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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 67 (1997), S. 191-199 
    ISSN: 1432-0681
    Keywords: Key words powder metals ; compaction ; friction ; FE method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The compaction process of iron powder is considered. Due to negligible elastic strains the rigid-plastic model is applied. A yield condition containing the first stress invariant is used. All material functions depend on the relative density of the powder, which changes during the compaction process. Siebel friction law is applied, and the friction factor is considered to be depending on the relative density. Various material functions are applied in the numerical simulation, and the results are compared with experimentally obtained data. The best fitting material functions and friction factors are obtained.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta mechanica 21 (1975), S. 93-113 
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Summary Large plane rotationally symmetric plastic deformations are examined, of a continuous body which obeys the Coulomb yield condition and the associated flow rule. In this way, the kinematics of the Couette flow of a “granular” material formed by parallel needles (Schneebeli) can be satisfactorily predicted even if the individual rotation of the “grains” is included, and if therefore a plastic Cosserat-Continuum is considered. The consequently existing couple stresses as well as the asymmetric components of shear stress may, however, be quantitatively neglected — which result gives another evidence of the fact that generalized continua are important for their kinematics rather than for their statics.
    Notes: Zusammenfassung Es werden große ebene, rotationssymmetrische, plastische Formänderungen eines Kontinuums studiert, das dem Coulombschen Fließkriterium und der assoziierten Fließregel genügt. Damit läßt sich die Couette-Strömung eines aus parallelen Nadeln zusammengesetzten “granularen” Materials (Schneebeli) kinematisch qualitativ zufriedenstellend vorhersagen, auch wenn man die Eigenrotation der “Körner” mit einbezieht und dementsprechend ein plastisches Cosserat-Kontinuum zugrunde legt. Hingegen sind die auftretenden Momentenspannungen ebenso wie die asymmetrischen Schubspannungsanteile größenmäßig zu vernachlässigen — ein weiterer Hinweis darauf, daß verallgemeinerte Kontinua mehr von der Kinematik als von der Statik her Bedeutung besitzen.
    Type of Medium: Electronic Resource
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