)
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  • 1
    facet.materialart.
    Unknown
    Fatigue mechanics - An assessment of a unified approach to life prediction (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Consideration is given to the development of a total-life prediction methodology for aerospace structures based solely on crack propagation from a microstructural defect at stress concentrations. Crack-growth lives were calculated for a given loading condition by integrating the crack-growth-rate-against-delta K relationships for crack growth from a microstructural defect size to failure. Both small- and large-crack growth rate data were used. The assessment was based on data on 2024-T3 aluminum alloy, 2090-T8E41 aluminum-lithium alloy, annealed Ti-6Al-4V titanium alloy, and high-strength 4340 steel under either constant-amplitude or spectrum loading. Good agreement was found between fatigue lives measured on notched specimens with those computed from the total-life analysis.
    Keywords: METALLIC MATERIALS
    Type: Advances in Fatigue Lifetime Predictive Techniques; Apr 24, 1990; San Francisco, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Fatigue crack initiation and small crack growth in several airframe alloys (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The growth of naturally-initiated small cracks under a variety of constant amplitude and variable amplitude load sequences is examined for several airframe materials: the conventional aluminum alloys, 2024-T3 and 7075-T6, the aluminum-lithium alloy, 2090-T8E41 and 4340 steel. Loading conditions investigated include constant amplitude loading at R = 0.5, 0, -1 and -2 and the variable amplitude sequences FALSTAFF, Mini-TWIST, and FELIX/28. Crack growth was measured at the root of semicircular edge notches using acetate replicas. Crack growth rates are compared on a stress intensity factor basis, to those for large cracks to evaluate the extent of the small crack effect in each alloy. In addition, the various alloys are compared on a crack initiation and crack growth morphology basis.
    Keywords: METALLIC MATERIALS
    Type: Fatigue 90: International Conference on Fatigue and Fatigue Thresholds; Jul 15, 1990 - Jul 20, 1990; Honolulu, HI; United States
    Format: text
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