scholarly journals High-Frequency Magnetoimpedance (MI) and Stress-MI in Amorphous Microwires with Different Anisotropies

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1208
Author(s):  
Junaid Alam ◽  
Makhsudsho Nematov ◽  
Nikolay Yudanov ◽  
Svetlana Podgornaya ◽  
Larissa Panina
Keyword(s):  
Tensile Stress ◽  
Flexible Electronics ◽  
Smart Materials ◽  
Calibration Technique ◽  
Microwave Scattering ◽  
Impedance Characteristics ◽  
Potential Applications ◽  
Amorphous Microwires ◽  
Annealed Wire ◽  
Applied Tensile Stress

Magnetoimpedance (MI) in Co-based microwires with an amorphous and partially crystalline state was investigated at elevated frequencies (up to several GHz), with particular attention paid to the influence of tensile stress on the MI behavior, which is called stress-MI. Two mechanisms of MI sensitivity related to the DC magnetization re-orientation and AC permeability dispersion were discussed. Remarkable sensitivity of impedance changes with respect to applied tensile stress at GHz frequencies was obtained in partially crystalline wires subjected to current annealing. Increasing the annealing current enhanced the axial easy anisotropy of a magnetoelastic origin, which made it possible to increase the frequency of large stress-MI: for 90mA-annealed wire, the impedance at 2 GHz increased by about 300% when a stress of 450 MPa was applied. Potential applications included sensing elements in stretchable substrates for flexible electronics, wireless sensors, and tunable smart materials. For reliable microwave measurements, an improved SOLT (short-open-load-thru) calibration technique was developed that required specially designed strip cells as wire holders. The method made it possible to precisely measure the impedance characteristics of individual wires, which can be further employed to characterize the microwave scattering at wire inclusions used as composites fillers.

Influence of applied tensile stress on the magnetic behaviour of Co-rich amorphous microwires

2009 ◽  
Vol 206 (4) ◽  
pp. 625-629 ◽  
Author(s):  
S. A. Gudoshnikov ◽  
B. Ya. Ljubimov ◽  
P. S. Palvanov ◽  
Yu. V. Prokhorova ◽  
V. S. Skomarovski ◽  
...  
Keyword(s):  
Tensile Stress ◽  
Magnetic Behaviour ◽  
Amorphous Microwires ◽  
Applied Tensile Stress

The Mechanics of Ozone Cracking

1962 ◽  
Vol 35 (1) ◽  
pp. 200-209 ◽  
Author(s):  
M. Braden ◽  
A. N. Gent
Keyword(s):  
Tensile Stress ◽  
Crack Growth ◽  
Energy Requirement ◽  
Critical Energy ◽  
Critical Value ◽  
Experimental Measurements ◽  
Rubber Sheet ◽  
Polymer Molecules ◽  
Two Factors ◽  
Applied Tensile Stress

Abstract Experimental measurements are described of the growth of a cut in a stretched rubber sheet under the action of an atmosphere containing ozone. A well-defined rate of crack growth is obtained, substantially independent of the applied tensile stress when this exceeds a critical value necessary for growth to occur at all. The rate of growth is found to be similar for a number of polymers and principally determined by the ozone concentration when the mobility of the polymer molecules is sufficiently high. When the molecular mobility is inadequate, crack growth is retarded. The critical condition is found to be similar for all the polymers examined, and largely independent of the conditions of exposure; it appears to reflect an energy requirement for growth of about 40 ergs/cm2 of newly-formed surface. The effect of the degree of vulcanization and the presence of additives, including antiozonants, on these two factors has also been examined. The dialkyl-p-phenylene diamines are found to confer protection by raising the critical energy required for growth to occur, in contrast to other protective agents which affect only the rate of crack propagation.

scholarly journals Effect of Applied Tensile Stress on the Transformation Behavior of Medium Carbon Low Alloy Steels

1991 ◽  
Vol 77 (6) ◽  
pp. 816-823
Author(s):  
Yutaka KANETSUKI ◽  
Osamu KAIDA ◽  
Masato KAISO ◽  
Masaaki KATSUMATA
Keyword(s):  
Tensile Stress ◽  
Low Alloy Steels ◽  
Transformation Behavior ◽  
Medium Carbon ◽  
Alloy Steels ◽  
Applied Tensile Stress

Novel Behavior in Smart Polymeric Materials: Stress Memory and its Potential Applications

2016 ◽  
Vol 97 ◽  
pp. 93-99
Author(s):  
Jin Lian Hu ◽  
Harishkumar Narayana
Keyword(s):  
Magnetic Field ◽  
Shape Memory ◽  
Smart Materials ◽  
Shape Memory Polymers ◽  
Polymeric Materials ◽  
External Stimulus ◽  
Artificial Muscles ◽  
Recovery Stress ◽  
Stress Memory ◽  
Potential Applications

Materials, structures and systems, responsive to an external stimulus are smart and adaptive to our human demands. Among smart materials, polymers with shape memory effect are at the forefront of research leading to comprehensive publications and wide applications. In this paper, we extend the concept of shape memory polymers to stress memory ones, which have been discovered recently. Like shape memory, stress memory represents a phenomenon where the stress in a polymer can be programmed, stored and retrieved reversibly with an external stimulus such as temperature and magnetic field. Stress memory may be mistaken as the recovery stress which was studied quite broadly. Our further investigation also reveals that stress memory is quite different from recovery stress containing multi-components including elastic and viscoelastic forces in addition to possible memory stress. Stress memory could be used into applications such as sensors, pressure garments, massage devices, electronic skins and artificial muscles. The current revelation of stress memory potentials is emanated from an authentic application of memory fibres, films, and foams in the smart compression devices for the management of chronic and therapeutic disorders.

