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THÔNG TIN TÀI LIỆU
Cấu trúc
Couverture
Acknowledgments
Dédicace
Contents
List of Figures
List of Tables
Notations and conventions
GENERAL INTRODUCTION
Textile fabric composites
Inflatable structures
Stability of inflatable structures
Objectives
Thesis Outline
BACKGROUND
Textile structures and textile preforms
Context
Classification of textile preforms
Microscopic observation
Unit cell and geometric parameter
Stress transfer and characteristics lengths
Damage due to tensile loading
Prediction of engineering properties using micro-mechanics
Prediction of engineering properties using numerical approach
Experimental measurement of engineering properties
The role of experiments in structural stability
EXPERIMENTAL STUDIES
Introduction
Mechanical behavior of the fabric
Engineering constants
Strain measurement
Fabric tensile testing at our laboratory: Biaxial beam inflation test on fabric beam
Analysis of elastic moduli
Determination of shear modulus of HOWF composite
Experimental buckling of an inflatable beam
Experimental buckling test on a simply supported HOWF beam
Test set-up and instrumentation
Boundary conditions
Measurement of displacements
Conclusion
ANALYTICAL BUCKLING ANALYSIS OF AN HOWF INFLATABLE BEAM
Theoretical background
Kinematics
Constitutive equations
Virtual work principle
Theoretical buckling loads
Previous works on the critical load
Examples: in-plane buckling for linearized problems
Simply supported inflatable beam under compressive concentrated load
Cantilever inflatable beam under compressive axial load at the free end
Clamped-clamped inflatable beam under compressive axial load
Influence of the slenderness ratio on the critical load of an inflatable beam
Wrinkling load for an inflatable beam under a compressive concentrated load
FINITE ELEMENT BUCKLING ANALYSIS OF AN HOWF INFLATABLE BEAM
Literature review
Finite element formulations
Linear eigen buckling
Nonlinear buckling
Implementation of an iterative algorithm for solving the NLIBFE model
Applications and results
Nonlinear buckling of a simply supported NLIBFE model
Wrinkling loads and maximum deflections: Limit of validity for numerical solutions
Validation of the NLIBFE model: the reference model
Comparison with the experimental results
Parametric studies of NLIBFE model
GENERAL CONCLUSION AND FUTURE WORK
Appendices
Reminders in mechanics and material science
Mechanical properties of composite materials
Hyperelasticity: theoretical basis
Hyperelasticity and orthotropic materials
Orthotropic materials
St. Venant-Kirchhoff orthotropic material
Thin-walled structures : thin-shells and membranes
Theoretical model
Nonlinear finite element model
Bibliography
Résumé
Abstract
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