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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied composite materials 1 (1994), S. v 
    ISSN: 1573-4897
    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
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  • 2
    ISSN: 1573-4897
    Keywords: Interlaminar shear strength ; Curved samples
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract To assess the bonding quality between the different layers of composite rings fabricated by filament winding it is necessary to choose a useful shear test. A method for measuring the shear strength of thin curved samples is proposed herein. Stress distribution within the probe is calculated and evaluated by finite element method.
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  • 3
    ISSN: 1573-4897
    Keywords: Tensile impact ; CALL ; CCVC interfacial layer ; Hybrid effect ; Strain rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this paper, the loading and loading-unloading tests of CALL and CALL (CCVC) under tensile impact have been carried out by a self-designed Rotating Circular Disk Tensile impact Apparatus. The quasi-static tension and short beam bending tests are performed on the Shimadzu-5000 testing apparatus. Experiment results show that both CALL and CALL (CCVC) have positive hybrid effect. Under quasi-static tension, the two composites have no obvious yielding until fracture, but have an obvious yielding point on the dynamic tensile stress-strain curves. The dynamic unstable fracture strain is about three times the static unstable fracture strain. The interlaminar shear strength (ISS) of CALL (CCVC) is 10 more than that of CALL. At the same time, the tensile strength and unstable fracture strain of CALL (CCVC) are also higher than that of CALL. In this paper, some conclusions are also drawn from the SEM observation of the fracture specimen surfaces.
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  • 4
    ISSN: 1573-4897
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Mainly, this paper deals with cylindrical laminated panels, axially compressed under the constraint of four simply-supported edges. By imposing uniform increasing end-shortening to the two opposite circular edges, characteristic equilibrium paths have been obtained in correspondence to numerical evaluations with finite element models subject to geometric non linearity. A peculiar link among different branches of the total path, each of which is connected to a proper deformed configuration, is pointed out in the axial load/end-shortening space. Convergence problems and mesh sensibility are also examined.
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  • 5
    ISSN: 1573-4897
    Keywords: Matrix composite ; Hard skeleton ; Structure of composite ; Strength of composite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A mathematical model of the formation and failure of a hard skeleton in sintered composites with a high content of high-melting filler is presented. On the basis of an analysis of joining particles in sintering the characteristics of the structure of composites (in particular, a connectivity and contiguity of skeleton) are determined. A mathematical model of skeleton failure which is based on the theories of percolation and reliability is developed. The influence of the characteristics of the composite structure on the strength of composite is studied.
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  • 6
    ISSN: 1573-4897
    Keywords: Composite ; Percolation ; Chemical vapor infiltration (CVI) ; Porosity ; Tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Three-dimensional x-ray microtomography has been used to visualize porosity in ceramic matrix composites during chemical vapor infiltration processing. The topology of percolating pores was determined in both 0°/90° and 0°/45° architectures. At densities greater than 75%, consolidation can be described with percolation theory.
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  • 7
    ISSN: 1573-4897
    Keywords: interface ; acoustic emission ; glass fibre ; epoxy ; unsaturated polyester ; tension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The aim of this paper is to propose a characterization method of the glass fibre/organic matrix interface based on acoustic emission. On the basis of tensile tests, it was possible to make a discrimination between the features which are not characteristic of the fibre/matrix interface (fracture properties and modulus) because taking into account some parameters other than the interface alone on one hand, and on the other hand certain characteristic features (strain and energy at first damage) which are defined on the basis of an analysis of the acoustic emission spectra of the material.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Applied composite materials 1 (1994), S. 135-153 
    ISSN: 1573-4897
    Keywords: Composite ; Thermoplastic ; Polyetherimide ; Stamp forming ; Manufacturing ; Woven fabric ; Glass fiber
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this investigation a mould with hemispherical cavity and 80 kN hydraulic press, allowing variable stamping speeds, are employed for experimentally studying of the 3-D stamp forming process of continuous fiber reinforced thermoplastic laminates. In particular, glass fiber (GF) reinforced polyetherimide (PEI) woven fabric made of sheath surrounded, polymer powder impregnated fiber bundles manufactured by Enichem, Italy, is used. Pre-consolidated laminates are heated by contact heating in an external heater up to about 120°C above the glass transition temperature (T g) of the polymer matrix; they are then stamp formed in a cold matched metal tool. Typical cycle times (including preheating time of the preconsolidated laminates) are in the range of 3 min. Useful processing conditions, such as stamping temperature, stamping velocity and hold-down pressure required for stamp forming of this composite are determined. In addition the effect of die geometries (deformation radian) and original laminate dimensions are studied. The results describe the correlations between processing parameters and fiber buckling. Finally the thickness distribution in stamped parts are investigated in relation to different directions of fiber orientation.
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  • 9
    ISSN: 1573-4897
    Keywords: Thermoelasticity ; PEEK ; Semicrystalline ; Glassy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A thermoelastic evaluation, based on simultaneous measurements of the mechanical work and of the concomitant heat of deformation by a stretching micro calorimeter, was performed on semicrystalline and glassy PEEK. The objective of this study was to utilize the sensitive technique to detect differences that would account for observed effects of micro structure on mechanical performance. A clear difference was detected beyond a 0.6% strain, where the behaviour of glassy PEEK began to exhibit inelastic features such as yielding and plastic deformation. This difference between the glassy and the semicrystalline polymers was considered the reason for the superior mechanical fatigue and fracture properties produced by the latter micro structure.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Applied composite materials 1 (1994), S. 177-181 
    ISSN: 1573-4897
    Keywords: Hybrid ; Ceramic Matrix Composites ; Tape casting ; Microcracking
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The desire to improve the transverse properties and microcracking stress of unidirectional continuous fiber reinforced ceramic matrix composites has led to development of the hybrid ceramic matrix composite (HCMC). This paper discusses the techniques we used in the fabrication of HCMC specimens used for mechanical characterization.
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