Advanced Materials Research Vol. 705

Abstract: Construction system using timber frame with earth brick infill shows the formation of cracks at their interface with the fluctuation of temperature and humidity. Geopolymer binder has been identified to create good adhesion between these two materials. The aim of the study is to characterize the pullout and shear mechanical behavior of laboratory masonry assemblies of wood, geomaterial binder and extruded earth brick. Compression test on the brick were also performed. Full-field deformation of double shear test sample werecarried-out by digital image correlation (DIC) in order to better describe and understand the mechanical behavior. The geopolymer binder show good adhesion properties with mean shear test results around 1.5 MPa and pullout test result around 0.82MPa.

Abstract: A cost-effective and sensitive spectrophotometric method for the determination of arsenate in dried shrimp has been developed using molybdenum blue as a chromogenic reagent. The method is based on arsenate conversion to arsenomolybdate heteropoly blue having an absorbance maximum at 870 nm. The effects of pH, time, temperature and light on its complex formation were investigated. The optimal complex formation condition at pH 4 in 90 min at 15+1°C was obtained and the blue color was favorable developed in daylight. The proposed method has been successfully applied for the determination of arsenate in samples with the addition of DTPA to eliminate the interferences resulting in increased selectivity. The standard addition calibration graph was constructed with the linear range extended to 40 μgL^-1 (r² = 0.9987). The detection limit (S/N = 3) of 3.21 μgL^-1, and the precision of 3.13% (RSD) were obtained. The method has good recovery of 95% for the determination of arsenate. The amounts of arsenate in dried shrimp samples compared with those obtained from ICP-OES were shown to be in good agreement (r = 0.998).

Abstract: In the paper we consider an inverse problem for the three-dimensional nonlinear pseudoparabolic equations describing the Kelvin-Voight motion. The inverse problem consists of finding a velocity field and pressure which is gradient and also a right-hand said of the equation. Additional condition about the solution to the inverse problem is given in the form of integral overdetermination condition. The existence and uniqueness of weak generalized solution of this inverse problem in the sobelev space is proved.

Abstract: Effect of strain rate on mechanical properties of pure iron was studied by compression experiments using Gleebe-1500D thermal simulation testing machine and Split-Hopkinson Pressure Bar, indicating that pure iron only has strain rate hardening effect. Adiabatic temperature rise tends to increase with increasing the strain rate. Work hardening effect is also analyzed. It found that there are only two work hardening regions in static stage (10^-3 to 1 s^-1) while there are three work hardening regions in dynamic stage (650 to 8500 s^-1). It is on account of onset of twining at high strain rates.

Abstract: In addition to electrical design and function, corrosion resistance is an important factor in producing earth rod and plate which indicate quality of these products. The ability of an electrical grounding component to resist corrosion determines its service life.Different production methods has been tried to reach the maximum corrosion resistance but electro deposition process specially alloyed covering used in this research is the most successful method. In this research innovation of the invented process is described, then to confirm the method, corrosion resistance of the covered Earth rod and plate is tested. Phenomenal results indicated that even with 100 micron thickness of the new coating layer, corrosion resistance reaches the required time of resistance. Also by increasing the layer thickness, corrosion resistance is increased.

Abstract: Analytical formulations and solutions to the static analysis of simply supported Functionally Graded Material (FGM) plates hitherto not reported in the literature based on a higher-order refined shear deformation theory with nine degrees-of-freedom already reported in the literature are presented. This computational model incorporates the plate deformations which account for the effect of transverse shear deformation. The transverse displacement is assumed to be constant throughout the thickness. In addition, another higher order theory with five degrees-of-freedom and the first order theory already reported in the literature are also considered for comparison. The governing equations of equilibrium using all the computational models are derived using the Principle of Minimum Potential Energy (PMPE) and the analytical solutions are obtained in closed-form using Naviers solution technique. A simply supported plate with SS-1 boundary conditions subjected to transverse loading is considered for all the problems under investigation. The varying parameters considered are the side-to-thickness ratio, power law function, edge ratio and the degree of anisotropy. Correctness of the formulation and the solution method is first established and then extensive numerical results using all the models are presented which will serve as a bench mark for future investigations.

Abstract: The Y and T pipe joints production has recently been noticed by the researchers and industrial men.This paper, approved by the Ministry of Energy, is a part of the research result that analyzes the effect of surface grooves on the Counterpunch and friction coefficient on the pipe wall surface in pipe hydroforming Process for cross shaped joint production.The simulation results show creating the groove on the counterpunch surface causes distribution of thickness in bulged region changes. More over these results show that thickness distribution is a complex function of friction coefficient.

Abstract: Recently, production of complex parts in car and aircraft industries, gas, water and hydraulic systems by hydroforming process has widely been used. Resistance of these parts, strain and displacement are factors whosedetermination isimportant. Strain and displacement are factors which determine the strength of the part. In this research,we will compare distance between latticed results obtained from theoretical method and practical works.

Abstract: New iron cathode materials: strontium hexaferrite, spinel-like ferrites of copper, lithium, and zinc, as well as α-and γ-phases of iron (3+) oxide are proposed. Chronopotentiometry method allowed demonstrating the possibility to use ferrites and iron (3+) oxides as the positive electrode materials for lithium batteries.