scholarly journals Recent Developments on Shape Memory Applications

1997 ◽  
Vol 07 (C5) ◽  
pp. C5-581-C5-590 ◽  
Author(s):  
P. A. Besselink
Keyword(s):  
Shape Memory ◽  
Recent Developments ◽  
Memory Applications

From a Seed to a Need: the Growth of Shape Memory Applications in Europe.

1991 ◽  
Vol 246 ◽  
Author(s):  
Ir. J. Van Humbeeck
Keyword(s):  
Shape Memory ◽  
Low Cost ◽  
Marketing Research ◽  
Research Approach ◽  
Manufacturing Cost ◽  
Product Price ◽  
Key Factor ◽  
Place Promotion ◽  
Memory Applications ◽  
The Cost

AbstractA more systematic marketing research approach has finally revealed good ideas anticipating a market need for the use of shape memory alloys. The success of those new ideas, prototypes and applications are analysed in terms of “the value of the function”, defined as the importance of the function divided by the cost of providing the function. A high importance and/or a low cost of the function are thus the basic requirements for the successful introduction of shape memory applications. Attention is also paid to the way how the 4 P's, product, price, place, promotion (the marketing mix) are applied by the European companies. Those different items will be illustrated on the basis of some small-, medium- and largescale applications, used in different markets. “to the point research”, fundamental and applied, on material properties as well as on manufacturing (cost reduction) is being discussed as the key factor to increase the function value.

Advances in Precursor Development for CVD of Bariumcontaining Materials

1993 ◽  
Vol 335 ◽  
Author(s):  
Brian A. Vaartstra ◽  
R. A. Gardiner ◽  
D. C. Gordon ◽  
R. L. Ostrander ◽  
A. L. Rheingold
Keyword(s):  
State Of The Art ◽  
Chemical Vapor ◽  
Dielectric Materials ◽  
Barium Strontium ◽  
Barium Compounds ◽  
Recent Developments ◽  
Metal Organic ◽  
High Dielectric Materials ◽  
High Dielectric ◽  
Memory Applications

AbstractBarium titanate and barium-strontium titanate (BST) are high dielectric materials, likely to replace state-of-the-art capacitor materials for memory applications. Chemical Vapor Deposition (CVD) of these materials has been hampered, particularly by the lack of suitable precursors for barium. Although attempts to make volatile metal-organic barium compounds have met with some progress, a suitably stable, volatile barium source is still in demand. This paper will highlight recent developments at ATM, including syntheses and structures of polyamine and glycol ether adducts which have been designed to limit aggregation of barium diketonates, and stabilize the adducts with respect to ligand dissociation.

scholarly journals Shape-Memory Applications in Textile Design

2015 ◽  
Vol 195 ◽  
pp. 2160-2169 ◽  
Author(s):  
Mustafa O. Gök ◽  
Mehmet Z. Bilir ◽  
Banu H. Gürcüm
Keyword(s):  
Shape Memory ◽  
Textile Design ◽  
Memory Applications

Testing Shape Memory of Porous Polymer Tissue Engineering Scaffolds in Compression

2011 ◽  
Author(s):  
Hugh Lippincott ◽  
Daniel F. Schmidt
Keyword(s):  
Tissue Engineering ◽  
Shape Memory ◽  
Test Methods ◽  
The Body ◽  
Porous Polymer ◽  
Small Samples ◽  
Porous Scaffolds ◽  
Tissue Engineering Scaffolds ◽  
Compression Cycle ◽  
Memory Applications

Shape recovery from memory by porous scaffolds for tissue engineering offers easier insertion and self-retention following placement by minimally invasive surgery. Shape memory testing of porous polymer xerogels focuses on the compression cycle and the special aspects of the cycle and equipment used. This contrasts with normal tensile shape memory (SM) testing. In this work a dynamic mechanical analyzer (DMA) was used on small samples to quickly yield measurement of the SM restoration at various stress levels to emulate the forces exerted on the body by a tissue engineering (TE) scaffold returning to its permanent shape. The DMA testing of a hexamethyl diisocyanate trimer crosslinked castor oil (CO) / polycaprolactone (PCL) blend yielded repeated SM with no creep. The porous CO/PCL showed repeated compressive SM at 50% strain with a SM stress-free recovery ratio of 100%. The peak SM recovery work of 6.4 KJ/m3 was measured at 0.5 MPa stress and 6% to 12% strain. In addition to the potential utility of these materials in a tissue engineering setting, the test methods described here are relevant to a broad range of shape memory applications, from medical devices to morphing airframes to self-deploying structures.

