Search

In modern times it is seen that the use of aluminum alloys has increased greatly in automobile, aerospace, marine, and various other fields. This is due to the fact that aluminum alloys have superior advantages when it comes to corrosion resistance, strength to weight ratio characteristics, and high machinability when it is compared with steel. In this paper a study on the mechanical, tribological properties and microstructure of aluminum alloy with variations in Nickel (Ni) and Iron (Fe). Previous studies that have been conducted in this field have dealt with aluminum additives of different compositions with the study of only mechanical properties or microstructure. Our project deals with the study in the changes of properties and microstructure analysis of Iron(Fe) and Nickel(Ni), aluminum-based alloy added to which the tribological studies and the correlation is studied with the variations in the metal concentration, Thus the study and development of these alloys are important as it paves the way for the new generation of mechanical components with superior properties. Also, our paper deals with the fabrication of a brake disc rotor with the most suitable alloy among the three. The tensile strength, hardness, and surface characteristics of all the profiles were studied in detail and presented. The 7% of Iron powder in the profile has the highest tensile strength.

In this article, a numerical investigation is conducted to analyze three-dimensional incompressible Navier-strokes flows through the rectangular divergent square ribbed channels with different Reynolds number value 20,000, 40,000 and 60,000 having five different configurations of square ribs (p/e = 2.5, 3.33, 5, 10, and 20) has been used as roughness element. The commercial finite-volume based CFD code ANSYS FLUENT is used to simulate turbulent airflow through the channels. The RNG k-e turbulence model is used to solve the transport equations for turbulent flow energy and dissipation rate. Detailed results about average heat transfer and fluid friction in a rectangular divergent square channel are presented and discussed.

Ballistic performance of high-nitrogen steel (HNS) plates and RHA steel plates were evaluated against 7.62 mm ball and 12.7 mm armour piercing (AP) projectiles The impact velocities of 7.62 mm ball and 12.7 mm armour-piercing projectiles were 850 ± 10 m/s and 840 ± 10 m/s respectively. Critical thickness at which projectile is stopped was found from ballistic tests on different thickness targets and it was used for comparing the ballistic performance. HNS plates showed improved impact resistance (in terms of minimum areal density at which projectile is stopped) than that of RHA steel plates against both 7.62 ball and 12.7 mm armour piercing projectiles. Improved impact resistance of HNS plates could be correlated with its superior high strain rate flow stress values with respect to RHA steel. Microstructural evaluation revealed that adiabatic shear band induced plugging and ductile-hole growth are the major failure modes in both targets against 7.62 ball and 12.7 AP projectiles respectively.

A collector is a device that can convert the available sun’s radiations into some useful heat energy with better entrapment of sunlight and is economical too. To heat the water and aqueous fluids, flat plate collector (FPC) is widely used. The main objective of this study is to find out the alternate for FPC with improved performance. Solar cavity collector (SCC) is one such type of an enhanced model of FPC. It consists of five cavities that have an arrangement for inlet and also outlet tubes to flow over. The same has been constructed with copper pipes as a receiver material to carry out the trails in order to find the suitable parametric study. The performance of any collector affects mainly the physical modifications of the collector. Therefore, the performance of SCC includes the prime parameters such as the out-turn of aperture entrance gap and cavity structure outer cover materials. Water rate of flow and comparison of SCC and FPC are the other parameters considered for the current study. Experimental results have to be compared with any simulation tool in order to achieve better performance. Using the Artificial Neural Network (ANN) tool of the MATLAB software, the simulations have been validated. The successful creation of the progressed model in ANN has the set of variables that are fetched out. The experimental and simulated end results match with each other in an appropriate manner.

Aluminium is easily available low cost material but the emissivity of the aluminium is very low which is minimum 0.02 to maximum 0.54 for the pure level with different form like polished, highly polished, oxidized, un-oxidized and anodized conditions and different formations. So in this investigation focused to increase the emissivity of the Aluminium surface. There are number of methods and materials were available to reach the motive of this requirement among them coating method and 75Ni-25Cr alloy material considered for this experimental investigation. Square plates were considered and the corresponding temperatures measured with the help of thermocouples located on the particular point of the surface. The commonly used normal black body used as a reference surface for this investigation. There are increased radiant heat input create impact on the values surface which leads to identify the purpose of this material coating.

