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  • damage  (3)
  • Springer  (3)
  • American Society of Hematology
  • Blackwell Publishing Ltd
  • Oxford University Press
  • 2000-2004  (3)
Collection
Keywords
Publisher
  • Springer  (3)
  • American Society of Hematology
  • Blackwell Publishing Ltd
  • Oxford University Press
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Dynamic compression-shear response of brittle materials with specimen recovery (2000)
    Springer
    Experimental mechanics 40 (2000), S. 321-330 
    Details
    ISSN: 1741-2765
    Keywords: Fragmentation ; damage ; ceramics ; impact ; wave propagation ; nanocomposites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A new configuration for compression-shear soft-recovery experiments is presented. This technique is used to investigate various failure mechanisms during dynamic multiaxial loading of an Al2O3/SiC nanocomposite and TiB2. Velocity profiles of the target surface are measured with a variable sensitivity displacement interferometer, yielding normal and transverse velocity-time histories. A dynamic shear stress of approximately 280 MPa is obtained, in the Al2O3/SiC nanocomposite, for an imposed axial stress of about 3.45 GPa on a 540 μm thick sample. This dynamic shear stress is well below the value predicted by elastic wave propagation theory. This could be the result of stress-induced damage and inelasticity in the bulk of the sample or inelasticity on the sample surface due to frictional sliding. To gain further insight into the possible failure mechanisms, an investigation of compression-shear recovery techniques, with simultaneous trapping of longitudinal and lateral release waves, is conducted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02327506
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  • 2
    Electronic Resource
    Electronic Resource
    Creep Failure Analysis of Bars Sustaining Constant Tensile Loads (2000)
    Springer
    Mechanics of time-dependent materials 4 (2000), S. 57-79 
    Details
    ISSN: 1573-2738
    Keywords: creep ; damage ; fracture ; life time ; viscoplasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Life time and failure modes are predicted for metallic barssustaining tensile creep. Experimental results show that a ductile or a`brittle' mode of fracture occurs depending respectively on whether thenominal applied stress is large or small. The analysis is based on amodeling of void nucleation and growth in which damage evolution iscontrolled by two mechanisms of plastic flow in the matrix material.Fracture is supposed to occur when the porosity attains a critical valuewhich depends on the mode of fracture considered. Experimental resultsare explained and described in terms of the proposed model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009875505588
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  • 3
    Electronic Resource
    Electronic Resource
    Prediction of the Residual Structural Integrity of a Polymer Matrix Composite Construction Element (2000)
    Springer
    Mechanics of time-dependent materials 4 (2000), S. 155-167 
    Details
    ISSN: 1573-2738
    Keywords: damage ; durability ; influence of environmental conditions ; laminates ; reliability ; unidirectional lamina ; viscoelasticity ; viscoplasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Polymers are time-dependent materials. Polymer matrix compositesbehave as viscoelastic-viscoplastic anisotropic continua. Theirthermomechanical characteristics are not only time-dependent, but arestrongly influenced by the variations of the environmental conditions(temperature, moisture diffusion, radiation, etc.). This concerns notonly the stiffness but also the strength characteristics, related to thedamage development. Due to the composite nature, the number of potentialdamage sources is high and the damage development has to take intoaccount all the interactions between simple mechanical loading modes,with or without, changing environmental conditions. Following anon-linear viscoelastic-viscoplastic analysis, based on the Schaperyequations and a Zapas–Crissman functional, the stiffness degradation isobtained based on short-term creep and creep-recovery measurements atdifferent stress levels and different temperatures. A damagecomponent is added to the viscoelastic-viscoplastic model in order toaccount for damage development and associated strength degradation.Results obtained in the transverse direction of an unidirectionalgraphite-epoxy composite are presented. The extension to completelaminates with different stacking sequences is discussed. An assumptionon the interlaminar behaviour must be introduced in order to take intoaccount the important damage source not considered in classical laminatetheories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009829926708
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