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Showing 1 to 9 of 9 for “"Nonlinear Mechanics"”.
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The Application of The Techniques of Nonlinear Mechanics to The Analysis and Synthesis of Servomechanism Systems
Made available in DSpace on 2014-12-04T21:02:33Z (GMT). No. of bitstreams: 1 0003149.pdf: 6739105 bytes, checksum: f85eb7fbeda59664ed557f88356039e6 (MD5) Previous issue date: 1951
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Analysis of cracks in nonlinear fiber composite materials
The effect of effective material nonlinear properties of fiber composites on crack behavior is studied. Three-dimensional nonlinear constitutive equations are established, based on both complementary energy density and deformation plasticity approaches. A system of highly nonlinear, coupled …
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Stochastic Sea Ice Modeling with the Dynamically Orthogonal Equations
… types and scales of sea ice and the complex nonlinear mechanics and high dimensionality of differential equations, efficient ocean and sea ice probabilistic modeling, Bayesian inversion, and machine learning are challenging. In this work, we implement a deterministic 2D viscoplastic sea ice …
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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.
… largely unexplored. This thesis investigates the nonlinear mechanics of spinodal architected materials by combining a comprehensive experimental dataset with computational modeling. A total of 107 unique morphologies were fabricated and subjected to uniaxial compression along three principal …
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Constitutive modeling of glassy memory polymers
… glassy shape memory polymers using elements of nonlinear mechanics and polymer physics. The key feature of this framework is that a body can exist stress free in numerous natural configurations, the underlying natural configuration of the body changing during the process, with the response of …
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Mechanics of Beams and Plates with Variable Mechanical Properties
… their mechanical behaviour, particularly in the nonlinear regime and when thickness-stretching effects are considered, remains underexplored. To address this gap, the present thesis develops two-dimensional (2D) and quasi-3D theoretical frameworks to investigate the linear and nonlinear mechanics …
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Convolution method in elastodynamics
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01
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Mechanics of living cells: nonlinear viscoelasticity of single fibroblasts and shape instabilities in axons
Biomechanics is a field of major biological relevance. In spite of the vast complexity of biological matter, a number of generic features are found to hold in the mechanics of soft tissues throughout all of its length scales. A major goal in biomechanics is to reduce its general features to those …