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  • 1
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Microbiology 47 (1993), S. 855-874 
    ISSN: 0066-4227
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Genetics 19 (1985), S. 355-387 
    ISSN: 0066-4197
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 12 (1989), S. 0 
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract— Two damage models were implemented into the finite element program ADINA to study the correlation between microscopical damage and macroscopical material failure. In the first model, based on the Gurson yield function the nucleation, growth and the coalescence of voids were incorporated into the constitutive relations. In the second model the void growth was determined according to the Rice and Tracey model using the von Mises yield function, and material failure was simulated by eliminating the elements where the critical void growth ratio was exceeded. The numerical results for the local and global behaviour of the specimens were compared with experiments. The generality of the damage parameters was checked by investigating several specimen geometries. Both damage models deliver qualitatively consistent results with regard to the influence of the stress triaxiality on the void growth and on the beginning of the material failure. However, the Gurson model gives a more accurate numerical simulation because the damage development and the stress drop continue after the onset of void coalescence while the critical void growth model causes less convergence problems in the simulation of large crack extension. The Jn-curve was estimated on the basis of both models.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 11 (1980), S. 387-399 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Experimental Investigations on Structural Member Toughness with Several Pressure Vessel MaterialsFormer bursting tests and strain measurements with model vessels of boiler plate and of low temperature steel gave already informations on toughness behaviour of such structural members at temperatures down to -140°C. This paper deals with similar tests on vessels of fine grain steels and gives a final evaluation of all these experiments. Characteristic deformation and fracture phenomena are found at the changing from tough to brittle behaviour according to ductility of the different materials. Materials data as impact transition temperature and Robertson crack arrest temperature as well as pressure to yield during the bursting test may be used to estimate safety in calculation of pressure vessels. The results of these experiments lead to stress analytic investigations which are reported in a further paper.
    Notes: Kenntnisse über das Zähigkeitsverhalten von Behältern unter Innendruck wurden durch Berstversuche mit Verformungsmessungen an Modellbehältern verschiedener Konstruktionsform aus den Werkstoffen Kesselblech HI/HII und Tieftemperaturstahl TTSt. 35 N bereits in früheren Untersuchungen gewonnen. Diese Ergebnisse werden ergänzt durch analoge Versuche an Behältern aus den Feinkornbaustählen TTSt.E36 und St.E47, über die hier schwerpunktmäßig berichtet wird. Durch Absenken der Temperatur findet man charakteristische Verformungs- und Brucherscheinungen, die den Übergang vom zähen zum spröden Verhalten der Bauteile je nach der Duktilität der einzelnen Werkstoffe kennzeichnen. Aus Werkstoffkennwerten wie Kerbschlagübergangstemperatur und Rißauffangtemperatur nach Robertson sowie aus dem Druck für den Fließbeginn während des Berstversuches können die in jedem Fall vorhandene Verformungsreserve und die Sicherheit bei der Bauteilauslegung nach den Regeln der Technik abgeschätzt werden. Die experimentellen Befunde bilden die Voraussetzung und zugleich die Bestätigung für spannungsanalytische Untersuchungen, über die in einem weiteren Aufsatz berichtet wird.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 11 (1980), S. 400-411 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Theoretic-numerical Stress Analysis and Failure Assessment of Pressure VesselsAn extensive research program has been conducted to technically evaluate the burst behaviour of model vessels with nozzles as a function of the dimensions and material toughness. As a supplement of this program, the stresses in the vicinity of the nozzle under internal pressure were analysed using the Finite Element Method. The ratio of the wall thickness of the vessel and nozzle were varied. By applying different failure hypotheses, the trend of the experimental burst pressure with temperature could be established.
    Notes: Zur Ergänzung eines umfangreichen Forschungsprogramms, dessen Ziel war, sicherheitstechnisch das Berstverhalten von Modellbehältern mit Stutzen in Abhängigkeit von deren Dimensionierung und der Zähigkeit der benutzten Werkstoffe auszuwerten, wurden die unter Innendruck auftretenden lokalen Beanspruchungen im Stutzenbereich mit Hilfe der Methode der Finiten Elemente analysiert. Hierbei wurde das Verhältnis der Wanddicken von Klöpperboden und Stutzen variiert. Durch Anwendung verschiedener Versagenshypothesen konnte der experimentell ermittelte Verlauf des Berstdrucks über der Temperatur in der Tendenz bestätigt werden.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
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