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 6 of 6 for “"negative Poisson's ratio"”.
-
Crack growth, singularities and wave propagation in auxetic composite materials
An auxetic material is a material which has a negative Poisson's ratio, so they exhibit lateral expansion upon longitudinal tensile loading, or undergo lateral contraction under longitudinal compression. Such materials can exist in cellular form, or along specific axes in certain crystals. The …
-
Elasticity Measurement at High Temperatures
… is used to excite the resonant modes of vibration of thin discs. The temperature variations of Poisson's Ratio and Young's modulus are measured using these modes. The elastic constants of a variety of grades of graphite, including pyrolytic graphite (which was found to have a negative …
-
Modeling and simulation of stochastic phenomena in carbon nanotube-based single molecule sensors
… out-of-plane fluctuations would lead to a negative Poisson's ratio, known as an auxetic material. We present simulations for what the properties of a sheet might look like. In addition, we present simulations for how these properties change as a membrane is strained and showing the …
-
Simulation informed design of stimuli responsive structures and higher-order assemblies in DNA nanotechnology
… measurements, as fiducials for instrument calibration, and as therapeutics for disease. As the field matures, the need for effective models for these devices increases, to enable faster design iteration and to contextualise results. This thesis reports on several novel applications of DNA …
-
A new class of auxetic lattices
… three different realizations that leads to a Poisson's ratio arbitrarily close to the thermodynamic limit corresponding to ν = -1. The effect is achieved by the superposition of clockwise and anti-clockwise internal rotations leading to a macroscopic non-chiral effect. We have detailed the …
-
Experimental and Numerical Study of Ductile Metal Auxetic Tubular Structures
… of metamaterials that exhibit counterintuitive negative Poisson's ratio (NPR) behavior based on their geometric configuration. Cellular auxetics are light-weight and cost-effective materials that have the potential to demonstrate high strength and resilience under axial forces. Existing research …