Effect of Electron Beam Irradiation on the Rheological Properties and Phase Transition Temperature of Poly(N-Vinylcaprolactam)

2020 ◽  
Vol 865 ◽  
pp. 19-24
Author(s):  
Shane C. Halligan ◽  
Kieran A. Murray ◽  
Olivier Vrain ◽  
John G. Lyons ◽  
Luke M. Geever
Keyword(s):  
Phase Transition ◽  
Electron Beam ◽  
Rheological Properties ◽  
Smart Materials ◽  
Electron Beam Irradiation ◽  
Beam Irradiation ◽  
Beam Radiation ◽  
Rheological Analysis ◽  
Novel Approach ◽  
Potential Applications

Exposing smart materials to electron beam radiation can induce free radical reactions, such as chain branching or crosslinking, hence enhancing the characteristics of the polymers. Poly (N-vinylcaprolactam) (PNVCL) is a smart material which was synthesised by photopolymerisation. Subsequently, samples were exposed to electron beam technology, where electron beam irradiation was utilised in a novel approach. This led to the modification of the rheological and phase transition properties. Modifying PNVCL through electron beam irradiation opens new avenues and potential applications in the biomedical field. Physically cross-linked PNVCL polymers were prepared by photopolymerisation and samples were subsequently irradiated at different dose ranges (5kGy, 25kGy and 50 kGy). The rheological properties of the PNVCL based samples were established by rheological analysis. Similarly, the PNVCL based sample polymers were further characterised in solution to determine the phase transition of PNVCL.

Potential Applications of Smart Multifunctional Wearable Materials to Gerontology

Gerontology ◽  
2017 ◽  
Vol 63 (3) ◽  
pp. 287-298 ◽  
Author(s):  
David G. Armstrong ◽  
Bijan Najafi ◽  
Mohsen Shahinpoor
Keyword(s):  
Older Adults ◽  
Smart Materials ◽  
Health Care Services ◽  
Fall Detection ◽  
Well Being ◽  
Personalized Care ◽  
Wearable Technologies ◽  
Care Services ◽  
Potential Applications ◽  
Health Related

Smart multifunctional materials can play a constructive role in addressing some very important aging-related issues. Aging affects the ability of older adults to continue to live safely and economically in their own residences for as long as possible. Thus, there will be a greater need for preventive, acute, rehabilitative, and long-term health care services for older adults as well as a need for tools to enable them to function independently during daily activities. The objective of this paper is, thus, to present a comprehensive review of some potential smart materials and their areas of applications to gerontology. Thus, brief descriptions of various currently available multifunctional smart materials and their possible applications to aging-related problems are presented. It is concluded that some of the most important applications to geriatrics may be in various sensing scenarios to collect health-related feedback or information and provide personalized care. Further described are the applications of wearable technologies to aging-related needs, including devices for home rehabilitation, remote monitoring, social well-being, frailty monitoring, monitoring of diabetes and wound healing and fall detection or prediction. It is also concluded that wearable technologies, when combined with an appropriate application and with appropriate feedback, may help improve activities and functions of older patients with chronic diseases. Finally, it is noted that methods developed to measure what one collectively manages in this population may provide a foundation to establish new definitions of quality of life.

Magnetoelastic behaviour of amorphous ferromagnetic ribbons in response to an applied tensile stress

1984 ◽  
Vol 4 (2) ◽  
pp. 219-228 ◽  
Author(s):  
L. Lanotte ◽  
C. Luponio ◽  
F. Porreca
Keyword(s):  
Tensile Stress ◽  
Applied Tensile Stress

Stimulation and reinforcement of shape-memory polymers and their composites: A review

2020 ◽  
pp. 089270572093077
Author(s):  
Ammar Boudjellal ◽  
Djalal Trache ◽  
Kamel Khimeche ◽  
Said Lotfi Hafsaoui ◽  
Ahmed Bougamra ◽  
...  
Keyword(s):  
Shape Memory ◽  
Memory Effect ◽  
Smart Materials ◽  
Shape Memory Polymers ◽  
Variable Stiffness ◽  
External Stimulus ◽  
Potential Applications ◽  
Thermal Light ◽  
The Common ◽  
One And Many

Shape-memory polymers (SMPs) and their composites (SMPCs), as a kind of smart materials, can respond to particular external stimulus and recover the original shape. They present outstanding features encompassing shape-memory effect, deformability, biocompatibility, variable stiffness, lightweight, and so on. They have attracted considerable research interest in recent years. Several stimulation methods to actuate the deformation of SMPs and SMPCs, of which the thermal stimulation is the common one, and many types of reinforcements have been developed over the past few years. It is revealed that the SMPC thermal and mechanical properties can be improved by introducing a number of reinforcements. Therefore, to well investigate the SMPC characteristics upon exposure to a specific external stimulus, a deep knowledge and understanding of the potential reinforcements as well as the available stimulation methods are crucial. In this review, reinforcements such as fibers, ceramics, and nanocarbons are first concisely presented. Next, numerous novel stimulation methods used to trigger the memory effect of the SMPCs are introduced, where the mechanisms of electrical, magnetic, thermal, light, and solution stimulations are briefly discussed. Finally, considering the increase of the number of interesting reinforcements as well as the efficient stimulation methods, SMPCs are expected to have great potential applications in different fields.

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