Papers studies on Particle Reinforced Composite

1- Fracture behaviour of fly-ash filled FRP composites - Elsevier

Abstract : The major objective of this study was to determine the fracture toughness and fracture surface energy of epoxy, epoxy/fly-ash, epoxy/carbon fibre, epoxy/carbon fibre/fly-ash, epoxy/glass fibre and epoxy/glass fibre/fly-ash composites. The quality of composite specimens was evaluated by the ultrasonic method. The results show that a fly-ash particle can arrest the crack path and thus improve the fracture properties of fibre reinforced plastic (FRP) composites. The results of this study have further significance in view of the fact that fly-ash powder is far cheaper than carbon fibre, glass fibre and epoxy resin.

2- Particle reinforced metals of high ceramic content- Elsevier

Abstract: It is commonly considered that, in ceramic particle reinforced metals, the volume fraction of ceramic should not exceed 30% if the composite is intended for structural applications: otherwise its toughness and ductility generally become unacceptably low. Particle reinforced metal matrix composites produced by infiltration provide a material with which this assumption can be tested. We first present a summary of recent results from our laboratory showing that aluminium matrix composites containing 50% or more ceramic particles can be tough, strong and relatively ductile, despite the high ceramic loadings. We then discuss toughening mechanisms that can explain the mechanical properties displayed by these composites, to highlight the importance of the particle strength distribution on the composite fracture toughness.

3- Analysis of the interface between a thermoplastic fiber and a thermosetting matrix using photoelasticity - Elsevier.

Abstract: The photoelastic images of the isochromatic fringes for a pull-out specimen were used to measure and to analyze the maximum interfacial shear strength for a thermoplastic–thermoset interface (PET/Epoxy). The photoelastic technique allows the loading process to be followed in-situ, as well as the determination of the shear stress distribution on a tested sample. A description of the stress transfer process and the measurement of the shear stress level along the embedded fiber were done. The maximum shear strength was located along the fiber surface at a distance of 2.5 times the diameter from the specimen border. The maximum shear stress values obtained from the photoelastic analysis were corrected to include the tri-dimensional axisymmetric distribution of the shear stress around the fiber. The corrected shear stress measured τcMax ranged from 0.27 to 1.17 MPa.

4- Cohesive Zone Modelling of Crack Growth in Particle Reinforced Metal Matrix Composites - ICF11

Abstract: Metal matrix composites have been produced by gas pressure infiltration of ceramic particle beds with pure aluminium. Two different types of alumina particles have been employed: 35 μm angular and 15 μm polygonal particles. The resulting composites feature a homogeneous microstructure that is free of processing defects. Crack growth in these materials was characterized via single specimen J-integral testing according to ASTM E-1737. Both types of material exhibit stable crack growth and marked R-curve behaviour. Stereophotogrammetric measurements were used in order to infer the amount of energy dissipated in the process zone, by particle cracking or and matrix voiding. In the process zone and for both types of damage, the main dissipative mechanism is via the stretching of metal ligaments. Crack growth is modelled in CT specimens with a cohesive model, with parameters fitted from experimental load vs. CMOD records. Computed J–!a curves exhibit somewhat stronger crack growth as compared to experimental ones. We attribute this offset mainly to the limited sample dimensions, and to the difficulty of representing a 3-D sample with a 2-D plane strain analysis. On the other hand, the agreement is sufficiently good to confirm the metallic character of the examined half-ceramic metal matrix composites, in so far as their toughness is dominated by remote plasticity. The amplification factor in our analysis is about half as large as computed from the stereophotogrammetric measurements, but probably more reliable than the latter, which was obtained in a very simplistic analysis. Both analyses confirm that a large peak stress in the process zone is attained, which explains why energy amplification by remote plasticity becomes operational
and significantly toughens these composites.

5- Time-Dependent Hardness of Particulate-Filled Composites - Ingenta.

Abstract: Time-dependent hardness of calcium carbonate-polyethylene composites prepared by co-rotating twin screw extrusion has been determined. Hardness of composites were shown to be a power increasing function of the amount of calcium carbonate particles, but decreased as the time under load increased. The degree of time-dependent hardness was observed to be unaffected by filler concentration. All compositions showed similar percentage of hardness decrease with increasing dwell time. A graphical method was devised and able to apply to map the hardness of various filler volume fraction composites at any defined dwell times.

6-Influence of particle size and particle size distribution on MICA filled nylon 6 composite - Springlink

Abstract: Particulate reinforced thermoplastic composites are designed to improve the properties and to lower the overall cost of engineering plastics. In this study the effects of particle size and particle size distribution on the properties of mica filled nylon-6 was investigated. Composites of nylon-6 with varying concentrations (viz. 5 to 40 wt%) of mica were prepared by twin screw extrusion. The composite showed improved mechanical, thermal as well dielectric properties on addition of filler.