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 19 of 19 for “"morphing structures"”.
-
Shape morphing structures via intercalation compounds
… high-strain application, including shape-morphing helicopter blades, boat hulls, satellites, and any other structure that benefits from shape change. An analysis is performed on the state of the technology, the intellectual property held, and the potential markets that exist. A …
-
Strain-based Topology Optimization of a 2D Morphing Transitional Surface
Morphing aircraft offer many benefits. However, the design of stiff yet flexible structures still provides many obstacles to fully exploring and realizing morphing structures. Due to this, many morphing challenges remain open. Topology optimization is a type of structural optimization that …
-
Use of Piezoelectric Actuators to Effect Snap-Through Behavior of Unsymmetric Composite Laminates
As a new concept for morphing structures, the use of piezoelectric actuators to effect snap-through behavior of simple unsymmetric cross-ply composite laminates is examined. Many unsymmetric laminates have more than one stable room-temperature shape and can be snapped through from one stable shape …
-
At the Intersection of Bistability and Elastic Instability: Switching and Locking Structures using Asymmetric Carbon Fiber Composites
The next evolution of engineered structures would be to have an on-demand ability to become soft and foldable for packing in compact dimensions. This adaptive capability makes them convenient in transportation such as space structures where packaging of large deployable structures is crucial that …
-
The design of adaptive structures for wing morphing
… is concerned with the design of adaptive structures for achieving global multi-shape morphing aerodynamic configurations, by using slender structures. The proposed methodologies pursue two threads towards global optimisation of morphing structures, by providing means of aerodynamic …
-
Additively Manufactured Dielectric Elastomer Actuators: Development and Performance Enhancement
… and actively growing areas of soft robotics and morphing structures promise endless opportunities in a wide range of engineering fields, including biomedical, industrial, and aerospace. Soft actuators and sensors are essential components of any soft robot or morphing structure. Among the utilized …
-
Between rigid and soft robotics : discrete assembly of heterogeneous cellular structures
… to discretely assemble lightweight, cellular structures with spatially programmable anisotropy. This bridges the gap between soft and hard robotics, allowing robots to exhibit both soft and hard characteristics. Starting at the basic building block, this thesis will describe going from 0D to …
-
Fatigue Characteristics of Pressurized Artificial Muscles
… standard aircraft actuation operations and in morphing structures as an alternative to currently used actuation systems due to their high power-to-weight ratio. Pressurized artificial muscles have already demonstrated the necessary force production to be utilized as an alternative actuation …
-
Characterization of Bistability Behavior in Unsymmetric CFRP Laminates
… been suggested for applications in aerospace morphing structures, damping, and energy storage, because of their ability to easily change their shape while being homogenized with the rest of the composite structure.</p> <p>This study analyzes the mechanisms responsible for bistability in …
-
Modulation Of Hydrodynamic Forces On Oscillating Submerged Structures In Viscous Fluids
… behavior of flexible submerged cantilever-like structures subjected to underwater vibration is of primary importance in a wide range of scientific and engineering fields. In the context of such applications, the performance of submerged devices primarily depends on the hydrodynamic forces …
-
Development and validation of thermo-mechanically coupled finite elements for the simulation of the nonlinear time response of multi-layered shape memory alloy beams
… the simulation of the transient response of beam structures which admit various layers of SMA and passive materials. Initially the formulation of a geometrically linear beam FE is presented while subsequently a second formulation is presented, suitable for the simulation of structures which admits …
-
The Effect of Nanoconfined Liquid Properties on the Water-Responsive Behavior of Bacterial Cell Walls
… including energy harvesting, robotics, and morphing structures. However, the fundamental mechanisms of WR actuation are still poorly understood. Despite the unclear WR mechanism, recent studies have provided compelling evidence of the critical role that the properties of nanoconfined water …
-
Functional kirigami by exploiting elastic instabilities
Shape-morphing structures change their configurations in response to environmental stimuli. Their structural properties may also change as a consequence of the reconfiguration of their geometry and topology. Such reconfigurable structures are highly desired for their engineering functionalities in …
-
Hierarchical design of morphing shape-memory polymer structures via topology optimization
… framework for systematic design of shape morphing structures capable of exhibiting large deformations with SMPs. A hierarchical two-stage design procedure is adopted. In the first stage, basic unit structures including a twisting structure and a bending structure are designed using a …
-
Rapid fabrication of polymers and composites via frontal polymerization
… to facilitate applications such as shape-fixing, morphing structures, surface patterning, 3D-printing, and rapid vascularization. Before applying the FROMP chemistry to a composite, we developed a model system to understand the effects of the reinforcing fibers on the reaction. Herein, we showed …
-
Multistable Shell Structures
Multistable structures, which possess by definition more than one stable equilibrium configuration, are capable of adapting their shape to changing loading or environmental conditions and can further improve multi-purpose ultra-lightweight designs. Whilst multiple methods to create bistable shells …
-
Passive biomimetic actuators : the role of material architecture
… Therefore the potential of these pressurized structures as soft actuators is outlined. This approach was extended by considering several 2D cellular solids based on two types of non-convex cells. Each honeycomb is build as a lattice made of only one non-convex cell. Compared to usual …
-
Active fibre-reinforced composites with embedded shape memory alloys
… of active materials allows to develop adaptive structures which actively respond to changes in the environment, such as morphing structures, self-healing structures and power harvesting devices. In particular, shape memory alloy actuators integrated within a composite actively control the …
-
Design of a morphing airfoil exhibiting bi-stability using topology optimization
… aims to harness the geometric non-linearity of structures to design a novel camber morphing mechanism for a bi-stable airfoil using topology optimization. The goal is to use snap-through instabilities to actuate and maintain the shape of the morphing airfoil. Topology optimization has been used …