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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 “"Model Composite"”.
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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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Particulate composite material internal deformation measurements using x-ray microtomography and digital volume correlation
Typical particulate composites used in engineering applications consist of complex microstructures with a range of particulate sizes and often high particulate volume fractions (65%-95%). Examples of these are, explosives and rocket propellants for defense and aerospace applications, asphalt …
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Modular Approach to Spintronics
… modules can be integrated seamlessly to model composite devices involving both spintronic and nanomagnetic phenomena, even when subtle quantum mechanical properties of spin are involved. We envision the library of modules to evolve both by incorporating new modules and by improving …
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Investigative Application of the Intrinsic Extended Finite Element Method for the Computational Characterization of Composite Materials
… analysis of carbon nanotube-epoxy nanocomposites, containing aligned nanotubes, is performed using the mesh independent intrinsic extended finite element method (IXFEM). The IXFEM employs a localized intrinsic enrichment strategy to treat arbitrary discontinuities defined through the …
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Effect of the interphase on the thermo-mechanical response of unidirectional fiber-reinforced epoxies: modeling, analyses and experiments
… complexity of the fiber-matrix interphase in a composite is largely due to the myriad of variables (material, processing, and design) that affect its formation. The interphase, thus formed, has to be characterized at several levels (micro-structural, chemical, and mechanical) in order for one to …
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Healing of complex damage modes in model composites
… has potential to extend the usable lifetime of composite materials. Introducing self-healing systems to fiber reinforced composites has proven to be difficult due to the high temperatures and pressures of processing as well as the requirement that the delivery scheme for the healing agent must …
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A process simulation model for the manufacture of composite laminates from fiber-reinforced, polyimide matrix prepreg materials
A numerical simulation model has been developed which describes the manufacture of composite laminates from fiber-reinforced polyimide (PMR-15) matrix prepreg materials. The simulation model is developed in two parts. The first part is the volatile formation model which simulates the production of …
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Axial, flexural and torsional rigidities of two-dimensional braided fibre composite medical catheters
The development of a one-piece braided model catheter with the same rigidities as the combined medical catheter-guidewire system presently employed during cardiovascular catheterization procedures is the principal goal of this research. This will result in a significant reduction in the time …
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An Investigation of the Structure-Property Relationships for High Performance Thermoplastic Matrix, Carbon Fiber Composites with a Tailored Polyimide Interphase
… was used to fabricate PEEK and PPS matrix composites with polyimide interphases of tailored properties. The structure-property relationships of Ultem-type polyimide and BisP-BTDA polyimide which were made from various water soluble polyamic acid salts were studied. The molecular weight of …
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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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Multiscale characterization of carbon fiber-reinforced epoxy composites
… is an early form of damage in fiber-reinforced composite materials that can nucleate delamination, fiber breakage, and ultimate failure. Although many variables influence transverse cracking, little work has been done to characterize local and complex microstructural features which affect this …
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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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Development of adsorption filtration process for virus removal for drinking water treatment
… The experimental studies confirmed that a model composite NOM/virus filter can remove more that 6 logs of viruses in the presence of NOM. The composite filter run was about 100 hours, compared to only 10 hours without the NOM prefilter. The design of the composite NOM/virus filter with a …
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Approaches to quantifying and reducing uncertainty in GCMs over Southern Africa
Global Circulation Models (GCMs) are the primary tool for simulating future climate changes. These models by necessity make use of various assumptions and simplifications due to computational constraints, and in so doing introduce biases and systematic error. Along with other sources of uncertainty …
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Solvent-based self-healing approaches for fiber-reinforced composites
Damage in composite materials spans many length scales and is often difficult to detect or costly to repair. The incorporation of self-healing functionality in composite materials has the potential to greatly extend material lifetime and reliability. Although there has been remarkable progress in …
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Multiscale finite element models for the analysis, design and optimisation of variable stiffness composites
L'abstract è presente nell'allegato / the abstract is in the attachment
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Holographic and Composite Models of the Axion
… excellent dark matter candidate. If the axion is composite, it must be bound by a novel strong interaction. Some strongly-coupled models, mathematically intractable until now, are recently discovered to be calculable through a mapping onto 5-dimensional gravity. We propose a series of composite …
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Particle Physics in the LHC Era
… together to form what we now call the Standard Model (SM) of particle physics. Finally, it was through the ideas of the renormalization group and effective field theory that the understanding of how the SM fits into a larger framework of particle physics was crystallized.</p> <p>In the past four …