DEVELOPMENT OF A LIFETIME MODEL OF COMPOSITE STRUCTURES IN STATIC AND FATIGUE
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Date
2026
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CHAPELLE David / HOCINE Abdelkader
Abstract
The objective of this project is to develop an analytical model that predicts the lifetime of
multilayer tubular structures. These structures are made with long glass fibers and an epoxy
matrix. These tubes contain six layers with an orientation angle of 55°. The developed model
simulates the mechanical response of a cylindrical composite structure under different types
of loading, such as pure internal pressure, internal pressure with background effects, tension,
and cyclic fatigue. Tensile and cyclic traction tests were performed on composite tubes.
Tensile tests allow us to estimate ultimate stress to failure. Cyclic reaction tests allow us to
estimate the remaining potential. The developed model allows us to estimate the number of
cycles to failure of the composite tube. Cyclic tensile tests allow us to determine the
remaining potential of composite tubes. The results show that when composite tubes are
exposed to cyclic loading, the number of cycles induces a significant change in the shape of
the tensile stress-strain curve and a decrease in the elastic modulus. Additionally, cyclic
loading tests are conducted at multiple stress amplitudes (40%, 60%, and 80% of the ultimate
tensile strength) to evaluate the material's fatigue life and damage progression at different
load levels. These tests quantify the relationship between stress amplitude and the number of
cycles to failure.
Description
THESIS
Submitted in fulfillment of the requirements for the degree of:
DOCTORATE (SCIENCE)
Field: Mechanical Engineering
Specialty: Mechanical Construction
Keywords
Tubular structure, Multilayer composite, Viscoelastic