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  • Oxford University Press  (343)
  • Wiley-Blackwell  (27)
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  • 1
    Electronic Resource
    Electronic Resource
    Cationic polymerization of 1,3-pentadiene in the presence of alkyl halides (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 2087-2090 
    Details
    ISSN: 0887-624X
    Keywords: 1,3-pentadiene ; Cationic Polymerization ; crosslinking ; chain transfer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No Abstract
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1995.080331216
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  • 2
    Electronic Resource
    Electronic Resource
    The particle size of latexes from dispersion polymerization of styrene using poly(ethylene oxide) macromonomer as a polymerizable stabilizer (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 3575-3583 
    Details
    ISSN: 0887-624X
    Keywords: latexes ; dispersion polymerization ; styrene ; PEO macromonomer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The particle sizes and their size distributions of latexes from the dispersion polymerization of styrene using a small amount of ω-methoxy poly(ethylene oxide)n undecyl-α-methacrylate macromonomer (PEO-R-MA-40) as a polymerizable stabilizer in ethanol-water media have been studied. Monodisperse or/and nearly monodisperse latex particles from 0.1 to 1 μm in diameter were readily obtained. The diameter of latex particles follows the relationship Dvad ∝ θ0.33 [PEO-R-MA-40]-0.60 [styrene]01.02 [AIBN]o-0.09, where θ is the fractional conversion of styrene. Except for the styrene concentration dependency, this relationship is in excellent agreement with the model developed by Paine11 and modified by Kawaguchi et al.13 When the surface composition of the grafted PEO macromonomer on the latex particles exceeded 16% as analyzed by X-ray photoelectron spectroscopy (XPS), the particles were nearly monodisperse. In terms of polymerization, this occurred around 18% conversion of styrene. Beyond this critical state of polymerization, the latex particles grew bigger with more PEO macromonomer-styrene copolymers situated on the particle surface. The effect of various factors on the particle size distribution is also discussed. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 3575-3583, 1997
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of benzylic halides on cationic polymerization of 1,3-pentadiene (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 1815-1818 
    Details
    ISSN: 0887-624X
    Keywords: 1,3-pentadiene ; cationic polymerization ; crosslinking ; chain transfer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Dauerschwingfestigkeit und zyklisches Werkstoffverhalten (1989)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 20 (1989), S. 327-332 
    Details
    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: Fatigue Limit and Cyclic Material BehaviourFatigue tests to determine the fatigue limit are very timeconsuming. Therefore a lot of possibilities have been proposed to estimate the fatigue limit, especially the so-called correlation formulae. This paper shows for carbon and low alloy steel, that the correlation between fatigue limit σW (unnotched specimen, tension-compression, mean-stress equal zero) and cyclic yield strength R′p0.2 is better than between fatigue limit and static tensile strength Rm or static yield strength Rp0,2. An additional improvement of this correlation is possible by fixing the fatigue limit on the level of the cyclic stress for a plastic strain amplitude εa, p = 0,026%. These results are based on 24 test series taken from the data collection [7].
    Notes: Die experimentelle Ermittlung der Dauerfestigkeit ist aufwendig, so daß man versucht, sie mit Hilfe von Kurzverfahren und sog. Korrelationsformeln abzuschätzen. In der vorliegenden Arbeit wird für unlegierte und niedriglegierte Stähle gezeigt, daß zwischen der Werkstoff-Dauerfestigkeit σW (glatte Probe, axiale Beanspruchung, Mittelspannung null) und der zyklischen Streckgrenze R′p0,2 eine engere Korrelation besteht als zu den statischen Kennwerten Rm und Rp0,2. Eine weitere Verbesserung ergibt sich, wenn die Dauerfestigkeit gleich der zyklischen Spannung bei einer plastischen Dehnungsamplitude εa, p = 0,026% gesetzt wird, σW = σ0,026.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19890201007
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  • 5
    Electronic Resource
    Electronic Resource
    Berechnung der Dauerschwingfestigkeit bei mehrachsiger Beanspruchung  -  Teil 1 (1993)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 24 (1993), S. 240-249 
    Details
    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: Estimation of Endurance Limit under Multiaxial LoadingMultiaxial criteria for endurance limit prediction of metallic materials will be discussed in this paper. The Shear Stress Intensity Hypothesis SIH is improved under consideration of the variable fatigue limit ratio τw/σw and mean stress effects. Fatigue behaviour under synchronous and nonsynchronous stresses and influences such as mean stresses, out-of-phase stresses, different frequencies, nonsinusoidal stress time function are analysed theoretically and verified with test results. The prediction according to SIH shows good agreement with the test results. Based on an extensive statistical investigation it can be recommended to use the SIH for „crack free materials“ and the normal stress hypothesis NSH for „materials with cracks“.For components the hypothesis SIH and NSH are developed under consideration of the notch effect. In this study a concept for the prediction of endurance limit under multiaxial loads has been developed.
