Zeal Press
Not a member yet
427 research outputs found
Sort by
Effect of Embrittlement on the Microstructure, Mechanical and Wear Properties of Aged Super Duplex Stainless Steel
Get PDFIn the present study, the effect of embrittlement on the microstructural features, mechanical and dry sliding wear properties of AISI 2507 super duplex stainless steel (SDSS) has been discussed. Prior to heat treatment the SDSS has been solution treated. Further, SDSS has been heat treated at 475°C for 60 min and then quenched in water and oil at room temperature. The heat treatment has led to the embrittlement in SDSS owing to the decomposition of ferrite phase by spinodal decomposition into two phases, Cr-rich (α΄) phase and Fe-rich (α) phase. Embrittlement of super duplex stainless steel resulted in significant improvement in ultimate tensile strength and hardness. However, a decrease in the impact energy has been observed. Oil quenched super duplex steel has better wear resistance compared to water quenched and solution treated steels
Systems of Measurement for the Construction of Geometrical Models
Get PDFIn the present work, the relevant components of the two basic system of measurement are defined through the analysis of existing systems of measurement for geometrical modeling. The major features of such systems related to the ways of formation of the two-dimensional complex drawing of a geometrical image on the basis of laws of projective connections are revealed. Interrelations of the elements of different systems of measurement with various projections of a geometrical image are defined. The relative location of projections of a geometrical image into the constructed two-dimensional complex drawings for various systems of measurement is discussed. The rationale behind a particular arrangement of views in the projective drawing of a product in the analyzed systems of measurement is explained
Chemical Synthesis of Marble Powder-Fly Ash Doped Poly (Vinyl Alcohol) Composites and Comparison between their Structural, Thermal and Mechanical Properties
Get PDFIn this study, poly (vinyl alcohol) based composite materials were produced. Fly ash and Karaman Beige and Rosso Levanto marble powders were taken by Alacakaya Marble and Mining Business and they were used as fillers. Composite materials (at the rate of 1/20 by mass) were produced. The microstructure analysis of the materials was examined by Scanning Electron Microscope. Fourier Transform Infrared Spectrophotometer analysis was used to get information about the functional groups in the structures of the materials. The thermal behavior of the materials was analyzed by Differential Thermal Analysis and Differential Scanning Calorimetry at the same single heating rate of 10 C/min. X-Ray Diffraction analysis was performed to determine the crystallographic properties of the materials at room temperature. The mechanical and physical properties of the obtained materials were examined by stress-strain analysis
Light Weight Aluminum Cartridge Case Design for IED’s Application - ANSYS
Get PDFThis paper describes the design analysis of the aluminum cartridge case, its testing, Analytical Simulation (ANSYS) and evaluation against Improvised Explosive Devices (IEDs) applications. Aluminum material is light in weight, non-corrosive and compatible with the propellant. Because of excellent properties, it is widely used in defence application sector. In the armament system, an effort is being made to reduce the cost, the weight of material from logistic point of view and its manufacturing process so as to meet the design requirements. Brass cartridge cases are being widely used in various types of ammunition for last 100 years e.g. armaments of small arm cartridges, artillery shell and power cartridges for fighter aircraft. Cartridges are made of either aluminum, steel or brass is filled with the propellants and pyrotechnic composition. With suitable means of ignition, the propellant generates the hot combustion gases at high pressure and temperature. These combustion gases are utilized to perform certain work on the system. The aluminum cartridge case for water disruptor applications plays a significant role in the destruction of the suspicious objects. This paper discusses the design aspects of the aluminum cartridge case for disruptor application of suspected IEDs. Performance evaluation parameters i.e. maximum pressure (Pmax) and time to reach maximum pressure (TPmax) of aluminum cartridge have been carried out in a Closed Vessel (CV) using a Data Acquisition System (DAS). The material properties of aluminum such as tensile strength, percentage elongation and yield strength are determined using a Universal Testing Machine (UTM). Using the data obtained by the above methods, an attempt has been made to determine stress, strain and deformation of the cartridge case theoretically and numerically using ANSYS software. The results obtained by both methods are compared. The results are in good agreement with each other. It is observed that the percentage error for von -Mises stresses is 10.2 % using numerical and theoretical approaches. The percentage error between numerical and theoretical values of the hoop and longitudinal stresses are 6.71 % and 6.78 %. The percentage error between numerical and theoretical values of the hoop and longitudinal strains are 1.36 % and 3.64 %. The errors between theoretical and numerical values for radial displacements are 2.83 %. The novelty in this research work is that the design analysis of aluminium cartridge case is carried out using ANSYS software simulating the real- world problem. The analytical results are compared with numerical results. The actual pressure experienced by the cartridge case generated by the propellant burning is taken into consideration. This pressure is measured by a pressure transducer fitted over a specially designed test rig using a DAS. The sample of aluminum case is tested for hardness and microstructure. The results show there is no significant difference before and after the hardness and microstructure of the material. The results of ANSYS for stress and strain are in good agreement with theoretically calculated results and numerical analysis as percentage error is less than 11. This draws the inference for validating numerical and theoretical results. It is seen that 57.352 % saving in weight using aluminum cartridge is achieved. Using ANSYS, hoop stress 382.7 MPa, Hoop strain 4.32x10-3, longitudinal strain 0.8602x10-3 and longitudinal stress 191.5 MPa are estimated. The main objective of this paper is to carry out design and analysis of aluminum cartridge case analytically as well as numerically
