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  • Polymer and Materials Science  (5)
  • Industrial Chemistry
  • 1980-1984  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 263-271 
    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: Extrusion Manufacturing Possibilities of Fibre Composite Materials like the Combination Metal/GraphiteThese paper discusses the possibilities of manufacturing composite materials by common extrusion of envelope tubes and wrapped wires. Experimental results are given and analysed from the material combination graphite/metal.If a great lot of thin wrapped wires are concentrated in an envelope tube (“multi-core” coextrusion), perfect indirect coextrusion only will be possible, if the compound billet is compacted before extrusion. If few thick wrapped wires are concentrated in an envelope tube (“polycore” coextrusion), perfect indirect coextrusion is possible without compacting the compound billet before extrusion. Through indirect reiterate extrusion, using always the same tools and the same small extrusion ratio, it is possible to get a good product only by extrusion. Hydrostatic “multi-core” coextrusion is possible without compacting the compound billet, but the billet preparation needs more work. The envelope tube must have a solid top with the same angle like the die. It is effective to use dies with small angles. The manufacturing of wrapped wires only by extrusion is possible and effective. All variations of extrusion are available for employment.There is no difference in structure between products manufacturing by “multi-core” coextrusion or by drawing.From the geometrical configuration of the wrapped wires in the envelope tube results a different structure by use of indirect reiterate coextrusion.
    Notes: Möglichkeiten der Verbundwerkstoffherstellung durch Strangpressen von Manteldrahtbündeln werden erörtert und am Beispiel der Werkstoffkombination Metall/Graphit experimentell untersucht.Werden dünne Manteldrähte in großer Anzahl in einem Hüllrohr gebündelt (Vieldrahtverbundpressen), so ist ein indirektes Verbundpressen dann möglich, wenn der Block vorkompaktiert wird.Werden relativ dicke Manteldrähte in geringer Anzahl in einem Hüllrohr gebündelt (Mehrdrahtverbundpressen), so ist ein indirektes Verbundpressen ohne Vorkompaktierung des Blockes möglich.Durch wiederholtes indirektes Strangpressen im gleichen Werkzeugsatz läßt sich bei kleinen geometrischen Verpressungsverhältnissen ein Produkt zufriedenstellender Qualität ausschließlich durch Strangpressen herstellen.Ein hydrostatisches Vieldrahtpressen ist auch ohne Blockvorkompaktierung möglich, jedoch erfordert die Blockvorbereitung dadurch größeren Aufwand, daß das Hüllrohr eine angearbeitete, dem Matrizenwinkel angepaßte, Spitze besitzen muß. Bei diesem Verfahren ist es zweckmäßig, Matrizen kleinen Einlaufwinkels zu verwenden.Die Manteldrahtherstellung durch Strangpressen ist möglich und zweckmäßig. Alle Varianten des Strangpressens können hierzu herangezogen werden.Die erzielbaren Verbundwerkstoffstrukturen entsprechen beim Vieldrahtpressen in ihrer Gleichmäßigkeit denen, die bei der Fertigung durch Ziehen erhalten werden. Diese ausgezeichnete Geometrie wird beim Wiederholungspressen nicht ganz erreicht.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 315-324 
    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: Behaviour of Hip - Joint Endoprostheses under quasi-static and dynamic LoadClinical experience with total-hip endoprostheses has shown that the following problems take priority: - Loosening of the socket (acetabular cup) and the femoral prosthesis - Fracture of the femoral prosthesis - Loosing due to deep infection.Accordingly aims the research at locating the biological and mechanical reasons for the failures as well as testing alternative solutions such as - methods of fixation - construction of protheses - new materials and finishing methods. This publication concerns areas of the mechanical side of the problem.The comparison between the original system of proximal femur and acetabulum and the implanted prosthetic system shows changes in the stiffness of the systems depending on the different types of implanted endoprostheses.The influence of the frequency of loading on the deformation of the system is investigated in a frequency range between quasi-static and dynamically changing loads.The movements between implanted cup and neighbouring pelvic bone during cyclic load is measured.The results of these examinations give clues concerning qualitative and quantitative repercussions from the different endoprosthetic systems under conditions optimal in view of true comparison, and possible or desirable alternative solutions of the problem in view of construction and material.
    Notes: Aufgrund bisher vorliegender klinischer Erfahrungen mit Hüftgelenks-Totalendoprothesen nehmen folgende Problemstellungen eine gewisse Priorität ein: - Pfannen- und Schaftlockerungen, - Schaftbrüche - Infektlockerungen.Dementsprechend konzentriert sich die Forschung auf die Ermittlung der biologischen und mechanischen Ursachen des Fehlverhaltens sowie auf die Erprobung alternativer Lösungen hinsichtlich - Fixationsmethodik - Konstruktion von Endoprothesen - Werkstoff und Fertigungsmethoden.Die vorliegende Arbeit bezieht sich auf Teile des mechanischen Komplexes dieser Problemstellung.Durch vergleichende Untersuchungen am Original- sowie am Implantatsystem „proximaler Femur/Hüftgelenkspfanne“ wird die Änderung der Steifigkeit infolge Implantation unterschiedlicher Typen von Endoprothesen ermittelt.Der Einfluß der Belastungsfrequenz auf die Deformationsverhältnisse in diesem System wird in einem Frequenzbereich überprüft, der sich von quasi-statischer bis zu dynamisch-wechselnder Belastung erstreckt.Die Relativbewegung zwischen implantierter Hüftgelenkspfanne und benachbartem knöchernen Bereich wird bei zyklischer Belastung erfaßt und messend verfolgt.Die Befunde geben punktuelle Hinweise hinsichtlich qualitativer und quantitativer Auswirkungen unterschiedlicher endoprothetischer Maßnahmen unter Bedingungen optimierter Vergleichbarkeit sowie hinsichtlich möglicher oder zweckmäßiger alternativer Lösungen im konstruktiven und stofflichen Bereich der anstehenden Fragestellungen.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 21 (1983), S. 785-789 
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Swaminathan and Rajagopalan (S and R) have recently published a parameter study describing the dependence of important detonation characteristics of C—H—N—O explosives on their densities and enthalpies of formation which is seriously inconsistent with earlier highly reliable calculations by Mader using the same equation of state and presumably the same input information. S and R's computer-based conclusions are also not in accord with parametric relationships established over a decade ago by Johansson and Persson and Kamlet and Jacobs. S and R's calculated detonation pressures are significantly lower at high loading densities and higher at lower loading densities than Mader's corresponding calculations. Also out of line on the high side (compared with Mader's calculations or experimentally observed values) are S and R's calculated detonation velocities. The differences between S and R's parametric relationships and those of the other workers can have important and misleading implications to the planning of future explosives chemistry research. It is suggested to those interested in such parametric studies that the simplified method for detonation property calculation be used, since the input information is explicit and easily checked and the results are at least as reliable as those from complex computer programs.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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