    Notes: Behandelt werden Festigkeitshypothesen für die Dauerschwingfestigkeit metallischer Werkstoffe bei mehrachsiger Beanspruchung. Die Schubspannungsintensitätshypothese SIH wird hinsichtlich der Berücksichtigung des variablen Wechselfestigkeitsverhältnisses und des Mittelspannungseinflusses weiterentwickelt. Im einzelnen wird das Dauerschwingfestigkeitsverhalten metallischer Werkstoffe bei synchron schwingenden und komplexen zusammengesetzten Beanspruchungen dargestellt. Einflüsse wie Mittelspannung, Phasenverschiebung, Frequenzunterschied und Schwingungsform werden im einzelnen rechnerisch analysiert und experimentell verifiziert. Bei allen experimentell untersuchten Fällen trifft die SIH im allgemeinen zu. Durch die statistische Auswertung anhand von Versuchsergebnissen wird die Schubspannungsintensitätshypothese für „rißfreie Werkstoffe“ und die Normalspannungshypothese für „rißbehaftete Werkstoffe“ zur praktischen Anwendung empfohlen.Die empfohlenen Festigkeitshypothesen werden auf Bauteile erweitert. Aus der vorliegenden Untersuchung wird ein Konzept zur Berechnung der Dauerschwingfestigkeit bei mehrachsiger Beanspruchung abgeleitet.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19930240706
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  • 6
    Electronic Resource
    Electronic Resource
    Berechnung von Bauteilwöhlerlinien unter Berücksichtigung der statistischen und spannungsmechanischen StützzifferHerrn Prof. Dr.-Ing. Dr.-Ing. E. h. Dr. Sc. h. c. K. H. Kloos zum 65. Geburtstag gewidmet (1995)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 26 (1995), S. 14-21 
    Details
    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: Estimation of S-N Curves under Consideration of Geometrical and Statistical Size EffectsIn this paper a concept for the estimation of fatigue limit in [11] will be extended to the calculation of S-N curves. The statistical size effect is taken into account with the well known weakest link theory. The geometrical size effect is considered according to the cyclic plastic deformation in the notch root. This model gives good correlation with test results.According to the present model the slope of the S-N curve depends on the specimen size and strength of materials, but does not depend on the stress concentration factor. The S-N curve becomes flatter with larger notch size and higher material strength.
