Banca de DEFESA: Alan da Silva Moura

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Alan da Silva Moura
DATE: 31/05/2023
TIME: 14:00
LOCAL: TEAMS
TITLE:

METHODOLOGY FOR SIMULATION AND EVALUATION OF COHEIVE FRACTURE AND PROPAGATION OF MULTIPLE CRITICAL CRACKS IN BRITTLE MATERIALS

KEY WORDS:

Cohesive Fracture; Crack Propagation; Brittle Materials; Boundary Elements; BEMCRACKER2D

PAGES: 123
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Estruturas
SPECIALTY: Mecânica das Estruturas
SUMMARY:

In its notable progress, Linear Elastic Fracture Mechanics (LEFM) equipped with Computational Mechanics, made explicit the enormous lack of structural norms in the face of structural failures conceived in brittle materials, still allocated under stresses lower than the design stress limit. Generally, such failures are due to events ranging from structural weaknesses to the occurrence of failure by the brittle fracture mechanism. Characterized by the arbitrary arrangement of its granular constituents, concrete is the most used brittle material in the world, anisotropic composite and subject to unique phenomena, such as the size effect. Macroscopically, it is taken as a material resulting from the union between cementitious paste, aggregates and a transition zone between them, composed of a portion of already fragile material, before its mechanical action due to the presence of numerous microfailures resulting, mainly, from the high accumulation of water in the region. Thus, based on the LEFM, it is proposed the development of a methodology applicable to the analysis of the phenomena of cohesive fracture and multiple critical cracking in brittle materials, through the use of homemade processing software, BEMCRACKER2D, and pre- and post-processing, the BEMLAB2D interface, both based on the Dual Boundary Element Method (MECD). Briefly, the proposed methodology is based on an interactive process consisting of two stages: the first comprises the use of the BEMCRACKER2D and BEMLAB2D software to carry out analysis procedures and incremental obtainment of cracking, displacements, stresses and their respective Stress Intensity Factors (SIF). The second stage covers the creation of a routine in MATLAB for prospecting cohesive fracture processes through softening curves, represented by linear, bilinear and exponential cohesive models. Altogether, ten classic models from the literature are considered for verification, validation and application of the developed methodology, presenting results fully consistent with expectations.

BANKING MEMBERS:
Presidente - 1439182 - GILBERTO GOMES
Interno - 404840 - WILLIAM TAYLOR MATIAS SILVA
Externo ao Programa - 1722212 - EDER LIMA DE ALBUQUERQUE
Externo à Instituição - SERGIO GUSTAVO FERREIRA CORDEIRO