The paper represents the numerical investigation of heat transfer characteristics in a pipe provided with twisted tape inserts is analyzed. The heat transfer was analyzed in a swirling flow conditions using CFD simulation. A commercial CFD package was used for analyze twisted tape for circular tube fitted with triangular cut twisted tape and circular hole cut twisted tape inserts. The twisted tape system allows a significant increase of convective heat transfer coefficient by introducing the swirl flow motion. The swirl flow motion provides greater heat transfer rate extracted from the solid surface of the tube. The depth of cuts for triangular cut 5 mm and depth of hole cut 5 mm twisted tapes were used for simulation generation. In this paper CFD analysis was used for enhancement of heat transfer rate of fluid of laminar flow. The experimental investigation were conducted in double pipe heat exchanger and these value of plain twisted tape, triangular twisted tape and circular hole cit twisted tape were taken for used simulation analysis. The performance of heat transfer rate was enhanced 1.1–1.3 times compared that the plain twisted tape and circular cut twisted tape. The data obtained from the simulation correlations for triangular cut twisted tape and circular hole cut twisted tape; and these data were correlated with plain twisted tape.

A host-guest inclusion complex of hydroxy propyl β-cyclodextrin (HBCD) and 2-methyl mercapto phenothiazine (2MMPT) was prepared and investigated in liquid state and in solid state. In liquid state, UV-visible and fluorescence spectroscopic methods are used to investigate the inclusion complex. The binding constant of 2MMPT: HBCD inclusion complex was calculated using Benesi-Hildebrand plot. The 1:1 stoichiometric ratio of inclusion complex was derived from Benesi-Hildebrand plot and Job’s plot of continuous variation method. The solid HBCD: 2MMPT inclusion complex was prepared by coprecipitation method and characterized using FT-IR, 1 H NMR, 13 C NMR, and ESI-MS analytical methods. The cytotoxicity of HBCD: 2MMPT inclusion complex was studied on human breast cancer cell line MCF 7 showed that the cell cytotoxicity of HBCD: 2MMPT inclusion complex was close to free 2MMPT and inclusion complexation with HBCD retained the anticancer activity of 2MMPT.

Additive manufacturing (AM) is a technology rapidly growing on a number of industrial sectors. It provides design freedom and ecological/environmental advantages and highly 3D complicated parts also we can make without any restriction. Several investigators have established the direct and indirect use of Fusion Deposition Modeling (FDM) manufactured parts as final products in industrial application, such as turbine blades the concept of rapid tooling and rapid casting of certain aluminum parts using FDM parts as patterns. Albeit industrial application all the component should be expected as highly accurate parts to give up the better output to the end user. The present research work investigates the relationship with the three process parameters namely fill density, horizontal and vertical orientation of part with circularity of FDM manufactured parts. In this research ABS material chosen for experimentation, design of object is made by Creo 3.0 software and is converted to stl file imported to uPrint SE FDM machine and the part is manufactured. The DOE, Taguchi method and ANOVA are used to obtain the optimum combination of the parameter for minimum circularity error on both inner and outer circle. The causes for variation are found and recommended for industrial best fitness functions.

Effect of heat treatment on mechanical properties and ballistic performance of a new α+β titanium alloy Ti–4Al–2.3V-1.9Fe against 7.62 mm ball projectiles was studied. A 20 kg ingot of Ti-4Al-2.3V-1.9Fe was produced by vacuum arc remelting and thermo-mechanically processed to 15 mm thick plates. These plates were subjected to different heat treatments and their mechanical properties and ballistic performances were evaluated. Plates that were solution treated below the β-transus temperature followed by aging exhibited good combination of strength and ductility and better ballistic performance.