No full-text available
To read the full-text of this research,
you can request a copy directly from the author.
Smart materials and structures. ByM. V. Gandhi andB. S. Thompson, Chapman and Hall, London 1992, 310 pp., hardback, ISBN 0-412-37010-7
Advanced Materials
... Since the strain and stress created by the SME are extremely large as compared to those created in magnetostrictive and piezoelectric materials, SMA s are potential candidates for actuators, for example, motors and supersonic oscillators. Be that as it may, since the output actuation in SMA s happens through temperature change for an input signal, it is difficult to get a fast response to the input signal at frequencies high than 5 Hz, because the thermal conductivity of the alloys is a rate determining factor of the response [12]. This fatal drawback limits the use of SMA s as actuators. ...
The use of magnetic shape memory alloys (MSMAs) in manufacturing industry has increased significantly in recent years. This is mainly due to their great interest in their potential applications in smart devices, because of the reversible distortions suffered. The well-known example of these combinations is the Heusler type. A review is given of experimental works concerning the examination of magnetic field, structural phase transitions, and the magnetocaloric impact in Heusler Ni–Mn–X (X = In, Sn, Sb) and Ni–Co–Mn–Y (Y = In, Sn, Sb) alloys. This type of compounds has excellent properties, for example, the presence of coupled magnetostructural (coïncident magnetic and martensitic transitions) and metamagnetostructural phase transitions (coïncident metamagnetic (ferromagnetic-antiferromagnetic) and martensitic transitions), the magnetocaloric impact (MC), and the large magnetoresistance change (MR). The conceivable difficulties and remaining problems are briefly discussed.
This paper analyzes and explores how the fifth Industrial Revolution (Industry 5.0) can help manufacturing industry systems. With the help of upcoming advanced technologies, these industries can have a smooth transition from conventional to digital systems. Industry 5.0 technologies are assumed to provide better connectivity through the internet of everything. The paper outlines the features and major technologies of Industry 5.0 and the concept of mass personalization. Further, it identifies various manufacturing industries’ challenges and how these components can solve their problems. This paper gives us an advanced overview of these industries’ future manufacturing industries and future skills. Industry 5.0 brings back humans working alongside robots in the manufacturing process and increases collaboration between humans and robots.
A simple and straightforward approach to produce solvent and vapor-based actuating materials is developed in this work. These actuators are based on rigidity gradient obtained in bilayer architectures made of reversibly cross-linked poly(ε-caprolactone) (PCL) networks wherein functional nanofillers, i.e. multi-walled carbon nanotubes (MWCNTs), are incorporated using simple processing techniques. The key element of the bilayerlays down by taking advantage of thermo-reversible Diels-Alder reactions (between furfuryl and maleimide moieties), ensuring a good adhesion between the layers. Thereby, the produced material instantaneously swells in an anisotropic way due to the rigidity gradient, resulting in fast and reproducible bending actuations. Besides, it is shown that the percolating network of electrically conductive MWCNTs offers the possibility to implement these bilayers as solvent detector sensors. This open the door to the development of multi-responsive devices with tunable actuating behaviors and potential application in the robotics field as self-deployable structures in different environment (water, organic solvents, etc.).
Most research on magnetorheological elastomer (MRE) composites is focused on achieving the best magnetic and magnetorheological properties of composites. Less attention is paid to obtain adequate strength properties. The aim of this study was to receive MRE composites with the best mechanical characteristics. Thermoplastic ethylene–octene rubber composites, filled with different magnetoactive particles were reported. The use of extrusion method instead of traditional preparation processes (two-roll mill, mixer) of composites was also presented. Ferromagnetics: micro- and nano-sized iron oxides, as well as gamma iron oxide and carbonyl iron powder were found to be an active fillers improving both mechanical and magnetic properties of rubber. Application of extrusion process affected mechanical properties of MRE composites and the dispersion of magnetic fillers. Dynamic mechanical analysis (DMA) indicates the presence of strongly developed secondary structure in vulcanizates. Studies investigated by vibration sample magnetometer (VSM) proved that all composites exhibit adequate magnetic properties, predispose them for plenty of applications with the most promising being nowadays tunable vibration absorbers. POLYM. ENG. SCI., 2016.
The project activity presides over the choice of materials and technical capacity within two dimensions of action: the previous knowledge and the tension about the future. That allowed us to identify the succession of the "technological and material" paradigms that have come and gone, featuring the project with the arrival of new materials and production processes. The advent of composite smart materials has challenged all the materials overturning the features.
By depositing layers composed of poly (N-isopropylacrylamide)-based microgels and the polyelectrolyte polydiallyldimethylammonium chloride on a flexible substrate, responsive materials that bend upon drying can be fabricated; the extent of the bending depends on atmospheric humidity. This study shows that the bending conformation/direction can be templated, and exhibits shape memory. Detailed examination of the bilayer system leads to an understanding of the phenomena leading to this behavior. By close examination of microscopy images and diffraction patterns, this study is able to determine that the dried polymer-based layer is composed of both amorphous and crystalline phases; the amorphous phase can readily absorb water, which results in actuation, while the crystalline phases template the bending characteristics of the device. With an understanding of the bending behavior of the devices, this study is able to generate humidity sensors by interfacing them with stretchable strain sensors, which are also developed specifically for the bendable materials.
Workshop on Smart/Intelligent Materials and Systems
- Us-Japan