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 20 of 166 for “"Finite element simulations"”.
-
Finite Element Simulations of Two Dimensional Peridynamic Models
… to be developed. In this study, we use numerical simulations to investigate the behavior of bond-based peridynamic models under this limit for a number of cases where analytic solutions of the classical elasticity problem are known. To carry out this study, the integral-based peridynamic model is …
-
Finite element simulations of fatigue crack growth and closure
A modified elastic-plastic finite element program was used to simulate fatigue crack growth and closure. The study has identified some of the factors that contribute to crack closure. It has provided an evaluation of stress, strain and displacement fields near crack tips and their contribution to …
-
Finite element simulations of steady viscoelastic free-surface flows
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1996.
-
Finite-element simulations of interfacial flows with moving contact lines
… an interface-preserving level-set method in the finite-element framework for interfacial flows with moving contact lines. In our method, the contact line is advected naturally by the flow field. Contact angle hysteresis can be easily implemented without explicit calculation of the contact angle …
-
Numerical-Informational methodology for characterising steel bolted components coupling finite element simulations and soft computing techniques
… To this end, numerical models based on the finite element method (FEM) are first developed to reproduce the real response of bolted components. These models incorporate progressive damage mechanisms and failure criteria to accurately estimate the displacement at fracture. In order to …
-
Mechanics of swellable elastomeric seals
… leakage due to the same mechanism. Corresponding finite element simulations predict a fluid leakage path that agrees qualitatively with experiments. The second part of this thesis consists of an experimental investigation of the eect of geometry and metal support rings on the performance of …
-
Prediction of natural frequencies of turbine blades for turbocharger application. An investigation of the finite element method, mathematical modelling and frequency survey methods applied to turbocharger blade vibration in order to predict natural frequencies of turbocharger blades.
… conditions were investigated by application of Finite Element Analysis and beam theory. Modelling and simulation methods were developed ; the first method composed of 15 finite element simulations ; the second composed of 15 finite element simulations and a set of experimental frequency survey …
-
Formulation and Implementation of a Constitutive Model for Soft Rock
… constitutive model, and to apply the model to finite element simulations of engineering problems encountered in chalk and soft rock. A new rate-dependent constitutive model is developed based on a three-dimensional extension of a volumetric time-lines model, similar to that of Bjerrum (1967). …
-
Failure of Microelectromechanical Systems Under Dynamic Loading: An Experimental and Numerical Investigation
… profile on the failure of the cantilever beams. Finite element simulations of these beams were conducted to provide more detailed information regarding the deformation of the beams under the various loadings applied in the experiments. Results of the simulations were coupled with experimental …
-
Vibrations in Lightweight Buildings - Perception and Prediction
… for instance by using numerical methods such as finite element simulations as prediction tools. These predictions tools allow one to simulate buildings before they are built so as to examine their vibratory and acoustic performance. Development of such accurate finite element prediction tools is …
-
Nonequilibrium energy transport in heterogeneous nanoscale semiconductors
… first, continuum-level analytical theories and finite element simulations are employed to derive exciton distributions in semiconductor films. These models are applied to transient photoluminescence interfacial quenching experiments of CdSe QD thin film interface to measure exciton diffusion …
-
Dynamic Behavior of Sandwich Beams With Internal Resonators
… up. The experimental results were verified using finite element simulations. Further experiments were carried out by tuning the resonators at 12 Hz and it was demonstrated that a wave attenuation bandgap can be created at low frequencies which would help attenuate low frequency periodic loads such …
-
Thermomechanical modelling of powder compaction and sintering
… which compares well with other models and finite element simulations. The parameters of the thermomechanical model are determined on the basis of available data and dilatometer experiments. Finally, after computer implementation, validation of the model is performed with a specially …
-
Microwave Impedance Microscopy Of Nanostructured Carbon
… part of the reported change is calibrated with finite element simulations and physical measurements of a standard capacitive sample, and thereafter the output ∆Y is given a reference value in siemens. Simulations also provide a means of extracting sample conductivity and permittivity from …
-
Lifting Analysis of Precast Prestressed Concrete Beams
… and the cross-sectional angle of twist. Finite element simulations are performed to investigate the behavior of concrete beams during lifting and to validate the proposed method. Additionally, a statistical characterization of beam imperfections is presented, based on recently conducted …
-
Towards integrated silicon photonic architectures for quantum information processing
… refractive index shifts is explored through finite-element simulations.
-
Finite element analysis of failure modes in dynamically loaded pre-cracked steel plates
Finite element simulations are carried out to study transient stresses and strains in the pre-cracked (pre-notched) 4340 steel plates impacted by a projectile in the direction of the notch ligament. The computations employed Johnson - Cook model which takes into account strain hardening, …
-
Material and Geometric Analysis of Structures Subjected to Large Deformation
… constants are obtained through data regression. Finite element simulations have been conducted to simulate the deformed shapes of a membrane around several representative geometries under various vacuum pressure and constraint conditions. Experimental results have been compared with predictions …
-
Dynamics of Small Elastic Systems in Fluid: Tension and Nonlinearity
… excellent agreement with the noise spectrum from finite element simulations, which is computed from the deterministic ring down. This agreement is shown across different fluids (air and water), and for multiple measuring points including at the beam midpoint and the quarter point. In addition to …
Page 1 of 9