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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    International journal of fracture 19 (1982), S. 203-220 
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé Le mémoire est relatif à une tentative d'étude des facteurs d'intensité de contrainte relatifs à des fissures de bord parallèles et obliques de longuers égales et inégales soumises à tension. On étudie les effets de la variation de longueurs des fissures, de l'angle de leur inclinaison, et de la distance entre les fissures sur les facteurs d'intensité de contrainte dans les modes d'ouverture et de glissement. Les observations expérimentales montrent que lorsque les fissures sont espacées d'une grandeur égale ou supérieure à la longueur des fissures de bord obliques parallèles et égales, la dimension des caustiques relatives aux fissures dans une éprouvette sous charge est proche de celle relative à une fissure de bord simple oblique possédant le même angle d'inclinaison. Dans le cas de fissures de bords parallèles obliques inégales, un phénomène de fermeture de fissure a été étudié, ainsi que son apparition en fonction de la longueur des fissures et de l'espacement entre celles-ci. Il a été observé que le diamètre transversal de la caustique relative aux fissures plus courtes devient faible et négligeable lorsque la position des fissures courtes par rapport aux fissures les plus longues devient plus petite que la moitié de l'espacement entre les fissures.
    Notes: Abstract This paper reports on an attempt to investigate the stress intensity factors of equal and unequal oblique parallel edge cracks subjected to tension. The effects of the variation of the length of the cracks, angle of inclination, and crack spacings on the stress intensity factors (opening and sliding modes) were studied. Experimental observations show that, for crack spacings equal or larger than the length of the equal oblique parallel edge cracks, the size of the caustics for the cracks in the loaded specimen approach that of a single oblique edge crack with the same angle of inclination. In the case of unequal oblique parallel edge cracks, a crack closure phenomenon and its occurrance with respect to the length of the cracks and crack spacings were investigated. It was observed that the transverse diameter of the caustic for the shorter cracks became small and negligible when the position of the shorter cracks with respect to the longer cracks became smaller than half of the crack spacings.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    International journal of fracture 27 (1985), S. R17 
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 1985-01-01
    Print ISSN: 0376-9429
    Electronic ISSN: 1573-2673
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 4
    Publication Date: 1982-07-01
    Print ISSN: 0376-9429
    Electronic ISSN: 1573-2673
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 5
    Publication Date: 2019-07-18
    Description: Aluminum-Lithium (Al-Li) alloys offer significant performance benefits for aerospace structural applications due to their higher specific properties compared with conventional Al alloys. For example, the application of Al-Li alloy 2195 to the space shuffle external cryogenic fuel tank resulted in weight savings of over 7,000 lb, enabling successful deployment of International Space Station components. The composition and heat treatment of 2195 were optimized specifically for strength-toughness considerations for an expendable cryogenic tank. Time-dependent properties related to reliability, such as thermal stability, fatigue, and corrosion, will be of significant interest when materials are evaluated for a reusable cryotank structure. Literature surveys have indicated that there is limited thermal exposure data on Al-Li alloys. The effort reported here was designed to establish the effects of thermal exposure on the mechanical properties and microstructure of Al-Li alloys C458, L277, and 2195 in plate gages. Tensile, fracture toughness, and corrosion resistance were evaluated for both parent metal and friction stir welds (FSW) after exposure to temperatures as high as 300 F for up to 1000 hrs. Microstructural changes were evaluated with thermal exposure in order to correlate with the observed data trends. The ambient temperature parent metal data showed an increase in strength and reduction in elongation after exposure at lower temperatures. Strength reached a peak with intermediate temperature exposure followed by a decrease at highest exposure temperature. Friction stir welds of all alloys showed a drop in elongation with increased length of exposure. Understanding the effect of thermal exposure on the properties and microstructure of Al-Li alloys must be considered in defining service limiting temperatures and exposure times for a reusable cryotank structure.
    Keywords: Metals and Metallic Materials
    Type: AMPET; Sep 16, 2002 - Sep 18, 2002; Huntsville, AL; United States
    Format: text
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  • 6
    Publication Date: 2019-07-13
    Description: This paper presents viewgraphs on the effects of thermal exposure on the mechanical properties of both developmental and production mature Al-Li alloys. The topics include: 1) Aluminum-Lithium Alloys Composition and Features; 2) Key Characteristics of Al-Li Alloys; 3) Research Approach; 4) Available and Tested Material; and 5) Thermal Exposure Matrix. The alloy temperatures, gage thickness and product forms show that there is no deficit in mechanical properties at lower exposure temperatures in some cases, and a significant deficit in mechanical properties at higher exposure temperatures in all cases.
    Keywords: Metals and Metallic Materials
    Type: AMPET 2002 Conference; Sep 16, 2002 - Sep 18, 2002; Huntsville, AL; United States
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