    Notes: Im vorliegenden Beitrag wird ein Modell zur Dauerfestigkeitsberechnung in [11] auf den Zeitfestigkeitsbereich erweitert. Berücksichtigt werden der statistische Größeneinfluß nach dem Fehlstellenmodell und die spannungsmechanische Stützwirkung infolge der plastischen Verformung im Kerbgrund. Das vorgestellte Modell wird für die Grenzfälle besonders analysiert und mit Versuchsergebnissen aus der Literatur verifiziert. Nach dem vorgestellten Modell ist die Neigung der Wöhlerlinie von der Wechselfestigkeit des Werkstoffes und von der Kerbgrundgröße abhängig und unabhängig von der Formzahl. Die Wöhlerlinie wird desto flacher, je größer die Kerbgrundgröße ist und je höherfester der Werkstoff ist.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19950260106
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  • 7
    Electronic Resource
    Electronic Resource
    Berechnung der Dauerschwingfestigkeit bei mehrachsiger Beanspruchung  -  Teil 2 (1993)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 24 (1993), S. 296-303 
    Details
    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
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19930240808
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  • 8
    Electronic Resource
    Electronic Resource
    Berechnung der Dauerschwingfestigkeit unter Berücksichtigung der spannungsmechanischen und statistischen Stützziffer (1991)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 22 (1991), S. 187-196 
    Details
    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: Fatigue Limit and Geometrical and Statistical Size EffectThe ratio of the fatigue limit of an unnotched specimen to that of a notched one, the fatigue notch factor Kf, is usually smaller than the theoretical stress concentration factor Kt. With the assumption of a plastic cyclic deformation ∊apW at the level of the fatigue limit the fatigue limit for a notched specimen can be calculated. According to formula (4) this fatigue limit σnaD is a function of Kt, ∊apW, the notch stress amplitude σa, the cyclic strengthening exponent n′ and the fatigue limit of a smooth specimen σW. Moreover, taking into account the statistical size effect with the known “weakest link concept”, see flow chart Fig. 9, the calculation is in a good agreement with 77 test results for steel.
    Notes: Wird eine plastische Wechselverformung im Kerbgrund auch in Höhe der Dauerfestigkeit angenommen, so kann mit Hilfe der Neuber-Formel und des zyklischen Spannungs-Dehnungs-Diagramms eine makroskopische Stützwirkung berechnet werden. Wird weiterhin der statistische Größeneinfluß nach dem Fehlstellenmodell berücksichtigt, so kann die Kerbwirkung bei Bauteilen mit ausreichender Genauigkeit abgeschätzt werden. Der Nachweis für die Treffsicherheit des Modells wird anhand von Versuchsergebnissen an Probestäben aus Stahl geführt.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19910220602
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  • 9
    Electronic Resource
    Electronic Resource
    Berechnung der Dauerschwingfestigkeit bei mehrachsiger Beanspruchung  -  Teil 3 (1993)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 24 (1993), S. 339-347 
    Details
    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
    Notes: Hinsichtlich der gegenwärtigen teilweise unübersichtlichen Situation auf dem Gebiet der Dauerfestigkeitsberechnung bei mehrachsiger Beanspruchung wurde in der vorliegenden Arbeit eine systematische Untersuchung mit dem Ziel, die vorhandenen Festigkeitshypothesen für metallische Werkstoffe objektiv zu bewerten und ein Rechenverfahren für die praktische Anwendung zu erarbeiten, durchgeführt.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19930240916
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  • 10
    Electronic Resource
    Electronic Resource
    poly(4,4′-oxybibenzoate): Polymerization, morphology, transitions, and crystal structures (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 1923-1940 
    Details
    ISSN: 0887-6266
    Keywords: poly(4,4′-oxybibenzoate) ; polymerization ; morphology ; transitions ; crystal structure ; disclination domains ; Iamellae ; single crystals ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 4-Acetoxy 4′-carboxy biphenyl has been polymerized from solution, the bulk melt, and in constrained thin films, all below the melting point of the monomer as measured by differential scanning calorimetry (DSC). An isothermal sublimation-recrystallization-melting (and chemical change)-polymerization-crystallization process is proposed. From solution and in the thin films, single crystals consisting of ca. 100 Å thick lamellae are observed, with evidence for monomer addition-reaction on the end (top and bottom) surfaces. The bulk samples are fibrous, the “fibers” consisting of whisker-like single crystals. The polymer is highly heat and radiation (electron beam) resistant, with numerous successive electron diffraction (ED) patterns from the same crystal or sheared sample permitting comparison of the changes in ED patterns with transitions seen by DSC at ca. 350, 530, and 590°C. Phase I (a = 7.8, b = 5.5, c = 10.8 Å), a possible phase II (a = 15.6, b = 3.6 Å c = unknown), and a phase III (a = 9.0, b = 5.2 = √3a, c = 10.8 Å). Phases I and II are seen in samples polymerized at temperatures at and below 310°C; phase III is observed in samples polymerized at and above 350°C and in sheared samples. © 1993 John Wiley & Sons, Inc.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090311305
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