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Full-Text Articles in Engineering
Understanding The Effects Of Addition Of Copper Nanoparticles To Sn-3.5 Ag Solder
Understanding The Effects Of Addition Of Copper Nanoparticles To Sn-3.5 Ag Solder
A.S. Md Abdul Haseeb
Purpose - The purpose of this paper is to focus on the fabrication of SAC nanocomposites solder and discuss the effects of nanoCu addition on the structure and properties of resulted nanocomposite solder. Design/methodology/ approach - Ball milling is a nonequilibrium processing technique for producing composite metal particles with submicron homogeneity by the repeated cold welding and fracture of powder particles. This method is believed to offer good processablity, precise control over the solder composition, and produce more homogeneous mixture. Findings - It is found that the melting temperature, the wetting behaviour, and hardness are improved when the Cu nanoparticles …
Mode-I Toughness And Curing Pressure Characterisitc Of Symmetrical Lay-Up Of Plain Weave Woven Gfrp Composites, Mohd Aidy Faizal Johari, Kiam Beng Yeo, Mohd Noh Dalimin
Mode-I Toughness And Curing Pressure Characterisitc Of Symmetrical Lay-Up Of Plain Weave Woven Gfrp Composites, Mohd Aidy Faizal Johari, Kiam Beng Yeo, Mohd Noh Dalimin
mohd aidy faizal johari
This study describes an experimental study on the interlaminar Mode-I fracture toughness behavior of hand lay-up plain-weave woven GFRP laminate by using a fracture energy method of evaluation. Mode-I double cantilever beam (DCB) tests were performed on woven GFRP unsaturated polyester composite, E-Glass EWR 600 NISER, specimens. The specimen design and test procedure are performed with reference to the BS ISO 15024 and ASTM D5528. Various curing uniform pressure distribution has been investigated at 35.8kg/m2, 70.1kg/m2, 104kg/m2 and 138.2kg/m2, with respect to the toughness value. The lay-up laminates designed with symmetrical arrangement at the center-plane of the composite are also …
Stabilization Of Residual Soil With Rice Husk Ash And Cement, Hilmi Mahmud
Stabilization Of Residual Soil With Rice Husk Ash And Cement, Hilmi Mahmud
Hilmi Mahmud
Stabilization of residual soils is studied by chemically using cement and rice husk ash. Investigation includes the evaluation of such properties of the soil as compaction, strength, and X-ray diffraction. Test results show that both cement and rice husk ash reduce the plasticity of soils. In term of compactability, addition of rice husk ash and cement decreases the maximum dry density and increases the optimum moisture content. From the viewpoint of plasticity, compaction and strength characteristics, and economy, addition of 6-8% cement and 10-15% rice husk ash is recommended as an optimum amount. © 2004 Elsevier Ltd. All rights reserved.
Velocity Effects On The Wear, Friction And Tribochemistry Of Aluminum Mmc Sliding Against Phenolic Brake Pad
A.S. Md Abdul Haseeb
Two aluminum metal matrix composites (MMC) reinforced with 13 vol.% of SiC or B4C particles were made by stir casting followed by hot extrusion. Effects of sliding velocity on the wear, friction and tribochemistry of the worn surfaces of both composites sliding against a commercial phenolic brake pad have been investigated under dry condition. The wear tests were carried out using a pin-on-disc type apparatus at two linear sliding speeds: 1.62 and 4.17 m s-1 under a constant contact pressure of 0.75 MPa for a sliding distance of 5832 m. The coefficient of friction was recorded and wear rate of …
Transport Processes In Random Arrays Of Cylinders. I. Thermal Conduction, Ashok S. Sangani, C. Yao
Transport Processes In Random Arrays Of Cylinders. I. Thermal Conduction, Ashok S. Sangani, C. Yao
Ashok S. Sangani
A numerical method is developed that takes into account the many particle interactions in a rigorous manner to determine the effective thermal conductivity of Km of a composite medium consisting of parallel circular cylinders of thermal conductivity ak suspended in a matrix of conductivity k. Numerical results for Km are presented for a wide rane of a and o, the area fraction of the cylinders, after averaging over several computer-generated random arrays of cylinders. The results obtained via this exact method are compared with those of various approximate analystical methods to assess their utility in predicting Km.