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  • 1
    Electronic Resource
    Electronic Resource
    Multifunctional polymer composites (1996)
    Springer
    Advanced performance materials 3 (1996), S. 279-293 
    Details
    ISSN: 1572-8765
    Keywords: composites ; multifunctional materials ; polymer matrices ; radar absorbing materials ; smart materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper reviews research within the Structural Materials Centre, DRA Farnborough into adding additional functionality to polymer composite materials in order to increase their usefulness in addition to the traditional role of structural materials. Demand for greater value for money and cost effectiveness has driven materials scientists and engineers to look at ways of adding value to these materials by getting them to perform functions other that those originally envisaged, that is carrying load, being rigid and not buckling. This might simply be by combining materials together as hybrids to save weight or cost or perhaps to improve toughness without compromising the original properties. Alternatively, totally unrelated performance might be sought, such as the ability to sense and locate damage, these materials having been termed smart materials. In this paper the behaviour of a number of polymer composite multifunctional materials is presented, with examples drawn mainly from work in the Structural Materials Centre at DRA Farnborough. The review covers smart materials and structures, materials designed to absorb electromagnetic radiation and materials optimised for energy absorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00136792
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The stiffness and strength of a polyamide thermoplastic reinforced with glass and carbon fibres (1978)
    Springer
    Journal of materials science 13 (1978), S. 377-390 
    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 It has been established that the optimum degree of mechanical property enhancement by fibre reinforcement of a typical thermoplastic material (polyamide 6.6) is achieved if comparatively long fibres are used, the fibre length required being determined by the properties of the interface between the fibre and the thermoplastic matrix. The extent of stiffness improvement at low strains is described by simple modifications to the law of mixtures to allow for fibre orientation and length. The strength enhancement is limited by an embrittlement effect which reduces the strain to fracture as the stiffness of the composite is improved. The cause of this effect has been identified as matrix crack formation at the ends of the reinforcing fibres. At strains of between 0.5% and 1.0%, according to fibre type, length andV f, cracks form at the tips of the longest fibres aligned in the straining direction. Subsequently as the strain is increased more cracks form progressively at the ends of shorter and/or more misaligned fibres. It has been shown that initially this cracking can be accommodated by load transfer to adjacent fibres which “bridge” the cracked region. Final failure occurs when the extent of cracking across the weakest section reaches a critical level when the surrounding fibres and matrix can no longer support the increasing load.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647783
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The effect of edge stresses on the failure of (0°, 45°, 90°) CFRP laminates (1984)
    Springer
    Journal of materials science 19 (1984), S. 167-182 
    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 Four (0°, 45°, 90°) CF RP laminates with different stacking sequences of plies were tested in tension, and the development of damage and failure processes was monitored by visual observation and acoustic emission. All four developed cracks across the 90° layers before final failure, the thicker 90° layers cracking at lower applied loads. Cracks also formed parallel to the plies at the edges of three of the four laminates and grew, with increasing load, towards the middle. A theoretical model was developed to calculate the normal stresses perpendicular to the plane of a laminate at its edges. Effects were included for the residual stresses caused by cooling from the moulding temperature and by moisture absorption by the epoxy resin. The theoretical predictions agreed well with the observed differences in longitudinal edge cracking and delamination tendency of the four laminates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553006
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The effect of edge stresses on the failure of (0°, 45°, 90°) CFRP laminates (1984)
    Springer
    Journal of materials science 19 (1984), S. 167-182 
    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 Four (0°, 45°, 90°) CF RP laminates with different stacking sequences of plies were tested in tension, and the development of damage and failure processes was monitored by visual observation and acoustic emission. All four developed cracks across the 90° layers before final failure, the thicker 90° layers cracking at lower applied loads. Cracks also formed parallel to the plies at the edges of three of the four laminates and grew, with increasing load, towards the middle. A theoretical model was developed to calculate the normal stresses perpendicular to the plane of a laminate at its edges. Effects were included for the residual stresses caused by cooling from the moulding temperature and by moisture absorption by the epoxy resin. The theoretical predictions agreed well with the observed differences in longitudinal edge cracking and delamination tendency of the four laminates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02403123
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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