Applied Mechanics and Materials Vol. 912

Abstract: Direct-drive electric motor or In-Wheel Hub Motor (WHM) is gradually becoming popular as a new solution for electric propulsion. By meas of direct drive, the conventional transmission of belt or chain sprocket is not required to deliver the high torque requirement at the wheel. This paper studied metamodel machine leasning (MOP-ANN) implementation to predict the relationship model of geometries input of 42 slot/40 pole WHM with corresponding output performance. The multi-layer perceptron (MLP) of the neural network structure was trained to reveal the underlying pattern within the data sample. The sample data was obtained from a sensitivity analysis drive from FEA. The optimum geometry of the motor was directly solved by implementing a multiobjective optimization (MOO) method of genetic algorithm. Finnaly, the optimum geometry of the MOP-ANN based result is validated by FEA.

Abstract: The most promising direction in alternative energy is hydrogen energy, using hydrogen as a secondary energy carrier. A key component in hydrogen energy is a fuel cell, especially on solid polymer membranes. Increasing the efficiency, reducing the cost and increasing the service life of such elements is the primary task of this direction. These tasks need to be solved from two sides: by improving the parameters of platinum catalysts in electrochemical reactions of energy sources, as well as by improving the qualities of the membrane. The aim of the work is to synthesize and study composites with palladium and platinum nanoparticles in hydrogen-oxygen fuel cells.

Abstract: This work is devoted to the development and research of functional and physico-chemical parameters of electrodes based on nanocomposite metals for water electrolysis. As a functional matrix support the nickel foam was chosen. The synthesis of bimetallic nanoparticles of nickel-platinum with further application to nickel foam was carried out. Particle sizes were investigated by electron microscopy methods. Resource tests of electrolysis cells constructed on the basis of the obtained electrodes were carried out.

Abstract: In recent years, the emphasis has shifted toward more precious minerals and composite structures to produce thinner, cheaper, more suitable materials for specific applications. The primary purpose of this study would be to determine how any walnut fillers perform in a vulgare biocomposite. The nanocomposite was created employing the most economical manual lay-up method. To accomplish the legitimate goal, the following descriptions have been levied: At different levels, (i) volume ratios of luffa thread, (ii) weight ratios of walnut powder, as well as (iii) freezing processing durations, all are accessible. The multilayer aggregates are in a freezing room set to 77 degrees Celsius. Tension and elastic modulus were tested mechanically. The morphological properties of powdered particles were detected using a scanning electron microscope. The mechanical integrity of 10% walnut shell powder, 40% luffa fabric, as well as 15-minute freezing treatments, surpasses 5 and 15% walnut shell granules.

Abstract: A composite is a solid material created by combining two or more different substances, each with its own set of qualities, to create a new substance with properties that outperform the original components for a specific use. Currently composite materials are widely applied across various fields due to its superior properties. The fibre reinforced composites being light in weight, and high strength are replacing metals in many applications. Nowadays, more focus is paid in developing sustainable and environment friendly materials without compromise in the quality. This reason led to the development of Natural Fibre Reinforced Composite (NFRC) materials, which is gaining more attention towards them. Though many NFRCs were developed, machining is a very big challenge. Compared to the traditional machining processes, the non-traditional machining process is proved to be recommendable for machining NFRC materials. In this article, the numerous research endeavors carried out in machining of NFRCs using Abrasive Water Jet Machining (AWJM) process is reviewed. This article describes the different parameters considered in AWJM process and their influence over the machining characteristics of NFRCs. Based on the different research carried out, the use of nanofillers in the right composition is expected to increase the performance of the AWJM process over NFRCs.

Abstract: Stress and stress concentration are one of the main factors of invalidating load-bearing structural members. Stress detection becomes an important part of industrial production. Mechanoluminescent (ML), which is produced by mechanical stimulation acting on materials, has been suggested to use in stress detection. This work focuses on the development and mechanism of ML, concludes with the applications of ML on the stress measurement, and discusses the specific challenges to the future directions of ML.