An innovative fatigue strengthening solution for metallic structures that takes advantage of the shape memory effect an iron-based alloy (Fe-SMA) and bridging mechanism offered by bonding technique has been proposed examined. Fatigue tests on cracked steel plates with bonded carbon fiber-reinforced polymer (CFRP) nonprestressed prestressed Fe-SMA strips were conducted. The experimental results ...

Persons with blindness access computers with the help of refreshable Braille displays and speech synthesis softwares. Braille has distinguished advantages over synthetic speech, especially because of its important role in uplifting education, employment and income. However, commercially available Braille displays are typically priced in the range of 2500-4000 USD (65-100 USD per Braille charact...

This paper presents the results from an experimental study on the actuation response of composite laminates containing Shape-Memory Alloy (SMA) actuators. Unidirectional glassfibre reinforced epoxide laminates were constructed containing Ni-Ti SMA actuators orientated parallel to the glass-fibre direction. The volume fraction of actuator was varied in the range 0 to 2.5 ~ 0 1 % . These laminate...

In order to realize the reliable unlocking of solar arrays a CubeSat under strict constraints space and power dissipation, shape memory alloy(SMA) wire linear actuation mechanism is developed. Through using spring-SMA structure, relying on spring force locking, heating SMA producing recovery stress drive pin movement, are unlocked. The mathematical model established, relationship among stroke, ...

Acknowledgements There are many who have made contributions, both directly and indirectly to the completion of this thesis. I would like to name a few. First of all, I would like to sincerely thank my supervisor, Dr. Roy Featherstone, whose help has been enormous and whose enthusiasm has sparked my own in this wonderful work. His ideas and suggestions had frequently created jigsaw puzzles with ...

in the present research, in contrast to the available papers, not only the superelasticity but also the shape memory effects are taken into account in determination of the impact responses. at the same time, in addition to modifying brinson’s model for the shape memory alloys (smas), to include new parameters and loading events, and hertz contact law, distributions of the sma phases are conside...

The ability to actively control the shape of aerospace structures has initiated research regarding the use of Shape Memory Alloy actuators. These actuators can be used for morphing or shape change by controlling their temperature, which is effectively done by applying a voltage difference across their length. The ability to characterize this temperature-strain relationship using Reinforcement L...

In this study, based on designed Ti-50Ni, Ti-27Ni-23Nb, and Ti-27Ni-19Nb-4X (Ta V) SMAs were prepared using arc melting. The microhardness microstructure of the alloys examined. optical microscope (OM) Scanning Electron Microscopy (SEM) images can be noted that Nb, Ta, V addition in substitution to nickel causes a change morphology TiNi Shape Memory Alloy at room temperature. results shown when...

A hybrid damper concept is presented here using a combination of Magnetorheological (MR) Fluid (MRF) and Shape Memory Alloy (SMA)-based energy dissipation. demonstration performed utilizing the shear operating mode MRF one-way effect SMA. The damping performance different MRF-SMA configurations investigated corresponding consumption evaluated. We demonstrate that operation SMA dampers complemen...

Pseudoelasticity and the shape memory e ect (SME) due to martensitic transformation and reorientation of polycrystalline shape memory alloy (SMA) materials are modelled using a free energy function and a dissipation potential. Three di erent cases are considered, based on the number of internal state variables in the free energy: (1) Austenite plus a variable number of martensite variants; (2) ...