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.
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Showing 1 to 18 of 18 for “"Architected Materials"”.
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Machine learning methods for architected materials
Architected materials have a lot of promise for structural and functional applications such as lightweight structures for blast protection, efficient heat exchangers, or battery electrodes with large specific surface area. They have an intricate microstructure which is a feature that makes them …
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Design of Kresling inspired architected materials by using Polyjet technique
… characteristics of 3D printed PJ Kresling architected materials, such as tunable energy absorption and multi-stable states. Initially, a quantitative review of the achieved mechanical performance of PJ architected materials in the context of Ashby charts was developed. Subsequently, the …
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Multi-Layered Randomized Architected Materials (MLRAM) as damage detection indicators for tensegrity structures
… accelerating research in the field of architected materials and metamaterials. This dissertation introduces a new type of architected material inspired by polymeric structures and explores two central research themes. The first is whether data-driven models can accurately and …
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Acoustic Metamaterials at the Microscale
Micro-architected materials allow for tunability of extreme static mechanical properties such as stiffness, Poisson’s ratio, or strength. However, dynamic and acoustic properties of micro-architected materials remain largely unexplored, partially because it is challenging to measure their response …
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As global ambient temperatures continue to rise, with the highest recorded annual averages since 1850 being within the last ten years, problems emerge for species exhibiting temperature-dependent sex determination. This is the process by which the sex of an animal’s embryo is determined based on the temperature of environment in which it is incubated, which can result in skewed sex ratios within a population like in the case of the critically endangered Hawksbill Sea Turtles (Eretmochelys imbricata). Reportedly, 85-95% of Hawksbills sampled in the wild are currently female [3]. This sex-imbalance can negatively impact the species’ ability to procreate, leading to the potential for extinction. Currently, no viable, long-term solutions exist to effectively and safely cool sea turtle eggs while still keeping them within their natural habitat. This research proposes the creation of sea turtle egg incubators designed to achieve a temperature range that will produce a higher percentage of male hatchlings to help rectify this imbalance in habitats heavily affected by climate change. These incubators are designed to be affordable, easy to build and, most importantly, safe for the sea turtle eggs. Three-month-long temperature trials for the incubator were conducted in Jamaica with conservationist community partners at Oracabessa Bay Sea Turtle Project. Results showed that this incubator is not only easy to manufacture and use, but that it successfully regulates the temperature range in favor of more male hatchlings, while also increasing the emergence rate of the hatchlings from 70% in natural nests to over 80%. During one of the hottest months in Jamaica, the incubator, deployed without water changes, doubled the predicted percentage of males produced by natural nests. When provided with cool water changes the incubator quintupled this value. Throughout the months of August to October, the incubator achieved a temperature range that is predicted to produce 85-99% male hatchlings, thus counteracting the feminization phenomenon occurring in nature.
… gear, and medical implants, are versatile materials but mechanically inefficient due to their bending-dominated microstructure, leading to an exponential loss of stiffness and strength at low relative densities. Architected materials address this limitation through engineered …
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Vision-based Proprioceptive and Force Sensing for Soft Robotic Actuator
… pose many performance limitations, and available materials and manufacturing techniques complicate the design of sensorized soft robots. To address these needs, we introduce a vision-based method to sensorize robust, electrically-driven soft robotic actuators constructed from a new class of …
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Tension Activated Kirigami Structures for Interlayer Use in Circular Construction Applications
Motivated by the use of fully circular materials and improving sustainability, this thesis investigates the use of tension-activated kirigami as an architected material, for which mechanical properties are determined by their designed structure (geometry) rather than the bulk material itself. These …
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Tailored Mechanical Response of 3D Microgranular Crystals with Hierarchical Architecture
… unattainable in conventional monolithic materials. Recent efforts have sought to engineer granular systems with tunable mechanical responses, though few have begun to realize them as functional architected materials. Here, we introduce a two-level architected granular framework that …
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Effects of geometry on static and band gap properties of 3D printed metastructures
… in structural applications pushes the need for materials that are able to fulfill multiple functions. Extensive work on effective static properties of different architected materials have shown their ability to push the modulus-density design space, in terms of high effective moduli at low …
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Fracture Mechanics of Networks
Networks of interconnected materials permeate throughout nature, biology, and technology due to exceptional mechanical performance. Despite the importance of failure resistance in network design and utility, no existing physical model effectively reconciles strand mechanics and connectivity to …
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Origami-inspired mechanical metamaterials
Origami-inspired mechanical metamaterials are recognised for their diverse property tuneability and controllable collapse behaviours, but their performances are often limited by the flat foldable unit cells. This thesis introduces a novel concept of heterogeneous origami-inspired mechanical …
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Computational and experimental analyses and optimization of architectured materials
New materials with enhanced properties are of high scientific and industrial interests. Researchers have used materials that are nature-inspired or bioinspired and developed optimization frameworks to come up with such materials. This study presents novel cellular materials (CMs) based on triply …
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On Non-rigid Linkages
… deployable structures, adaptive mechanisms, and architected materials.
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Mechanics of Three-Dimensional Micro-Architected Interpenetrating Phase Composites
The design of modern composite materials, as used in a wide range of engineering applications, is largely derived from a traditional framework based on laminates. While resulting in desirable strength and stiffness properties, the laminate-based structure leads to a high degree of anisotropy and …
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Thermally tunable band gaps in architected metamaterial structures
… advantage of the different moduli of the two materials in the meta-structure that have drastically different temperature dependences, to preferentially tune the modulus of the lattice material compared to the resonant inclusion. We introduce an additional concept, termed thermal partitioning, …
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Mechanics of magneto-active elastomers and applications to magnetically-tunable metamaterials
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-05-01
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A design protocol for failure resilient architected metamaterials
… development of light and strong mechanical metamaterials reporting extreme effective and functional properties. As additive manufacturing progresses to proliferate these metamaterials, their application as structural materials is ultimately limited by their tolerance to damage and defects. While …