Banca de QUALIFICAÇÃO: KAROLINE SALES DE OLIVEIRA GUSMÃO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : KAROLINE SALES DE OLIVEIRA GUSMÃO
DATA : 23/07/2025
HORA: 14:00
LOCAL: Microsoft TEAMS
TÍTULO:

CARACTERIZAÇÃO MECÂNICA DE HDPE EXTRUSADO: COMPORTAMENTO EM INDENTAÇÃO, DESGASTE, FLUÊNCIA, FADIGA, TRAÇÃO E COMPRESSÃO.

PALAVRAS-CHAVES:

Polietileno de Alta Densidade; Tração; Compressão; Fluência; Fadiga; Fretting.

PÁGINAS: 97
RESUMO:

High-density polyethylene (HDPE) is a thermoplastic polymer widely used in offshore
applications, especially in seawater intake systems, due to its high chemical resistance, low
weight, and good mechanical properties. However, its long-term durability is a critical factor
as, in its final application, the material can be subjected to different loading conditions, such
as traction, compression, fatigue, creep, and abrasive wear or fretting wear in aggressive
environments. These factors can compromise its structural integrity over the years, making
a detailed characterization of its mechanical behavior essential to optimize its performance
and ensure greater reliability.
This study aims to analyze the mechanical behavior of extruded HDPE under complex
compressive loading conditions. Thus compression, creep, indentation, axial-torsional fretting
wear, and abrasive wear tests were performed to understand the degradation mechanisms
associated with tribological phenomena commonly present in sliding contact and mechanical
vibration applications.
In addition, a previous study, conducted in co-authorship, investigated the behavior of the
material under tensile loading, tension creep, and the effect of the thickness of the sample on
tensile creep. Fatigue performance was also evaluated using tests with load ratios of R = 0.1
and R = −1, as well as an analysis of the frequency effect on fatigue behavior.
Based on the results of the present study and the previous investigation, it was observed
that creep is the predominant degradation mechanism for this material, showing a more significant
influence than fretting wear under complex loading conditions.
There is a clear lack of literature on the behavior of extruded HDPE—or polymer blends
in general —under complex loading conditions, particularly those applied in this specific test
configuration. Given this gap in the scientific literature, the contributions generated by both
the work already conducted and future research steps are expected to be innovative, offering
significant advancements for both the scientific community and the industry.

MEMBROS DA BANCA:
Externo à Instituição - DANIEL CARLOS TAISSUM CARDOSO - PUC - RJ
Interno - 1646090 - FABIO COMES DE CASTRO
Interno - 1345908 - JOSE ALEXANDER ARAUJO
Presidente - 2143651 - THIAGO DE CARVALHO RODRIGUES DOCA