Banca de DEFESA: Guilherme Oliveira Ferraz de Paiva

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : Guilherme Oliveira Ferraz de Paiva
DATE: 25/04/2023
TIME: 08:00
LOCAL: Plataforma Teams
TITLE:

DEVELOPMENT AND APPLICATION OF HIGH ORDER GLOBAL-LOCAL SGFEM WITH FLAT-TOP FUNCTIONS FOR ANALYSIS OF STRUCTURES UNDER DAMAGING PROCESS

KEY WORDS:

GFEM, Fracture Mechanics, Continuum Damage Mechanics, Global-Local, Polynomial Enrichment, Crack Propagation

PAGES: 241
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Estruturas
SPECIALTY: Mecânica das Estruturas
SUMMARY:

This work aimed to analyze and implement a global-local approach combined with polynomial and discontinuous enrichment functions, according to the strategy of the Stabilized Generalized Finite Element Method (SGFEM), for application in simulations of failure problems in structures using a bilinear damage model. The most important contribution of this research was the study of damage in structural members under failures using coarse meshes (2D and 3D), with the application of enrichment functions to improve the approximation of the damage distribution and obtain computational efficiency in the process by reducing the number of iterations performed per load step and, consequently, reduce the number of processed degrees of freedom. The results were validated by comparing them with the crack path and with experimental curves taken from different types of tests found in the literature, with different types of materials and failure modes. The simulated tests were: three-point bending in beams with central notch, four-point shear in beam with central notch, square plate with double notch, L-shaped plate, beam without notch under four-point bending and human femur. The computational efficiency and accuracy of GFEM and SGFEM were proven to improve the prediction of rupture behavior in presenting quality results, with mesh objectivity and computational efficiency. The SGFEM combined with the global-local approach (with standard PU or flat-top) showed good ability to improve the quality of the final approximation, with the rational use of enrichment functions, in coarse meshes, combining characteristics such as flexible modeling, convergence and computational efficiency. The application of the discontinuous strategy ensured versatility, eliminating the need to use special elements or remeshing.

BANKING MEMBERS:
Presidente - 2047809 - FRANCISCO EVANGELISTA JUNIOR
Externo ao Programa - 1122686 - EDGAR NOBUO MAMIYA
Externo ao Programa - 1012696 - RAMON SALENO YURE RUBIM COSTA SILVA
Externo à Instituição - SÉRGIO PERSIVAL BARONCINI PROENÇA
Externo à Instituição - FELÍCIO BRUZZI BARROS - UFMG