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  • 1
    ISSN: 1573-4897
    Keywords: Composites ; Nondestructive testing ; Ultrasonics ; LDF™ ; Fatigue ; Thermography ; Specimen type ; Thermoforming ; Image processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Specimens made of Long Discontinuous Fiber (LDF™) composite material were elongated to different states of deformation by thermoforming. Tension-tension-fatigue tests were performed using waisted bidirectional specimens cut out of the thermoformed parts. These resulted in similar shapes of the Wöhler-curves fairly independently of the deformation state of the LDF™-material. In addition, the static strength values were not very much influenced by the elongation of the specimens. The specimens were nondestructively inspected by ultrasonics and thermography.
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  • 2
    ISSN: 1573-4897
    Keywords: Composite ; Polyethylene Fibre ; Epoxy ; Strain rate ; Temperature ; Impact ; Work of fracture ; Viscoelasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence of strain rate and temperature on modulus, strength and work of fracture of high-performance polyethylene (HP-PE) fibres and composites is investigated. Results showed that an increase in strain rate and/or decrease in temperature leads to a reduction in work of fracture. At high strain rates or low temperatures a constant minimum level for the fracture energy is reached. The energy absorption capacity of HP-PE/epoxy laminates is investigated using full penetrating dart-impact tests and showed similar trends than observed for HP-PE fibres. The impact energy of these laminates could be described quantitatively in terms of fibre, matrix and delamination effects by combining the tensile test results on fibres and unidirectional composites with fracture toughness experiments on laminates.
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  • 3
    ISSN: 1573-4897
    Keywords: Flexural fatigue ; Glass reinforced composites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions Flexural fatigue of uniaxially and biaxially stressed IPN/glass mat composites was investigated using four point bend (4PB) and concentrically loaded (CL) specimen geometries. Regions of nearly constant bending moment between the inner spans of a 4PB beam and within the inner annulus of a CL circular plate yield quasi-uniform uniaxial and biaxial stress, respectively, on the tensile faces. The specimen dimensions were optimized for both loading geometries to give: (1) reduced specimen deflection through maximizing the ratio of the induced tensile stresses to the applied load, (2) minimized contact stresses by maximizing the induced stress with respect to the unit contact load, and (3) a large material volume exposed to the maximum cyclic stress (i.e., statistical fracture initiation). A power model was used to analyze the fatigue data for the 4PB and CL specimens. Both IPN composite materials studied fatigued more rapidly under the more severe loading conditions imposed by the CL specimen geometry. Fractography revealed that debond fracture was the dominant damage process for both geometries. The initial debond cracks were uniformly distributed throughout the stressed regions, confirming the presence of nearly uniform tensile stress. Damage localization followed after further cycling and was characterized by a locally high debond fracture density, fiber fracture, and always occurred where several glass strands crossed near the specimen surface. Final specimen failure resulted from the preferential growth of dominant cracks through the specimen thickness.
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  • 4
    ISSN: 1573-4897
    Keywords: Micromechanics ; Composite materials ; Fatigue
    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 concentric cylinders model is used to predict the fatigue characteristics of off-axis unidirectional laminates. A failure criterion that uses stresses averaged along the radial distance in each constituent phase is applied to predict the S-N curves of unidirectional laminates. The predicted S-N curves compare well with the experimental data for various off-axis Glass/Epoxy laminates.
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  • 5
    ISSN: 1573-4897
    Keywords: Composite materials ; Micromechanics ; Concentric cylinders model
    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 a micromechanics model using the concentric cylinder assemblage model and the Mori-Tanaka average stress scheme is used to predict the static strength of unidirectional angle ply laminates. The predicted strengths agree with experimental results for Glass/Epoxy and Graphite/Epoxy systems.
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  • 6
    ISSN: 1573-4897
    Keywords: Failure index ; Quadratic failure criteria ; Maximum strength ; Optimal stacking sequence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The quadratic failure criterion, which is intended to predict fracture, may be used as an object function for optimal stacking sequence design of laminated plate. However, calculations using a symmetric laminated plate demonstrate that Tsai-Wu theory may give incorrect optimum predictions under uniaxial loading.
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  • 7
    ISSN: 1573-4897
    Keywords: Metal matrix composites ; Fracture toughness ; Fracture mechanism ; Elevated temperature ; Author! Please supply
    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 temperature on the fracture behaviour of a peak-aged alumina particulate 6061 aluminium composite was studied in the range of 25 to 180° C. The fracture toughness was found to be independent of test temperature. The role of the reinforcement phase was examined in detail at 180° C, and compared to observations at room temperature, by using an interrupted test methodology. Ductile fracture occurred at all temperatures. At room temperature the fractured particles acted as void nucleation sites and at 180° C both debonded and fractured particles were responsible for void nucleation. Large particles were found to be susceptible to fracture and nucleate microvoids earlier than small particles. A decrease in the range and size of the reinforcement phase would increase the fracture resistance for this MMC material.
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  • 8
    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 This paper deals with the creep effect on dynamic visco-elastic properties of short fibre reinforced polymer SMC composite. The vibration-creep-vibration test procedure was applied to examine the influence of creep on dynamic modulus E and loss tangent tgδ of the material. The results show that creep causes appreciable influence on E and tgδ.
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  • 9
    ISSN: 1573-4897
    Keywords: Particle-filled material ; Finite-element method (FEM) ; Damage mechanism
    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 stress distribution around the spherical particle in polymeric based composite materials was analyzed using axisymmetric finite-element method. The effect of varying Young's modulus and volume fraction of second-phase particle was examined. Predicted values of the modulus of particle-filled composite were given as function of the volume fraction of filler. Based upon these calculated results, various damage mechanisms relevant to the stress conditions in loaded materials were discussed. It is shown that the numerical predictions are in qualitative agreement with the microscopical observations.
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  • 10
    ISSN: 1573-4897
    Keywords: Composites ; Silicon carbide ; Wetting ; Reactivity ; Chemical oxidation
    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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