Adaptive Structures and Biomimetic Robots – A Perspective
Get PDFThis paper gives an overview of some recent full-scale demonstrations of morphing devices capable of providing innovative capabilities to general systems in changing shape and improving performance significantly during operations. In aeronautics, large progress has been observed over the last few years, meaning that this technology is rapidly transitioning from laboratory scale to high TRL demonstrators. The most advanced concepts already proved to withstand loads with minimal deformation while having the capability to change their geometry to attain additional benefits with respect to their original mission. In the same way, robotics has become one of the most prominent technological trends of the current century. The rapid increase in their use and development has significantly changed our society by gradually replacing a large share of human jobs. Such an evolution is also rapidly accelerating, as technological advances in automation, engineering, artificial intelligence, and machine learning converge. Since both domains involve the integration of actuators, sensors and controllers and face integrity challenges in harsh environments, they may be seen somehow related and probably share a common future. In this article, the authors propose an original view of a possible future scenario that is likely to consider a unique development path for research on adaptive structures and robotics
A Framework for Fully Automated Home using IoT Reliable Protocol Stack and Smart Gateway
Get PDFA fully automated house must ensure all the appliances must be connection and provide a smart way of working for the human. The insight of Internet of Things (IoT) network provision the necessary platform to implement the automated home. The proposed system emphasizes, how all the appliances would be connected to IoT to ensure fully automated home. In this framework the smart home has been divided into various areas like smart kitchen, smart gardening, home safety and security system, and smart lightning system. The reliable protocol stack has been utilized to provide efficient communication along with proper security measures. The reliable protocol suite works on top of MQTT and TCP to ensure reliable communication. The smart gateway utilized for this framework and provides firewall security as with a two-phase filtering mechanism as well as scalability. among all the appliances in the home
An Improved Multiple Damage Identification Method of Plate Structure Using Discrete Wavelet Transform
Get PDFIn order to improve the identification accuracy of multiple damage of the plate structures, a method based on a two-dimensional discrete wavelet transform is proposed. Firstly, the structural characteristic parameters of the undamaged and damaged plate structures are obtained through the finite element modal analysis. The discrete wavelet transform is used to decompose and evaluate the modal node displacement data of the rectangular thin plate, and the high frequency information and singular values of the structural damage location are calculated. Secondly, the quantitative analysis of damage is realized by the change rate of the maximum value of the wavelet coefficient. Finally, according to the proposed algorithm, the anti-noise performance of the algorithm is verified through different ratios of noise. The results are shown that the vibration-based damage identification method is effective to detect the location and severity of the rectangular thin plate structures, which can be used to solve the damage identification problems of complex structures
Synthesis, Characterization and Conductivity Properties of Polystyrene/Polyacrylonitrile/Polyindole Ternary Composites
Get PDFIn this investigation, polystyrene/polyacrylonitrile/polyindole (PSt/PAN/PIN) ternary composites with various amounts of PSt, PAN and PIN were synthesized using FeCl3 as an oxidant agent by chemical polymerization technique. The formation of ternary composites was assisted by Fourier transform infrared spectroscopy. Morphological studies demonstrated all composite have a smooth surface. The results of thermal gravimetric analysis indicate that incorporation of PIN in composites advances the thermal stability. X-ray diffraction analysis show that the amorphous nature of PIN and its ternary composites. The conductivities of PIN and the PSt/PAN/PIN composites were investigated with a four-probe technique. The conductivity of PIN was found to be 5.0 × 10–3 S cm–1, also the conductivities of the PSt/PAN/PIN composites were determined to 3.5 × 10–4, 7.4 × 10–4, 1.3 × 10–3, 2.2 × 10–3 and 2.8 × 10–3 S cm–1 respectively, with 9, 27, 45, 63 and 81 wt % of PIN
Spectral Beam Splitting Technology for Photovoltaic and Concentrating Solar Thermal Hybrid Systems: A Review
Get PDFAs a promising technology, spectral beam splitting (SBS) technology is the research focus currently in photovoltaic and concentrating solar thermal (PV/CST) hybrid systems. Spectral splitting filters can optimally exploit the solar spectrum and reach higher conversion efficiencies of solar energy. In this paper, we provide a review of the recently published research in spectral splitting filters and summary the research details of SBS technology, including the proposed methods, types, materials, performance advantages, technical obstacles of the filters. Moreover, the paper presents the research status of the SBS technology and evaluates the prospects of various filters in PV/CST hybrid systems. This review can help the researchers and practitioners better understand the SBS technology and features of different spectral splitting filters for the PV/CST hybrid system
Corrosion Inhibitive Effects of Siam Weed Extract on Mild Steel in 1M H2SO4 Medium
Get PDFCorrosion inhibitive effects of Siam weed extract on A36 mild steel in 1M H2SO4 medium was investigated at two corrosion reaction of 278 and 320K. Better inhibitive performance of the Siam weed extract was noticed at 278K. The results of the gravimetric tests revealed that the Siam weed extract was a good corrosion inhibitor for the mild steel with Langmuir adsorption isotherm mechanism, spontaneous and physiosorption in nature