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  • 1
    Electronic Resource
    Electronic Resource
    On matrix cracking in fiber reinforced ceramics
    Amsterdam : Elsevier
    Journal of the Mechanics and Physics of Solids 41 (1993), S. 1137-1154 
    Details
    ISSN: 0022-5096
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-5096(93)90087-V
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of deformation and contraction in cylindrical crystals due to dispirations or dislocations
    Amsterdam : Elsevier
    Journal of Theoretical Biology 78 (1979), S. 129-142 
    Details
    ISSN: 0022-5193
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-5193(79)90331-X
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  • 3
    Electronic Resource
    Electronic Resource
    Fatigue behaviour of aligned short carbon-fibre reinforced polyimide and polyethersulphone composites (1985)
    Springer
    Journal of materials science 20 (1985), S. 3353-3364 
    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 Fibre reinforced plastics, with 50 to 55 vol % of aligned short carbon fibres of approximately 3 mm in length, have good mechanical properties and advantages in deformability during the manufacturing process of structural components. The mechanical properties and damage mechanisms of this kind of composite have not been investigated deeply in the past. In the present paper results of an examination programme on laminates with various stacking sequences and two thermoplastic matrix systems (polyimide and polyethersulphone) are given. It will be shown that composites reinforced with aligned discontinuous carbon fibres can be an alternative material to continuous-fibre reinforced composites when considering their static and fatigue properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00545205
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  • 4
    Electronic Resource
    Electronic Resource
    Silicon carbide (NicalonTM) fibre-reinforced borosilicate glass composites: mechanical properties (1997)
    Springer
    Journal of materials science 32 (1997), S. 6459-6469 
    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 objective of this study was to assess the applicability of an extrinsic carbon coating to tailor the interface in a unidirectional NicalonTM–borosilicate glass composite for maximum strength. Three unidirectional NicalonTM fibre-reinforced borosilicate glass composites were fabricated with different interfaces by using (1) uncoated (2) 25 nm thick carbon-coated and (3) 140 nm thick carbon coated Nicalon fibres. The tensile behaviours of the three systems differed significantly. Damage developments during tensile loading were recorded by a replica technique. Fibre–matrix interfacial frictional stresses were measured. A shear lag model was used to quantitatively relate the interfacial properties, damage and elastic modulus. Tensile specimen design was varied to obtain desirable failure mode. Tensile strengths of NicalonTM fibres in all three types of composites were measured by the fracture mirror method. Weibull analysis of the fibre strength data was performed. Fibre strength data obtained from the fracture mirror method were compared with strength data obtained by single fibre tensile testing of as-received fibres and fibres extracted from the composites. The fibre strength data were used in various composite strength models to predict strengths. Nicalon–borosilicate glass composites with ultimate tensile strength values as high as 585 MPa were produced using extrinsic carbon coatings on the fibres. Fibre strength measurements indicated fibre strength degradation during processing. Fracture mirror analysis gave higher fibre strengths than extracted single fibre tensile testing for all three types of composites. The fibre bundle model gave reasonable composite ultimate tensile strength predictions using fracture mirror based fibre strength data. Characterization and analysis suggest that the full reinforcing potential of the fibres was not realized and the composite strength can be further increased by optimizing the fibre coating thickness and processing parameters. The use of microcrack density measurements, indentation–frictional stress measurements and shear lag modelling have been demonstrated for assessing whether the full reinforcing and toughening potential of the fibres has been realized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018642723310
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  • 5
    Electronic Resource
    Electronic Resource
    Local elastodynamic stresses in the unit cell of a woven fabric composite (2000)
    Springer
    Archive of applied mechanics 70 (2000), S. 423-442 
    Details
    ISSN: 1432-0681
    Keywords: Key words Impact behavior ; stress waves ; stress concentrations ; woven fabric composites ; integral transforms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary A theoretical study of the local elastodynamic stresses of woven fabric composites under dynamic loadings is presented in this article. The analysis focuses on the unit cell of an orthogonal woven fabric composite, which is composed of two sets of mutually orthogonal yarns of either the same fiber (nonhybrid fabric) or different fibers (hybrid fabric) in a matrix material. Using the mosaic model for simplifying woven fabric composites and a shear lag approach to account for the inter-yarn deformation, a one-dimensional analysis has been developed to predict the local elastodynamic and elastostatic behavior. The initial and boundary value problems are formulated and then solved using Laplace transforms. Closed form solutions of the dynamic displacements and stresses in each yarn and the bond shearing stresses at the interfaces between adjacent yarns are obtained in the time domain for any type of in-plane impact loadings. When time tends to infinity, the dynamic solutions approach to their corresponding static solutions, which are also developed in this article. Solutions of certain special cases are identical to those reported in the literature. Lastly, the dynamic stresses and bond shearing stresses of plain weave composites subjected to step uniform impacts are presented and discussed as an example of the general analytical model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004199900076
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  • 6
    Electronic Resource
    Electronic Resource
    Damage characterization of two-dimensional woven and three-dimensional braided SiC-SiC composites (1996)
