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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of viscoelastic structural elements in the frequency domain (1989)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 27 (1989), S. 429-436 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The paper presents a formulation in the frequency domain for the viscoelastic material behaviour of structural elements. This approach is equally valid for deterministic forces, but also in the case of probabilistic descriptions of those forces. The method takes advantage of readily available experimental data and shows how to introduce them in e.g. finite element formulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620270213
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    Paper (German National Licenses)
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  • 2
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    Viscoelastic modelling of epoxy-resins for adhesive and composite applications (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Nonlinear viscoelastic and thermoelastic characterization procedures were applied to a rubber toughened adhesive that is commercially available as FM-300. Long time (accelerated testing) predictions on the basis of stress-time-superposition and time-temperature-superposition were compared with actual long term data. Good verification was obtained.
    Keywords: NONMETALLIC MATERIALS
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The nonlinear viscoelastic response of resin matrix composite laminates (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Possible treatments of the nonlinear viscoelastic behavior of materials are reviewed. A thermodynamic based approach, developed by Schapery, is discussed and used to interpret the nonlinear viscoelastic response of a graphite epoxy laminate, T300/934. Test data to verify the analysis for Fiberite 934 neat resin as well as transverse and shear properties of the unidirectional T300/934 composited are presented. Long time creep characteristics as a function of stress level and temperature are generated. Favorable comparisons between the traditional, graphical, and the current analytical approaches are shown. A free energy based rupture criterion is proposed as a way to estimate the life that remains in a structure at any time.
    Keywords: COMPOSITE MATERIALS
    Type: NASA-CR-3772 , NAS 1.26:3772 , VPI-E-83-6
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    The nonlinear viscoelastic response of resin matrix composites (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The current paper describes the utilization of a thermodynamic based analytical nonlinear viscoelastic approach to represent lamina properties. Test data to verify the analysis for both transverse and shear properties of a T300/934 composite are presented. Master curves as a function of stress level and temperature are generated. Favorable comparisons between the traditional graphical and the current analytical approaches are shown.
    Keywords: COMPOSITE MATERIALS
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A non-linear viscoelastic characterisation method for matrix resin composites (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Lifetime prediction of matrix resin composites is an important problem because of their viscoelastic character. If the Time-Temperature-Stress-Superposition principle is valid, results from short time tests at high stress levels can give the necessary information for the prediction of long time behavior. At such stress levels the viscoelastic response is nonlinear. In this contribution the basis of a computer routine is presented starting from a thermodynamical formulation given by Schapery. This method gives in an accurate way the different material parameters in that nonlinear constitutive equation for different stresses and temperatures.
    Keywords: STRUCTURAL MECHANICS
    Type: High performance composite materials: New applications and industrial production; Oct 17, 1983 - Oct 20, 1983; Bordeaux; France
    Format: text
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    NASA TECHNICAL REPORTS
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