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  • Articles  (9)
  • damage  (9)
  • 2020-2024
  • 2000-2004  (9)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (9)
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  • Articles  (9)
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  • 1
    Electronic Resource
    Electronic Resource
    Mixed mode fracture in plain and reinforced concrete: some results on benchmark tests (2000)
    Springer
    International journal of fracture 103 (2000), S. 127-148 
    Details
    ISSN: 1573-2673
    Keywords: Mixed-mode fracture ; shear ; dowel-action ; notched specimens ; path-dependence ; smeared cracks ; (non)local models ; damage ; plasticity.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Three different models for concrete based on local and non-local approaches have been adopted to investigate the mechanical behaviour of plain and reinforced concrete when undergoing mixed-mode fracture. The purpose of the research is to understand the results of some benchmark tests, to compare the models with each other and with experiments, and to estimate the reliability of the modelling. To create a sound basis for the comparison, the discretizations, the boundary conditions and the material data are considered, when possible, as unified parameters for the different models in each benchmark test.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007613001402
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  • 2
    Electronic Resource
    Electronic Resource
    Numerical investigation of low cycle fatigue of aluminium reinforced by SiC–fibres (2000)
    Springer
    International journal of fracture 104 (2000), S. 257-271 
    Details
    ISSN: 1573-2673
    Keywords: Viscoplasticity ; damage ; fibre–reinforced materials ; aluminium ; metal matrix composites.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Due to complexity the analysis of low cycle fatigue behaviour of long fibre reinforced metal matrix composites needs to take into consideration viscoplastic deformation and damage of the matrix, damage deactivation processes and manufacture residual stresses. Therefore, a comprehensive material model especially feasible for the description of cyclic material behaviour is presented for the metallic matrix. This model not only takes into account damage treated by means of the continuum damage mechanics. In addition, a final failure criterion allows the consideration of the crack path in the matrix of the composite. As multidirectional laminates show a much more complex damaging behaviour than unidirectional composites do, a bi-directional fibre arrangement is investigated. Therefore a three-dimensional finite element analysis is necessary to examine such types of composites. Premising the presented material model not only the development of continuous damage in the composite can be computed for various external loadings. Cracks following the continuous damage process grow parallel and circumferentially to the fibre in the off–axis layer. Therefore, it can be stated that the fatigue behaviour is strongly influenced by plies perpendicularly loaded. The damage and crack process shows also strong effects on the macroscopic mechanical behaviour of the composite such as a decrease of the absolute values of maximum and minimum stresses and a loss of unloading modulus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007645700312
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  • 3
    Electronic Resource
    Electronic Resource
    Continuum versus discontinuum damage mechanics of creep caused by microcracking (2000)
    Springer
    International journal of fracture 101 (2000), S. 181-201 
    Details
    ISSN: 1573-2673
    Keywords: Creep ; damage ; brittle materials ; fracture kinetics ; microcrack ; thermal activation.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effect of evolution of damage, mainly microcrack damage, on creep and creep fracture of brittle materials (or materials exhibiting brittle-like behavior under certain temperature and loading conditions) is treated theoretically. A comparative analysis of two basic approaches is given: (i) continuum damage mechanics (CDM), and (ii) discontinuum damage mechanics (DDM). The first approach deals, from the very beginning, with continuum abstract description of damage with the help of field quantities. The second approach considers the macroscopic mechanical behavior of the material affected by damage evolution in terms of individual damage units, such as microcracks or/and microvoids. A serious conceptual deficiency of the CDM approach is pointed out and analyzed. This deficiency is associated with the CDM basic notion of the effective stress, understood as the stress (referred to undamaged area) which governs the deformation of the material per se in the presence of damage. This deficiency becomes apparent in the case when damage is caused by a multitude of cracks (microcracks). In this case, the damaged area, as it is defined by CDM, is actually the area occupied by cracks. As this area is negligible, the effect of damage on the mechanical behavior of the material, according to CDM, would be negligible either, irrespective of the cracks concentration, which is in deep contradiction with reality. It is shown how the situation can be improved with the aid of DDM and how the macroscopic creep behavior relates to the structure and strength parameters of the material when considering the mechanism of damage evolution in terms of thermal activation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007677529834
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  • 4
    Electronic Resource
    Electronic Resource
    Strength, Durability, and Safety of Engineering Systems (2000)
    Springer
    Strength of materials 32 (2000), S. 409-416 
    Details
    ISSN: 1573-9325
    Keywords: strength ; life ; engineering safety ; stress ; strain ; damage ; fatigue ; creep ; fracture mechanics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The evolution of approaches to the solution of machine dynamics and strength problems on the basis of determining static and dynamic nominal and local stresses of the operating load is discussed. It is shown how the material strength and plasticity characteristics, the cyclic strength characteristics in the high-cycle and low-cycle fatigue regions, the high-temperature long-term strength and creep characteristics, and the linear and nonlinear characteristics of fracture mechanics were sequentially used as the basic criterial parameters of the deformability and strength of structural materials. Particular emphasis was given to the results of studies on machine safety and catastrophe mechanics. Integrated approaches to the solution of strength and safety problems of potentially dangerous facilities (nuclear power stations, spacecraft complexes, aircraft, chemical plants, etc.) by analysis of all stages of their life cycle, including design, manufacture, testing, and operation, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005212213718
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  • 5
    Electronic Resource
    Electronic Resource
    Shear beam model for interface failure under antiplane shear (I)—Fundamental behavior (2000)
    Springer
    Applied mathematics and mechanics 21 (2000), S. 1221-1228 
    Details
    ISSN: 1573-2754
    Keywords: interface layer ; cohesive layer ; anti-plane shear ; shear beam model ; failure ; instability ; damage ; 0342
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract The propagation of interlayer cracks and the resulting failure of the interface is a typical mode occurring in rock engineering and masonry structure. On the basis of the theory of elastoplasticity and fracture mechanics, the shear beam model for the solution of interface failure was presented. The concent of ‘cohesive crack’ was adopted to describe the constitutive behavior of the cohesive interfacial layer. Related fundamental equations such as equilibrium equation, constitutive equations were presented. The behavior of a double shear beam bonded through cohesive layer was analytically calculated. The stable propagation of interface crack and process zone was investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459242
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  • 6
    Electronic Resource
    Electronic Resource
    Shear beam model for interface failure under antiplane shear (II)— Instability (2000)
    Springer
    Applied mathematics and mechanics 21 (2000), S. 1229-1236 
    Details
    ISSN: 1573-2754
    Keywords: interface layer ; antiplane shear ; failure ; shear beam model ; instability ; snapthrough ; snap-back ; damage ; 0342
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract Based on the (I) of the present work, the behavior of shear beam model at crack initiation stage andat instable propagation stage was studied. The prime results include:1) discriminant equation which clarifies the mode of instability, snap-back or snap-through, was established;2) analytical solution was given out for the double shear beam and the load-displacement diagram for monotonic loading was presented for a full process; and3) the problem of the energy release induced by instability was discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459243
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  • 7
    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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  • 8
    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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  • 9
    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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