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 17 of 17 for “"Small deformation"”.
-
Analysis of nonlinear electroelastic continua with electric conduction
… thesis presents the nonlinear theory for large deformation electroelastic continua with electric conduction. This theory is suitable for modeling actuator and sensor devices composed of deformable, electromechanically coupled, highly insulating materials. Consistency is proven between the large …
-
On a class of strain gradient plasticity theories : formulation and numerical implementation
… basic nature of strain gradient theories; * A small deformation crystal plasticity theory; * A small deformation theory for isotropic viscoplastic materials; and, * A large deformation theory for isotropic viscoplastic materials. The theories are based on: (i) microstresses consistent with …
-
Electro-deformation of a moving boundary: a drop interface and a lipid bilayer membrane
This dissertation focuses on the deformation of a viscous drop and a vesicle immersed in a (leaky) dielectric fluid under an electric field. A number of mathematical tools, both analytical and numerical, are developed for these investigations. The dissertation is divided into three parts. First, a …
-
A numerical method for electro-kinetic flow with deformable interfaces
… boundary conditions and matching methods. The small deformation theories when Ca is small (Ca is the electric capillary number) for both quasi-steady state and time dependent problems are developed to check numerical simulations.
-
Stress and deformation of thin films and patterned lines on substrates
… to isotropic, blanket films that undergo only small deformations, proper interpretation of curvature-stress relationships for new film geometries and for new experimental testing techniques requires an extension of this analytical framework. Mismatch stresses in thin films/lines and consequent …
-
The Runge-Kutta Taylor-SPH model, a new improved model for soil dynamics problems
… behavior of dry soils in the framework of small and large deformation theory and of dynamics behavior of saturated soils in the framework of small deformation theory. A numerical code has been developed to analyze such behaviors and presents three versions: - The Runge-Kutta Taylor-SPH for …
-
Development and validation of coaxial cable sensors for damage detection of reinforced concrete structures
… for monitoring of civil infrastructures. Due to small deformation and minor cracks of engineering interest, coaxial cables have never been applied into reinforced concrete (RC) structures until the late 1990s. The state of the art in design of a cable sensor is to replace the polyethylene pipe of …
-
The Effect of Suspension on Parametric Stability and Bifurcation of Geared Systems in Permanent Contact Regime
… of this work is to investigate the effect of small deformation of the shafts upon the number of unstable tongues, and the nonlinear behavior of gears under constant speed and heavy-load operational conditions where the permanent contact condition holds. The lumped parameter analysis method is …
-
Nonlinear structural design using multiscale topology optimization
… the local constitutive evolution equations of small deformation elastoplasticity. Furthermore, to extend the adjoint sensitivity formulation, we account for the history dependence of internal state variables. Using these sensitivities and topology optimization, we distribute two elastoplastic …
-
On Non-rigid Linkages
… load-bearing assemblies with negligible internal deformation. Between these extremes exists a broad class of systems — deployable structures, multistable trusses, origami-inspired architectures, and compliant mechanisms — that exhibit purposeful motion, elastic deformation, and geometric …
-
Linear and non-linear deformations of a wind turbine blade considering warping and all aeroelastic load couplings
… or without blade's pretwist for both the linear small deformation case and the nonlinear large deformation case. To the best knowledge of the author the simultaneous inclusion of all these factors has not been done before. The "assumed modes method" was used, in which displacements are assumed to …
-
CHARACTERISATION OF THE MECHANICAL BEHAVIOUR OF NETWORKS AND WOVEN FABRICS WITH A DISCRETE HOMOGENIZATION MODEL
… order continuum is better fit to represent the deformation of the micro-structure. Special results were obtained for the case of fibres connected by pivots. In this cases an orthotropic material with zero shear modulus was obtained. Such a material has a not elliptic constitutive tensor, thus it …
-
Shear-wave imaging guidance for high-intensity focused ultrasound therapy
… in medical ultrasound is developed to detect small deformation, which is caused by the propagating HiSW. Due to physical limitations of ultrasound imaging, HiSW has to operate above the thermal and mechanical FDA limit. The parameters of acoustic intensity required for adequate HiSW detection …
-
Analisi teorica, numerica e sperimentale dei processi di grandi deformazioni nei materiali duttili
… part of a bigger list of factors that affect the deformation properties of a body, leading to many complications in the theoretical analysis of solids and structures. To solve this problematic, the mathematical models used to include into the calculation the above cited effects (obtaining …
-
Thermomechanical properties of novel lanthanum zirconate based thermal barrier coatings - an integrated experimental and modeling study
… (FE) methods. The nanoscale tensile and shear deformations of LZ single crystal are simulated using DFT calculations with the generalized gradient approximation (GGA) functional. The anisotropic Young’s moduli are studied using two approaches: (1) stress-strain curve of large deformation, and …
-
Modeling the dynamics and stresses of elongated particles in vertical axis mixers
… is consistent with prior observations. The smallest solid fractions are located in the wake region and at the bed's free surface, which is similar to the patterns for spheres. In general, larger particle aspect ratios decrease the overall bed solid fraction as well as the solid fraction …
-
Influence of some particle characteristics on the small strain response of granular materials
The key parameters representing the small strain response of geomaterials are the very small strain shear modulus, Gmax, shear modulus degradation G/Gmax, and damping ratio. These are also important parameters in the design of foundations where only small deformation takes place. A review of the …