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  • 1990-1994  (8)
  • 1925-1929
  • 1991  (8)
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Material
Years
  • 1990-1994  (8)
  • 1925-1929
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    An optimization approach for material-constant determination for the endochronic constitutive model (1991)
    Springer
    Computational mechanics 8 (1991), S. 25-41 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An optimization approach for material-constant determination is developed and demonstrated for the endochronic constitutive model in this study. This model is rearranged so that it describes the plastic, viscoplastic and viscoelastic behavior in one simple form. Material constants for 304 stainless steel, alpha-titanium and viscoelastic elastomer Wingfoot@ are determined using this approach. Reduction of the general constitutive model and detailed formulation of the optimization problem for each specific case are given. Accurate optimization results giving good description of the material behavior are obtained. Superiority of the optimization approach over the trial-and-error method is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00370546
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Determination of fibre/matrix interfacial shear strength by an acoustic emission technique (1991)
    Springer
    Journal of materials science 26 (1991), S. 6631-6638 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The application of acoustic emission (AE) measurements to locate the sources of fracture of a single high-strength fibre embedded in an epoxy matrix which is loaded in tension is described. From the micromechanical model and the fragment length distribution, interfacial shear strength values were calculated. The technique is demonstrated for small-diameter glass and graphite fibres as well as for fibres which exhibit fibrillar fracture, such as Kevlar and PBZT. Good agreement is found between the mean fragment length values obtained by optical and AE measurements for glass and graphite fibres. Values obtained for interfacial shear strength by the AE technique are comparable with those obtained using other techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02402656
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of temperature and strain rate on tensile mechanical properties of ARALL-1 laminates (1991)
    Springer
    Journal of materials science 26 (1991), S. 3721-3729 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The combined effect of temperature and strain rate of the mechanical properties for unidirectional 3/2 ARALL®-1 laminates was studied. In this paper, the effect of strain rates from 0.00083–0.833 min−1 on tensile behaviour at temperatures up to 250°F (∼121 °C) has been conducted. It is demonstrated that tensile strength, tensile modulus, and fracture strain are found to depend on temperature and strain rate. However, the effect of strain rates at 75 °F (∼24 °C) and 180 °F (∼82 °C) was found to be insignificant except the lowest strain rate at 180 °F. It was also observed that the tensile yield strength decreased as the strain rate decreased. The tensile properties were moderately reduced at high temperatures and were higher at high strain rates than at low strain rates. The temperature effect is more significant than that due to the strain rate. Scanning electron photomicrographs of the fracture surfaces observed in the aramid/epoxy layer of ARALL-1 laminates at the lowest strain rate are shown to be significantly different only at 250 °F (∼121 °C). But this phenomenon is not obvious when the highest strain rate is employed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01184962
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of fibre/matrix interfacial shear strength by an acoustic emission technique (1991)
    Springer
    Journal of materials science 26 (1991), S. 6631-6638 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The application of acoustic emission (AE) measurements to locate the sources of fracture of a single high-strength fibre embedded in an epoxy matrix which is loaded in tension is described. From the micromechanical model and the fragment length distribution, interfacial shear strength values were calculated. The technique is demonstrated for small-diameter glass and graphite fibres as well as for fibres which exhibit fibrillar fracture, such as Kevlar and PBZT. Good agreement is found between the mean fragment length values obtained by optical and AE measurements for glass and graphite fibres. Values obtained for interfacial shear strength by the AE technique are comparable with those obtained using other techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553688
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    A finite-element model of the use of the microbond test method for characterization of composite interfacial properties (1991)
    Springer
    Journal of materials science 10 (1991), S. 1072-1075 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00720128
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Mechanical characterization of single-crystal α=Al2O3 fibres grown by the laser-heated pedestal technique (1991)
    Springer
    Journal of materials science 10 (1991), S. 1428-1429 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724397
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    An analytical approach of the microbond test method used in characterizing the fibre-matrix interface (1991)
    Springer
    Journal of materials science 10 (1991), S. 260-262 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00735651
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of surfactant treatments on interfacial adhesion in single graphite/epoxy composites (1991)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 12 (1991), S. 281-288 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Interfacial adhesion between graphite fibers and epoxy matrices is one of the important parameters in controlling composite performance. Experiments were performed to verify the idea that polymerizable and nonpolymerizable nonionic surfactants can promote wetting and increase interfacial shear strength. Using a single-fiber-composite (SFC) technique with a Poisson/Weibull model of fiber strength and flaws, the effective interfacial shear strength (ISS) was determined. The effect of surfactant treatments on interfacial adhesion in single graphite/epoxy composites was also compared with the effects of treatment with deionized water, absolute alcohol, and acetone. The experimental results showed that the fibers treated with the nonpolymerizable surfactant gained 37% in interfacial shear strength relative to those untreated or those treated with deionized water, absolute alcohol, or acetone. The polymerizable surfactants showed a 10% increase in interfacial shear strength. The lognormal distribution provided the best fit for critical aspect ratios obtained from the SFC tests.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750120409
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    Paper (German National Licenses)
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