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 20 of 118 for “"micromechanics"”.
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Micromechanics of piezocomposites
Over the past two decades, materials engineers have developed piezoelectric-polymer composite materials that enable effective electromechanical properties to be tailored for a specific application. These materials are made by combining conventional piezoelectric ceramics with piezoelectrically …
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Micromechanics of toughening in polymeric composites
The macroscopic tensile toughness of glassy homo-polymers is often limited due to either localized crazing followed by failure [e.g., polymethyl-methacrylate (PMMA), polystyrene (PS)], or cavitation-induced brittle failure under high triaxiality [e.g., polycarbonate (PC)]. Judicious choice of …
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Optical deformability : micromechanics from cell research to biomedicine
When a laser beam is incident on the surface of a transparent object, the optical surface forces, generated by the interaction of the light with the material, are directed away from the denser material and normal to its surface. This physical phenomenon can be used to probe the mechanical …
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Nano-Micromechanics: Modeling theEffective Response of Polymer Nanocomposites
… usefulness and validity of using continuum scale micromechanics models to describe the properties of nanocomposites has been demonstrated. Less has been done to examine the effect of scale with respect to the large number density, and close packing of the particles. The scale of particle …
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A Micromechanics Study on Ferroelectrics and Multiferroic Composites
… exponential functions into the micromechanics-based model to establish the nonlinear constitutive relations of a ferroelectric material. Then, for the two-phase ferroelectric composites, the Mori-Tanaka Method can be applied to analyze and solve the overall effective …
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Micromechanics-Based Analysis of Fiber-Reinforced Laminated Composites
A procedure for three-dimensional nonlinear material modelling of fiber-reinforced laminated composites is presented. The material modelling procedure has a two-level hierarchical structure. At the bottom level, constitutive information about the fiber and the matrix phases are synthesized using a …
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Micromechanics of the through-thickness deformation of paperboard
An experimental investigation of the behavior of paperboard has been performed, focusing on the identification of the mechanisms of through-thickness deformation. Experiments have been conducted at the microscopic and macroscopic levels, the difference between the two being the length scale. …
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Micromechanics of strength-related phenomena in composite materials
Micromechanical models are presented which can be used to evaluate: stress concentrations in the vicinity of single and multiple fiber fractures in unidirectional composites under axial loading; the tensile strength of unidirectional composites; fiber coatings that can be used to maximize the …
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Micromechanics of finite length fibers in composite materials
A theoretical model is derived to study the point-wise stress variations which occur in the constituents of a hybrid 3-D short fiber composite subjected to arbitrary homogeneous loading conditions. The model includes the capability to analyze composites containing different types of fibers, …
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Micromechanics of crenulated fibers in carbon/carbon composites
The influence of crenulated noncircular fibers on the micromechanical stress states due to a transverse strain and to a temperature change in carbon/carbon composites is examined using the finite element method. Stresses at the interface of both fully bonded and fully disbonded fibers having two …
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Studies of Lung Micromechanics via Hyperpolarized 3He Diffusion NMR
While high quality MR Images of lungs are difficult to obtain with conventional proton MRI due to the organ's low tissue density, the advent of techniques in noble gas polarization have enabled MR investigations of the lung's more abundant air space rather than its tissue. In addition to …
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Micromechanics of ultra-high molecular weight polyethylene fibre composites
Ultra-high molecular weight polyethylene (UHMWPE) fibre composites are considered to be state-of-the-art materials for penetration and ballistic impact protection applications. The composites are made of strong UHMWPE fibres with a soft compliant matrix. The extreme anisotropy caused by the …
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Microstructure and micromechanics of the sea urchin, Colobocentrotus atratus
… is to study the porous microstructure and the micromechanics of the exoskeletal armor of the helmet urchin, Colobocentrotus atratus. Its unusual reduction in spines forms a smooth tiling of millimeter-sized, flattened polygonal protective aboral spines. Each aboral spine articulates with the …
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Micromechanics-Based Strength and Lifetime Prediction of Polymer Composites
With the increasing use of composite materials for diverse applications ranging from civil infrastructure to offshore oil exploration, the durability of these materials is an important issue. Practical and accurate models for lifetime will enable engineers to push the boundaries of design and make …
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Micromechanics of the Hydrogen Effect on Plasticity and Interfacial Decohesion
A traction-separation law that describes the cohesion of an interface in the presence of hydrogen is suggested and implemented through interfacial cohesive finite elements to study interfacial debonding around an elastic particle imbedded in an elastoplastically deforming matrix, while transient …
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Micromechanics of deformation and abrasive wear of fiber-filled elastomers
The abrasive wear of unfilled and fiber-filled elastomers was studied both with experiments and with finite element simulations. Wear experiments with elastomer seals exhibited two distinct regimes: an initial, "break-in" period followed by an "aggressive wear" period. During the break-in period, …
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Micromechanics of Granular Media: A Fundamental Study of Interphase Systems
… soil to inclusion relative geometry. A new micromechanics-based approach, which utilizes microscopic quantities to explain the mechanics of granular media from a continuum point view, is adopted to investigate the mechanisms that underlie the interphase behavior. It is shown that the grain …
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