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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Extremes 2 (1999), S. 123-147 
    ISSN: 1572-915X
    Keywords: Fatigue limit ; maximum defect ; projection area ; inclusion ; extremes ; Gumbel ; 62N05 ; 60D05
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The method explained in this paper for quantitative evaluation of fatigue limit for materials containing defects is based on the experimental evidences that inhomogeneities and micro-notches can be treated like cracks. First, the basic concept of the √area parameter model is explained introducing the various data obtained by the first author's group for over last 15 years. Evidences are shown that small cracks, defects and nonmetallic inclusions having the same value of the square root of projection area, √area, have the identical influence on the fatigue limit regardless of different stress concentration factors. Various applications of these concepts to various defect types and microstructural inhomogeneities are shown. Since the estimation of fatigue strength is related to the estimation of the size of maximum defects occurring in a piece, the methods for searching the defects and the quality control of materials with respect to inclusion or defect rating as well as their statistical implications are discussed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-1536
    Keywords: Neutron Scattering ; Small-angle Scattering ; Al-Zn Alloys ; Guinier-Preston zone ; Age-hardening
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Die Kleinwinkelstreuung der Neutronen von A1-6.8 at % Zn und Al-6.8 at % Zn- 0.1 at % Mg-Legierungen während der Guinier-Preston-Zonen-Bildung wurde am KUR (Kyoto Universität Reaktor) gemessen. Die Proben wurden aus 300 °C in Salzwasser von — 20 °C abgeschreckt und bei 77 K gehalten. Sie wurden bei 40 °C während der verschiedenen Zeitdauer von 0 bis 1000 Minuten mit der nachfolgenden Neutronenmessung bei 77 K gealtert. Die gemessene zeitliche Entwicklung des Streuquerschnittes kann qualitativ erklärt werden in übereinstimmung mit Saitos Formel, die aus zwei verschiedenen Teilen besteht, die der inkohärenten anomalen Schwankung und der kohärenten geordneten Struktur der Konzentration entsprechen.
    Notes: Summary Small-angle neutron scattering from A1-6.8 at % Zn and Al-6.8 at % Zn-0.1 at % Mg alloys during Guinier-Preston zone formation have been measured at KUR (Kyoto University Reactor). The samples were quenched from 300 °C into brine at -20 °C and kept at 77 K. They were aged at 40 °C for various periods ranging from 0 up to 1000 minutes each with subsequent neutron measurement at 77 K. The observed temporal evolution of the cross section can be interpreted qualitatively in terms of Saito's formula which consists of two distinct parts due to the incoherent anomalous fluctuation and to the coherent ordered structure of the concentration.
    Type of Medium: Electronic Resource
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