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 20 of 45 for “"shape memory alloy (SMA)"”.
-
Investigation of Residual Stresses in Shape Memory Alloy (Sma) Composites
… concentric cylinder micromechanics model and an SMA composite thermoelastic beam theory were developed to analyze the micromechanical and structural-level thermal and transformational stresses for nitinol composites induced by nitinol wires embedded in a host matrix. A series of warpage …
-
Development and Characterization of a Self-Stressing Shape Memory Alloy (SMA)-Fiber Reinforced Polymers (FRP) Composite Patch for Repair of Cracked Steel Structures
… applications. In this research a self-stressing shape memory alloy (SMA)-fiber reinforced polymer patch is presented that can be used to prestress civil infrastructure, with a target application of repairing cracked steel structures. The self-stressing patch consists of nickel titanium niobium …
-
Impact Damage Resistance of Shape Memory Alloy Hybrid Composite Structures
The strain energy absorption of shape memory alloy (SMA) bars and beams under tension and bending loading was studied. A theoretical model is presented that can give quantitative relations between the martensite fraction, the applied load, and the strain energy absorbed in the shape memory alloy …
-
Structural acoustic analysis of shape memory alloy hybrid composite panels
Shape memory alloy (SMA) hybrid adaptive composites are a class of materials which combine the strain recovery and elastic properties transformation capabilities of SMA fibers with the structural characteristics of advanced composite materials. This study utilizes the Rayleigh-Ritz method and …
-
Design of a Shape Memory Alloy Coil Actuated Robotic Finger with Compliant Joint Antagonists
… finger with compliant joints actuated by shape memory alloy (SMA) coils. This work presents the design, manufacturing, and characterization of the compliant finger mechanism, the SMA coil actuators, and an integrated prototype from analytical and experimental methods. The compliant finger …
-
Using shape memory alloy as dampers : design methodology
Many shape memory alloy (SMA) material models have been proposed in the literature, but most are suited only to forward analysis and not to design. This project proposes a generalized friction element, the lambda box, to model the stress-strain curve of SMA during pseudoelasticity. Simulation is …
-
The Characterization and Control of Shape Memory Alloy Cables for Reinforcement of Engineered Cementitious Composite Beams
… composite (ECC) beams using superelastic Nitinol shape memory alloy (SMA) cables. Nitinol is the most popularly used SMA and superelastic Nitinol cable possesses many attractive features, such as large recoverable strain, large load bearing capacity, among others. To understand the characteristics …
-
A novel binary actuator using shape memory alloy
… of the martensitic transformation of Nitinol, a Shape Memory Alloy (SMA), to generate the actuation force. A compliant bistable mechanism provides the restoring force that pre- strains the martensitic Nitinol, and thus makes the actuator binary. Binary actuation alleviates some of the problems …
-
Sensorless temperature estimation and control of Peltier devices
… sense and control the temperature of a shape memory alloy (SMA) wire. The pulse width-modulating driving circuitry in the controller is capable of measuring the undriven voltage across the TED at a rate of 200 Hz between pulses. A low order ARX model is then used to estimate the SMA …
-
Development of a control system for a SMA actuated medical manipulator
… to be accomplished with actuators made of Shape Memory Alloy (SMA). SMA has the ability to recover permanent deformation by undergoing a phase transformation. The recovery of the deformation results in motion of the SMA material which can be exploited for useful work. SMA was chosen as the …
-
Issues in the design of shape memory alloy actuators
This thesis considers the application of shape memory alloy (SMA) actuators for shape control of the undertray of a sports car. By deforming the shape of the structure that provides aerodynamic stability to the car, we expect to improve the overall performance of the vehicle by adapting its …
-
The design of a hybrid DC motor/SMA actuated robotic hand based on physiological and anatomical synergies
… of multi-fingered hands using hybrid DC motor-Shape Memory Alloy (SMA) array actuators is presented in this thesis. The fundamental design concept is based on the principle of motor control synergy, a biomechanics terminology for coordinated motion generation. Principal component analysis is …
-
Advancing Architecture through Shape Memory Alloy Actuators
This thesis explores the integration of Shape Memory Alloy (SMA) actuators into architectural design, proposing a comprehensive knowledge framework that bridges material science, responsive technologies, and architectural theory. Motivated by the ontological and experiential implications of kinetic …
-
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 …
-
Design of an electronically-actuated gas lift safety valve
… system that builds on a prior invention based on shape-memory alloy, but, among other features, can handle the slowly changing temperature conditions downhole. The newly-designed control circuit is integrated into the original shape memory alloy (SMA) scheme. The selection criteria and features of …
-
Heat Engine Driven by Shape Memory Alloys: Prototyping and Design
This work presents a novel approach to arranging shape memory alloy (SMA) wires into a functional heat engine. Significant contributions include the design itself, a preliminary analytical model and the realization of a research prototype; thereby, laying a foundation from which to base refinements …
-
A rotary shape memory alloy actuator for CubeSat deployable structures
… deployable structures. We propose using a shape memory alloy (SMA) actuator to meet this need. A SMA can be annealed at high temperatures to remember a trained shape. Upon cool down, the SMA element transforms to the martensite phase and is easily deformed. When the element is heated above …
-
Segmented binary control of shape memory actuator systems
A new approach to the design and control of shape memory alloy (SMA) actuators is presented. SMA wires are divided into many segments and their thermal states are controlled individually as a group of finite state machines. Instead of driving a current to the entire SMA wire and controlling the …
-
Ballistic Impact Resistance of Graphite Epoxy Composites With Shape Memory Alloy and Extended Chain Polyethylene Spectra™ Hybrid Components
… strength reduction. The effect of adding small amounts of two types of high strain hybrid components on the impact resistance of graphite epoxy composites subjected to projectiles traveling at ballistic velocities (greater than 900 ft/sec) has been studied. The hybrid components tested …
-
PROCESSING AND CHARACTERIZATION OF TINI-BASED ALLOYS FABRICATED BY LASER AIDED MANUFACTURING
… parts. Apart from manufacturing traditional alloys, DED can also be used to develop advanced alloys with the novel idea of elemental powder mixture feedstock. TiNi-based alloy is a type of shape memory alloy (SMA), a smart material with unique shape memory effects. Using laser powder DED to …
Page 1 of 3