Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 12 of 12 for “"NiTi Shape Memory Alloy"”.
-
Atomistic to Continuum Multiscale and Multiphysics Simulation of NiTi Shape Memory Alloy
Shape memory alloys (SMAs) are materials that show reversible, thermo-elastic, diffusionless, displacive (solid to solid) phase transformation, due to the application of temperature and/ or stress (/strain). Among different SMAs, NiTi is a popular one. NiTi shows reversible phase transformation, …
-
Performance of Steel Braced Frame Reinforced with Shape Memory Alloy Wires
Shape memory alloys have just recently made their way into structural design, and through studies have proved to be quite effective in increasing a structure’s strength and performance. This thesis focuses on the research performed on concentrically braced steel frames reinforced with …
-
Development and experimental validation of self-centering buckling-restrained braces with shape memory alloy
… development of systems that return to their initial position (i.e., “self-center”) following an earthquake and minimize structural damage is a crucial need. The research presented in this thesis aims to address this need by creating an innovative self-centering brace for advanced seismic …
-
Extraction of Superelastic Parameter Values from Instrumented Indentation Data
Interest in superelastic (and shape memory) materials continues to rise, and there is a strong incentive to develop techniques for monitoring of their superelastic characteristics. This is conventionally done via uniaxial testing, but there are many advantages to having a capability for obtaining …
-
Prestressing Concrete with Shape Memory Alloy Fibers
… large, straight members. During the last decade, shape memory alloys (SMA) have become more prevalent in engineering and civil engineering applications. The shape memory effect refers to the contraction of the SMA when it is heated to its austenite phase. When a prestrain is induced in the SMA, it …
-
Nanoindentation of Annealed and As-Sputtered Thin Films of Nickel Titanium Shape Memory Alloys
… of interest for MEMS devices is nickel titanium (NiTi) shape memory alloy (SMA) because of the high work output (~107 J/m3). This thesis will focus on the fabrication of thin film NiTi by DC magnetron sputtering deposition and testing mechanical properties of the fabricated films by …
-
Mechanical counter-pressure space suit design using active materials
… of low spring index (C = 3) nickel titanium (NiTi) shape memory alloy (SMA) coil actuators designed for use in wearable compression garments. Several actuators were manufactured, annealed, and tested to assess their de-twinning and activation characteristics. We then describe the derivation …
-
An advanced perspective on twin growth in nickel-titanium
… the attributes of twinning in Nickel-Titanium (NiTi) shape memory alloy. In particular, atomistic mechanisms of twin growth in two different phases of NiTi are characterized with barrier energy in this thesis. In addition, energetics of dislocation twin boundary interactions in a face centered …
-
Materials selection for microsystems actuators
… subjected to electrothermal, piezoelectric and shape memory actuations. The thermal performance (actuation frequency) was evaluated using lumped heat capacity models. Contours of equal performance were plotted in the domain of governing material properties on Ashby’s selection maps to identify …
-
Tailoring Artificial Muscles for the Design and Development of Soft Underwater Robots
… and coiled polymer fishing line (TCPFL) and NiTi shape memory alloy (SMA) actuators. As compared to current conventional actuators such as stepper motors and pnuematic systems, artificial muscles play a vital role in soft robotics due to their compliance, high strain, light weight, and low …
-
A Comparative Study on Micro Electro-Discharge Machining of Titanium Alloy (TI-6AL-4V) and Shape Memory Alloy (NI-TI)
… that take place during the machining of NiTi SMA and Ti-6Al-4V with micro-EDM. This was done by creating an array of blind holes and micro-patterns on both work-pieces. To analyze the machined surface and investigate the results, scanning electron microscope (SEM), energy dispersive X- …
-
Design, Fabrication, and Characterization of a Thin-Film Nickel-Titanium Shape Memory Alloy Diaphragm for Use in Micro-Electro-Mechanical Systems
… Poly has shown that thin-film nickel-titanium (NiTi) can be easily sputtered onto silicon wafers and annealed to create a crystallized shape memory alloy (SMA) film. Initial work on creating devices yielded cantilevers that were highly warped due to thin-film stress created during the sputtering …