Banca de DEFESA: TALITA GALVAO TARGINO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : TALITA GALVAO TARGINO
DATE: 02/10/2023
TIME: 09:00
LOCAL: Plataforma de Videoconferência
TITLE:

Mechanical Behavior and Mechanisms of Damage in Carbon/Epoxy Laminates with Traditional Layup and Double-Double Layup under Low Speed Impact

KEY WORDS:

Double-double, Quad, Impact, Mechanical properties, Damage

PAGES: 90
BIG AREA: Engenharias
AREA: Engenharia Aeroespacial
SUBÁREA: Materiais e Processos para Engenharia Aeronáutica e Aeroespacial
SUMMARY:

The optimization of composite material structures, aiming at reducing manufacturing time and costs, decreasing weight, and improving mechanical properties, holds great technological importance and has been the subject of numerous studies. This study investigates the mechanical behavior of two carbon fiber reinforced/epoxy laminates (AS4/8552) with equivalent in-plane stiffness and thickness but different stacking sequences: A [±0/±55]_3T laminate, of the type double-double (DD) [±Φ/±ψ]n, and a traditional quadriaxial laminate (QUAD) [0₃/90/±45]_S. Strength and stiffness of the laminates were assessed by performing uniaxial compression tests, low-velocity impact tests with three energy levels (30 J, 45 J, and 74 J) and compression after impact (CAI) tests. Additionally, damage mechanisms were evaluated through X-ray computed tomography, and a mathematical model was proposed to study the residual behavior of the laminates. According to this mathematical model, it was observed that the residual strength of the laminates can be related to the delaminated area, although the damage distribution occurs quite differently between the laminates. Ultimately, it was found that the mechanical properties of the two laminates were similar, which supports the possibility of using DD laminates to replace the traditional QUADs, with advantages such as easier fabrication, lower weight, homogenization and optimized stacking sequence.

COMMITTEE MEMBERS:
Presidente - 1202134 - JOSE DANIEL DINIZ MELO
Interno - 1338331 - RAIMUNDO CARLOS SILVERIO FREIRE JUNIOR
Externo ao Programa - 1064594 - EVANS PAIVA DA COSTA FERREIRA - UFRNExterno à Instituição - CARLOS ALBERTO CIMINI JUNIOR - UFMG
Externo à Instituição - LUCAS LISBÔA VIGNOLI - UFRJ