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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 18 (1987), S. 225-228 
    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: Thermal Stability of Residual Stresses in Shot Peened Surfaces.In industry shop peening represents a well-known process to improve the fatigue properties of metallic components. However, the beneficial effect of the induced compressive residual stresses can be reduced if a component is subjected to higher temperatures during service. In this work the relief of the residual stresses as a function of time and temperature is calculated for a 12 %-chromium steel. Specifically, the results can be used for the prediction of the stress relief behaviour of gas turbine compressor blades. This model can also be applied to the determination of the mechanisms which are responsible for the residual stress relief. At temperatures above approximately 300 °C in this material the dominating mechanism is diffusion controlled creep whereas at lower temperatures the stress relief is caused by logarithmic creep.
    Notes: In der Industrie wird das Kugelstrahlen häufig zur Verbesserung der Ermüdungseigenschaften von metallischen Bauteilen eingesetzt. Andererseits ist bekannt, daß sich der positive Effekt der Druckeigenspannungen vermindert, falls ein Bauteil einer erhöhten Temperatur im-Betrieb ausgesetzt ist. In der vorliegenden Arbeit wird der Abbau der Eigenspannungen als Funktion der Zeit und der Temperatur für einen Turbinenschaufelstahl (X 22 CrMo V 121) berechnet. Mit den Ergebnissen ist es insbesondere möglich, eine Vorhersage des thermischen Eigenspannungsabbaus vorzunehmen sowie die Mechanismen zu bestimmen, die für den Eigenspannungsabbau verantwortlich sind. Bei Temperaturen oberhalb etwa 300 °C ist der vorherrschende Mechanismus diffusionskontrolliertes Kriechen, während bei Temperaturen darunter der Eigenspannungsabbau dem logarithmischen Kriechen zuzuschreiben ist.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 67 (1995), S. 1107-1108 
    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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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 3 (1949), S. 281-285 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Es wird ein einfaches Verfahren angegeben, den Transport von Wasser durch Textilfaserschichten zu messen, die einerseits in Wasser tauchen und andererseits an Luft mittlerer relativer Feuchtigkeit grenzen. Proteinfasern transportieren das Wasser langsam, Baumwolle rascher und Viskosekunstfasern sehr rasch.
    Additional Material: 2 Tab.
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  • 4
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Polyesters are synthetized by reaction of epoxides and dicarboxylic acid anhydrides. It is possible to use the carbonates of diols instead of the epoxides. Alkali salts catalyze this reaction. Polyesters with an average molecular weight up to 90,000 are obtained.
    Notes: Polyester werden aus Epoxyden und Dicarbonsäureanhydriden hergestellt. An Stelle der Epoxyde können auch Carbonate von Diolen angewendet werden. Alkalisalze beschleunigen diese Reaktion. Es werden Polyester mit einem Durchschnittsmolekulargewicht bis zu 90,000 erhalten.
    Additional Material: 12 Ill.
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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: 2,4,6-Trinitrotoluene (TNT) was found to react in aqueous solution with surfactants containing amino and quaternary ammonium groups at pH 10-11 at ambient temperature. The surfactants investigated included N-tallow 1,3-diaminopropane, trimethyl N-tallow ammonium chloride and N,N,N′,N′,N′-pentamethyl N-tallow 1,3-propane diammonium dichloride. The reaction products were insoluble in water and readily separated through filtration. The dried solids were not explosive and the solids burned without explosion. The results showed that TNT can be reduced to less than 0.1 ppm from the initial concentration of 110 ppm in 2-3 hours. The wastewater of Composition B contains TNT and 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX). Treatment of the wastewater with the ammonium cationic surfactants showed that TNT was removed quantitatively by precipitation and RDX was simultaneously hydrolyzed. The mechanism of this treatment is discussed.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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