Catálogo de publicaciones - tesis
Título de Acceso Abierto
Desarrollos en mecánica computacional de falla material: Aplicación a modelos de plasticidad y daño
Pablo Javier Sánchez Victorio Sonzogni Guillermo Etse Alfredo Huespe Mario Storti Alberto Cardona
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Resumen/Descripción – provisto por el repositorio digital
In this research work, finite element (FE) formulations for the numerical simulation of strain localization phenomenon are studied and developed, including some efficient strategies devised to modeling discontinuities in the solid. First, the strain localization problem is approached by means of an implicit gradient model. After recognizing some limitations in this regularization scheme, the so called cohesive model based on FE with embedded discontinuities is introduced in the thesis. Particularly, the Continuum Strong Discontinuity Approach (CSDA) has been adopted as the main theoretical framework in this work. Taking into account isotropic continuum damage models to simulate quasi-brittle fracture, an extensive and comparative analysis referred to the two potentially more effective families of FE with embedded strong discontinuities, is presented. After making an efficient implementation of both technologies of elements, rigorous conclusions with respect to fundamental topics in failure analysis are obtained, such as: robustness, convergence rates, precision of the response and computational cost. Another important contribution in the theoretical context of CSDA is the mathematical formulation and numerical implementation of a new FE to capture shear bands in isochoric plasticity. The proposed element is based on a consistent coupling of a mixed stabilized formulation (PGP) jointly with the constitutive regularization and kinematical enrichment provided by the CSDA. In order to demonstrate the performance of the strategies used and developed in this thesis, several numerical examples which represent true challenges from the computational point of view are reported, including three dimensional cases and problems involving the propagation of multiple cracks.Palabras clave – provistas por el repositorio digital
Strain localization; Quasi-brittle fracture; Ductile failure; Strong discontinuity approach; Incompressibility; Stabilization methods; Localización de deformaciones; Falla cuasi-frágil; Falla dúctil; Aproximación por discontinuidades fuertes; Incompresibilidad; Métodos de estabilización
Disponibilidad
| Institución detectada | Año de publicación | Navegá | Descargá | Solicitá |
|---|---|---|---|---|
| No requiere | 2011 | Biblioteca Virtual de la Universidad Nacional del Litoral (SNRD) |
|
Información
Tipo de recurso:
tesis
Idiomas de la publicación
- español castellano
País de edición
Argentina
Fecha de publicación
2011-10-18
