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  • 1
    Publication Date: 2019-06-27
    Description: Analytical techniques were developed to evaluate braided hoses and bellows for possibility of flow induced resonance. These techniques determine likelihood of high cycle fatigue failure when such resonance exists.
    Keywords: MECHANICS
    Type: MFS-19004
    Format: application/pdf
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  • 2
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    In:  Other Sources
    Publication Date: 2019-06-28
    Description: Life expectancy of cast aluminum machine parts can be predicted accurately from fatigue tests at 78 K on notched specimens of aluminum alloy. Method was developed for rocket engine turbopump parts made of high strength, heat treatable alloy with high silicon content; however, technique is applicable to other aluminum casting alloys.
    Keywords: MECHANICS
    Type: MFS-19549 , NASA Tech Briefs (ISSN 0145-319X); 5; 2; P. 204
    Format: text
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  • 3
    Publication Date: 2019-07-13
    Description: Life prediction curves for rocket engine pump parts were developed from the results of high-cycle fatigue tests run on cast-aluminum specimens. Notched and smooth specimens were cyclically tested at different mean stress levels at -320 F (78 K). The notch size and mean stress enveloped the design operating conditions. Local stress computed in the groove of the notched specimen was used to represent its fatigue strength. The von Mises criterion was used to determine effective cyclic stresses. The Goodman rule was applied to determine equivalent reversed alternating stresses. The procedure permitted the notched and smooth data sets to each be described by a single curve. High-cycle fatigue life curves were provided for the stress state, mean stress, and stress concentration spanned by the data.
    Keywords: METALLIC MATERIALS
    Type: Methods for predicting material life in fatigue; Dec 02, 1979 - Dec 07, 1979; New York, NY
    Format: text
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  • 4
    Publication Date: 2019-07-13
    Description: Samples of two nickel-base casting alloys, Mar-M-246 (a Martin Company alloy) and 713LC (a low-carbon modification of the alloy 713C developed by International Nickel Company) were tested as candidate materials for the high-pressure fuel and high-pressure oxidizer turbopump turbine nozzles. The samples were subjected to tensile tests and to low cycle fatigue tests in high-pressure hydrogen to study the influence of the hydrogen environment. The Mar-M-246 material was found to have a three times higher cyclic life in hydrogen than the 713LC alloy, and was selected as the nozzle material.
    Keywords: METALLIC MATERIALS
    Type: Effect of hydrogen on behavior of materials; Sep 07, 1975 - Sep 11, 1975; Moran, WY
    Format: text
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