    Springer
    Journal of materials science 31 (1996), S. 232-241 
    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 A comprehensive investigation of the room temperature behaviour of two-dimensional woven and three-dimensional braided SiC-SiC composites fabricated by the chemical vapour infiltration route has been conducted. A morphological study of the residual porosity in the composites revealed the existence of primarily two populations of pores: small intrayarn pores and larger interyarn pores. The sizes and the shapes of the two types of pores depended largely on the fibre architecture; the two step braided composite in which the majority of the fibre yarns were orientated along the axial direction exhibited the smallest pore size. The pore size and shapes in turn influenced the onset of damage in the composites under tensile loading. Damage was found to be initially matrix dominated, thus being essentially independent of the fibre architecture. At higher stress levels, however, fibre dominated damage prevailed. Unlike the tensile behaviour, where damage led to non-linearity in the stress-strain curve, the compressive behaviour of the composites was linear elastic almost up to failure. The off-axis tensile properties as well as compression after tension behaviour of the two-dimensional woven composites were also investigated. The information obtained from these tests provides the basis for the modelling of damage in these materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00355150
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal shock resistance of laminated ceramic matrix composites (1991)
    Springer
    Journal of materials science 26 (1991), S. 2961-2966 
    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 thermal shock resistance capability of laminated ceramic matrix composites is investigated through the study of three-dimensional transient thermal stresses and laminate failure mechanisms. A (−45°/45°)s SiC/borosilicate glass laminate is utilized as a reference composite system to demonstrate the analytical results. The maximum allowable temperature change, ΔT max, has been taken as a measure of the thermal shock resistance capability of composites. The effects of fibre orientation, volume fraction, thermal expansion coefficient. Young's modulus, and thermal conductivity on the thermal shock resistance capability, expressed in terms of the maximum allowable temperature change, ΔT max, have been assessed. Numerical computations are also performed for six composite systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01124828
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  • 8
    Electronic Resource
    Electronic Resource
    Process simulation and fabrication of advanced multi-step three-dimensional braided preforms (1994)
    Springer
    Journal of materials science 29 (1994), S. 2159-2167 
    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 fundamentals of “multi-step” braiding for the fabrication of three-dimensional fibre preforms for composites have been studied. To facilitate the understanding of the complex multi-step braiding processes, a computer simulation algorithm has been developed. The simulation acts as a tool to allow the identification of individual yarn paths, number and location of yarn groups, and braid geometry. It was found that individual control of the rows and columns of yarn carriers on a Cartesian braiding bed allows for the fabrication of advanced “multi-step” braids; the micro-structural possibilities of three-dimensional braids are thus greatly extended. Some basic relationships of the braiding parameters have been identified. It has been concluded that the traditional four-step and two-step braidings are special cases of multi-step braidings. To verify the feasibility of the structures, experimental investigations have also been carried out. Innovative braid architectures have been designed and fabricated using a prototype multi-step braiding machine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01154695
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  • 9
    Electronic Resource
    Electronic Resource
    Elastic-plastic analysis of indentation damage: cyclic loading of copper (1987)
    Springer
    Journal of materials science 22 (1987), S. 3087-3094 
    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 This is the second in a two-paper series examining the elastic-plastic deformation of a metallic target material under repeated impact. This paper examines the effect of statically cyclic loading on copper and numerical calculations have been performed up to ten cycles. The extent of the loading phase in each cycle is specified by a constant external work done by the indenter. The deformed configuration of the target material, the locus of material flow, and elastic-plastic boundaries due to cyclic loading are presented. There is a saturation of the stress field near the bottom of the indented crater after the first few cycles of loading. A residual tensile stress field in the direction normal to the target surface exists underneath the indenter in every cycle, which is responsible for the formation of subsurface layer cracks. Results of the coefficient of restitution obtained from the analysis and experiments are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161168
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  • 10
    Electronic Resource
    Electronic Resource
    Surface layer hardening of polycrystalline copper by multiple impact (1980)
    Springer
    Journal of materials science 15 (1980), S. 2331-2334 
    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 A near-rigid indenter is used to impact repeatedly a fixed location on a target material. The process of work-hardening in copper targets was revealed by the change of the value of the coefficient of restitution during a sequence of impacts. It was found that for a series of impacts on a single point the ratio of the rebound energy to the impact energy approaches a constant value which is independent of the impact energy and appears to be related to the dislocation density. Repeated impacts on a fixed location result in (1) plastic deformation decreasing with successive impacts because of work-hardening, (2) increasing volume of work-hardening material that contributes to the elastic rebound, and (3) bowing of dislocations. The process is similar to cyclic hardening associated with fatigue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00552325
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