Polymethyl methacrylate nanofiber-reinforced epoxy composite for shape-memory applications

2013 ◽  
Vol 25 (8) ◽  
pp. 1000-1006 ◽  
Author(s):  
Prasanna Kumar Iyengar ◽  
Kalambettu Aravind Bhat ◽  
Dharmalingam Sangeetha ◽  
Tindivanam Vallam Moorthy
Keyword(s):  
Shape Memory ◽  
Polymethyl Methacrylate ◽  
Epoxy Composite ◽  
Memory Applications

Recent Developments of Magnetic SMA

2008 ◽  
Vol 59 ◽  
pp. 1-10 ◽  
Author(s):  
Outi Söderberg ◽  
Ilkka Aaltio ◽  
Yan Ling Ge ◽  
Xu Wen Liu ◽  
Simo Pekka Hannula
Keyword(s):  
Magnetic Field ◽  
Phase Transformation ◽  
Shape Memory ◽  
Dimensional Change ◽  
Magnetic Shape Memory ◽  
Dimensional Changes ◽  
Different Types ◽  
Recent Developments ◽  
Giant Magnetocaloric Effect ◽  
The Magnetic Field

In the shape memory alloys (SMAs) the thermal triggering induces reversible dimensional change by the phase transformation – these materials may also be ferrior ferromagnetic, however, here only the ferromagnetic SMAs are discussed. In certain SMAs the austenitemartensite phase transformation is influenced by the magnetic field as either austenite or martensite is promoted by the field and this is exploited for the dimensional changes. However, in the magnetic shape memory (MSM) alloys no phase transformation occurs as the remarkable dimensional changes take place by the twin variant changes in the martensitic phase activated by the external magnetic field at constant temperature. In addition to the phase transformation or magnetic shape memory effect, the applied magnetic field may also result in the conventional magnetostriction (MS), enhance the superelasticity (magneticfieldassisted superelasticity MFAS) or induce the giant magnetocaloric effect (GMCE). Certain alloys such as NiMnGa may even be multifunctional showing more than one of these effects. The present paper gives an overview of the different types of the magnetically activated SMA alloys, their properties as well as their potentials for applications in the frameworks of the recent studies.

Recent Developments in High Temperature Shape Memory Alloys

1994 ◽  
Vol 360 ◽  
Author(s):  
Jeno Beyer ◽  
Jan.H. Mulder
Keyword(s):  
High Temperature ◽  
Research And Development ◽  
Shape Memory Alloys ◽  
Time Dependence ◽  
Shape Memory ◽  
Medical Applications ◽  
Space Technology ◽  
Shape Memory Properties ◽  
Recent Developments ◽  
Number Of Cycles

AbstractThe functional properties of Shape Memory Alloys (SMA's) are used succesfully at present in a variety of industrial and medical applications. The use of these materials in smart structures is now emerging in the field of aeronautic/space technology. Many applications require higher operating temperatures than available to date, or higher cooling rates and/or a higher number of cycles. For this purpose the properties and fabricability of commercial alloys as Ni-Ti-(X), Cu-Al-Ni or Cu-Zn-Al are being adjusted and improved. Other feasible alloys are being developed. The research and development is directed towards the control of the stress, strain, temperature and time dependence of shape memory properties for a stable in-service behaviour. In this paper the various approaches taken up in recent years by academic and industrial laboratories for developing high temperature SMA's are reviewed.

scholarly journals Soft Underwater Robot Actuated by Shape-Memory Alloys “JellyRobcib” for Path Tracking through Fuzzy Visual Control

2020 ◽  
Vol 10 (20) ◽  
pp. 7160
Author(s):  
Christyan Cruz Ulloa ◽  
Silvia Terrile ◽  
Antonio Barrientos
Keyword(s):  
Shape Memory ◽  
Soft Materials ◽  
Visual Control ◽  
Computer Assisted ◽  
Soft Robot ◽  
Recent Developments ◽  
Computational Fluid Dynamics Simulations ◽  
Dynamics Simulations ◽  
Autonomous Movement ◽  
And Behavior

Recent developments in bioinspired technologies combined with the advance of intelligent and soft materials have allowed soft robots to replicate the behavior of different animal species. These devices can perform complicated tasks such as reaching or adapting in constrained and unstructured environments. This article proposes a methodology to develop a soft robot called “JellyRobcib” inspired in morphology and behavior by jellyfish, using shape-memory alloy springs as actuators (as bio-muscles). Such actuators can move the jellyfish both vertically and laterally by applying closed-loop fuzzy and visual controls. Additionally, Computer-Assisted Designs and Computational Fluid Dynamics simulations have been carried out to validate the soft robot model. The results show that the robot movements are very close to the morphological behavior of a real jellyfish regarding the curves of displacements, speeds and accelerations, after performing several experiments for autonomous movement: vertical ascent, lateral movements and trajectory tracking, obtaining an accuracy of ±1479 cm and repeatability of 0.944 for lateral movements for fuzzy visual control. Furthermore, thermal measurements were taken throughout a given path, allowing the generation of temperature gradients within the underwater environment for monitoring purposes.

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