18 research outputs found
Fracture analysis of AA6061-graphite composite for the application of helicopter rotor blade
The main objective of the work is to study the fracture behavior of AA6061-graphite material using both experimental technique and finite element simulation by considering helicopter rotor blade as a case study. From the case study, it has been observed that the helicopter rotor blade, made of AA6061, has been failed at the threaded portion of the hole. Experimental fracture toughness is carried out using the compact tension specimens as per ASTM standard testing procedure. Modeling of compact tension specimens and the threaded portion of the bolt hole was utilized to analyze the fracture toughness using a simulation tool. From the results and the comparison, it is recommended to use AA6061-9wt% graphite material as a replacement of AA6061 in the application of main rotor blades of the helicopter
Effect of Quenching Medium on Hardness of Carburized Low Carbon Steel for Manufacturing of Spindle Used in Spinning Mill
AbstractHeating or cooling of a metal can change its microstructure, which causes variations in the mechanical and physical properties and affects the behavior of the metal in processing and operation. By using the heat treatment, metal properties can be improved for the application in engineering fields. There are different spare parts used for different purposes collected from foreign countries in Spinning Mills available machine in Bangladesh. Spindle is an important part of spinning mills. The locally available raw materials are low carbon steel from which spindle can be made through property development by heat treatment. But to achieve the desire hardness and strength it is difficult to get the spindle without bending in heat treatment due to the length of spindle is too high to its diameter. Time and temperature of carburizing, quenching is the very sensitive issue to get a sound job with desire properties. In this research, quenching temperature, time and medium was considering in heat treatment process. Finally the spindle was prepared through heat treatment with desired properties comprising in a practical field of spinning mill. All the process was explained clearly for the preparation of spindle for spinning mill from locally available low carbon steel
An Iteration Method for Singular Fields around an Interface Edge of Elastic/Power-Law Hardening Materials Joint
Surface synthesization of magnesium alloys for improving corrosion resistance and implant applications
In the field of biodegradable material, a new research area has emerged for magnesium (Mg) and its alloys because of its high biocompatibility and biomechanical compatibility. This review summarizes many important types of research that have been done on degradable coatings on magnesium and its alloys for various implant applications. When magnesium alloys come into contact with other metals, they have a low open circuit potential and are consequently prone to galvanic corrosion. When exposed to air or a humid environment, magnesium may rapidly oxidize and generate a thin layer of loose MgO. Its applications were limited due to these drawbacks. Different types of corrosion have been studied in relation to magnesium and its alloys. Several coating methods are described, split into conversion and deposition coatings based on the individual processing procedures employed. This paper covers the most recent advancements in the development of biodegradable Mg alloy coatings over the last decade, revealing that the corrosion resistance of Mg and its alloys increases in most of circumstances due to coatings. Corrosion rate, coating morphology, adhesion, and surface chemistry were identified and explored as significant elements affecting coating performance. Calcium phosphate coatings made by deposition or conversion processes established for orthopedic purposes are the focus of many investigations according to a review of the literature. More research is needed on organic-based biodegradable coatings to improve corrosion resistance. Improved mechanical qualities are also crucial for coating materials. Developing adequate methodologies for studying the corrosion process in depth and over time is still a hot topic of research
Advances of MAX phases: Synthesis, characterizations and challenges
Abstract MAX phases and their MXene compounds have received significant attention owing to their extensive potential applications. The quality and purity of the MAX phase guarantee the desired quality of the MXene product, which is essential for a variety of applications, including energy storage, catalysis, and electrical devices. Due to the purity, quality, complex structure, and unavailable commercial pure MAX powders, it is frequently required to have sophisticated synthesis and characterization techniques for the expected MAX products. Many researchers entering this field seek a comprehensive approach to the synthesis and characterization of MAX phases. Despite this, a significant portion of existing reviews have overlooked the synthesis and characterization methods specific to MAX phases, particularly when addressing MXenes. Consequently, this review aims to offer a thorough overview of the various synthesis methods and characterization techniques that are often required for MAX phases. In this review, various synthesis techniques, including their advantages and disadvantages, have also been discussed. Characterization techniques, especially x‐ray diffraction (XRD), were found to be quite critical for new researchers. However, the integration of other techniques such as scanning electron microscopy, transmission electron microscopy, x‐ray photoelectron spectroscopy, and infrared analysis enhances and complements the findings obtained through XRD. The review also underscores the challenges associated with MAX phase synthesis and proposes potential solutions, emphasizing the assessment of their suitability across a broad spectrum of applications. Overall, this review serves as a comprehensive resource and guide for researchers engaged in the exploration and application of MAX phases, emphasizing the essential techniques of synthesis and characterization in harnessing their massive potential
Negative dielectric constant and impedance analysis of novel self-generated Ti3AlC2 and Ti4AlN3 Max phase reinforced boron composites
In this research work, the capacitance, inductance, impedance and dielectric constant of novel self-generated Ti3AlC2 and Ti4AlN3 MAX phase reinforced boron composites (Ti4AlB2C and Ti4AlB2N) are studied using precision impedance analyzer. Before that, the synthesized composites were sintered at different temperatures from 950 °C to 1325 °C. In the analysis, the positive impedance is found for both the compounds. But the negative capacitance, inductance and dielectric constant are significant in all the cases, which can improve the electrical conductivity of interconnects in semiconductor circuits and lower resistive losses and ultimately can improve over all device performances
Development and characterization of eco-friendly starch-based plastic reinforcing tea for packaging applications
Petrochemical-based plastics are posing a threat to human existence because of their toxic nature and slow biodegradation rate. However, biodegradable plastics manufactured from natural ingredients are showing hope. The current work deals with developing and characterising starch-based bio-plastic where white vinegar and glycerol have been used as matrix materials and tea has been used as filler material. The developed bio-plastic samples were characterized by soil biodegradation test, Mechanical test, Fourier Transformed Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Thermogravimetric analysis (TGA) and Differential Scanning Calorimetry (DSC) analyses. More than 60% of degradation occurred within 28 days. The results proved that the bio-plastic synthesized using used tea has higher tensile strength than those synthesized using black tea. Higher melting point and glass transition temperature were also obtained from the sample synthesized using used tea, confirmed by TGA and DSC analysis. The FTIR analysis confirmed the presence of various organic functional groups. The obtained results were compared with the results available in the literature. Based on the results, the developed bio-plastic samples can be successfully used in packaging applications