A particulate composite material was prepared by adding (CaCO 3 , CaO, MgCO 3 , MgO) ceramic particles with particle size of (< 53 µm) to unsaturated polyester resin with weight fraction of (3, 6, 9, 12, 15)% and fixed amount of CaF 2 (0.5% wt.). The results had revealed that the maximum

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This study included the preparation of specimens of epoxy reinforced by silver oxide. Some of their mechanical properties been studied such as hardness, compression strength and wear rate with volume fraction 2%,4%,6%. The results showed that the mechanical properties hardness and compressive were affected directly by the increase of the volume fraction of the reinforcement material. The samples with the highest volume fraction had the highest hardness and compressive strength. As for the wear test was conducted in the circumstances of changing the applied load 40,60,80 N were approved, respectively, results shown that the rate of wear increases with load increasing of all samples before and after the reinforcement. For the relationship of the rate of wear with the increasing of the volume fraction, the results showed that there is a decrease in the rate of wear with the increasing of the volume fraction.

In this paper, friction stir welding (FSW) has been focused on 3003 - H14Al alloy (AA).The welded specimens have been organized. Under dissimilar rotational rates of 1200, 1400 and 1600 RPM with feeding rate of welding 30 mm/min, mechanical features of joints like tensile strength and Micro-hardness have been investigated. In relation to measured fallouts, the machine-driven features of joints have been intensely influenced by dint of welding limitation. The finest con sequences of gained welding under 30 mm/min and 1400 RPM for welding velocity and rotating rate respectively. Accordingly, the efficiency gets 84% with respect to ultimate tensile strength (UTS) of parental metal. For 3003 - H14-W Aluminum alloy, this study has established the finite element simulation of FSW. Numerical simulations to identify the association of those factors with peak temperature have generated the investigations of specific heat, thermal conductivity and density. Simulation model has been verified with investigational consequences. The simulated consequences have agree with the experimentation consequences.

In this paper, the effect of weight fraction and frequency on dielectric properties of polymethylmethacrylate filled with copper nanobud particles is studied. copper nano particles were synthesized by chemical reduction method. The resultant copper nano particles were characterized by UV-Vis spectroscopy and X-ray diffraction (XRD). Results show that the Cu Nps have bud shapes, and their average particle size obtained from the XRD study is 53.78 nm. For the resultant composite materials, such as the dielectric behavior of composite materials reinforced with 5%, 10%, 15%, and 20% weight fractions of copper nanobud particles and frequency ranges of 50, 250, 103, 104, 105, and 106 Hz at 25 °C were investigated. Results reveal that the dielectric constant, dielectric loss factor, and dissipation factor increased with the increase in weight fraction of copper nanobud particles due to their high conductivity. The dielectric constant, dielectric loss, and dissipation factor decreased with the increase in frequency.