Current global scenario of sputtered deposited NiTi smart systems

This review provides details of the global scenario on the recent development and application of NiTi smart metal shape memory alloys (SMA). It mainly focuses on the dc/rf magnetron sputtering fabrication technology of nitinol thin film, which is a prominent structural material for many miniaturised systems. The sputtering parameters and their influence on the smart mechanism of the NiTi thin film has highlighted. The application of NiTi SMA at industrial scale from aviation industries to medical industries was discussed. The raised challenges within various applications were addressed, discussed and we have proposed possible way to overcome these limitations

Revealing the benefits of Entropy weights method for multi-objective optimization in machining operations : a critical review

Machining operation optimization improves the quality of the product, reduces cost, enhances overall efficiency by reducing human error, and enables consistent and efficient operation. It is a vital decision-making process and achieves the best solution within constraints. It reduces reliance on machine-tool technicians and handbooks to identify cutting parameters, as a lack of awareness of the optimal combination of machining parameters leads to several machining inefficiencies. Subsequently, the optimization of the machining process is more useful for units of production, particularly machining units. In multi-objective optimization (MOO) problems, weights of importance are assigned, mostly identical. But, nowadays, the weights assignment techniques have received a lot of consideration from the professionals and researchers in MOO problems. Various techniques are developed to assign weights of significance to responses in MOO. The Entropy weights method (EWM) continues to work pleasingly across diverse machining operations to allocate objective weights. In this paper, a literature review is conducted to classify the articles on EWM applications in machining operations. The categorization proposal for the EWM reviews included 65 academic articles from different journals, books, and conferences since the year 2009. The EWM applications were separated into 18 categories of conventional and non-conventional machining operations. The implementation procedure of EWM is presented with an example along with method development. Scholarly articles in the EWM applications are further inferred based on (1) implementation of EWM in different machining operations, (2) MOO methods used with entropy weights in machining operations, (3) application of entropy weights by citation index and publication year, and (4) entropy weights applications in other fields. The review paper provided constructive insight into the EWM applications and ended with suggestions for further research in machining and different areas

Some Properties of Motion Equations Describing the Nonlinear Dynamical Response of a Multibody System with Flexible Elements

The industrial applications use instruments and machines operating at high speeds, developing high forces, low temperatures, corrosive environments, extreme pressures, and so forth. Under these conditions, the elasticity of elements such a machine is built of cannot be ignored anymore, and models are needed to more accurately “grasp” the mechanical phenomena accompanying the operation. The vibrations and the loss of stability are the main effects occurring under these conditions. For the study on this kind of systems with rigid motion and elastic elements, numerous models have been elaborated, the main idea being the discretization of the elements and the use of finite element method. Finally, second-order differential equations with variable coefficients are obtained; these equations are strong nonlinear ones due to the time-dependent values of angular speed and acceleration, and they can be linearized considering a very short period of time, in which the motion is considered to be “frozen.” The aim of this paper is to present some characteristic properties of these systems

THE OPTIMAL DESIGN OF THE TESTING SPECIMENS FOR A MORE ACCURATE EVALUATION OF THE GLUES’ MECHANICAL PROPERTIES

The main goal of the contribution consists in offering an improved method in the glues’ mechanical behaviours estimation, involving also a new type of specimen. The described method can be used successfully not only in the wood industry, but also in several other industrial applications, where the adhesives’ mechanical properties have to be determined as much as accurate possible. The authors elaborated the below-proposed method, based on their former, high-accuracy investigations by means of Holographic Interferometry, where were evaluated not only the timedependent behaviours of the glues (evaluated by means of their displacements field), but also their residual behaviours, too. The original testing bench of the authors allows a wide range of stresses, out of which, this paper describes only the longitudinal shear one. The proposed testing specimen, analysed by means of FEM method, will eliminate totally the undesired bending effect, which produces the so-called peel stress. The authors express their hope that the proposed strategy will became an useful, objective and high-efficiency modality both for testing and choosing the most adequate glue (not only for wood-industry, but also for the general industrial purpose, too)