Mechanical Behavior of Organic Matrix Composites

Marco Gigliotti is Full Professor at the University of Poitiers, Pprime Institute, UPR CNRS 3346 in France. His research concerns the ageing, degradation and durability of organic matrix composites for aeronautical applications.Marie-Christine Lafarie-Frenot is Professor Emeritus at the University of Poitiers in France. Her area of expertise is the mechanical behavior and durability of polymer matrix composites and continuous carbon fibers in aeronautical applications.Jean-Claude Grandidier is Full Professor at ISAE-ENSMA Poitiers, Pprime Institute, UPR CNRS 3346 in France. His field of expertise is the modeling of multi-physical couplings in polymers and composites, combining experimental and numerical approaches.Matteo Minervino is a Materials and Process Engineer in the composite materials department of Safran Aircraft Engines. As part of his activity, he studies the mechanical behavior of composite parts subjected to aggressive environments.

• List of Figures ixAcknowledgements xxiPreface xxiiiIntroduction xxviiChapter 1 Phenomenological Aspects of Thermo-oxidative Ageing of OMCs 11.1 Effect of thermo-oxidation on the local mechanical behavior of the polymer 71.1.1 Oxidized layers 101.1.2 EIT measurements by UMI 141.1.3 Introduction to the parameter γ, an oxidation tracer 191.1.4 Characterizing the local mechanical behavior of the polymer 241.1.5 Oxidized material 331.2 Study of matrix shrinkage induced by thermo-oxidation in unidirectional OMCs 371.2.1 Virgin sample 401.2.2 Sample oxidized under 2 bar O2 471.2.3 Air-oxidized sample 53Chapter 2 Modeling of Thermo-oxidative Ageing of OMCs 592.1 Thermodynamics of irreversible processes with internal variables 592.2 Development of an ageing-dependent behavior law for organic polymers 642.3 Taking into account the initial inelastic and chemical strains 77Chapter 3 Identification and Simulations 793.1 Identifying the behavior law of thermo-oxidized polymers through the inverse analysis of ultra-micro-indentation tests 793.1.1 The method to identify the local mechanical behavior of virgin and oxidized polymers 793.1.2 Identification of local mechanical behavior of virgin polymers 833.1.3 Identifying the local mechanical behavior of the oxidized polymer 873.2 Identification of inelastic strains of chemical origin by inverse analysis of matrix shrinkage in unidirectional OMCs 933.2.1 Method for identifying inelastic strains in virgin and oxidized OMCs 963.2.2 Identification of inelastic strains and calculation of stresses in virgin OMCs 983.2.3 Identification of inelastic strains in oxidized OMCs 1023.2.4 Validating the identification of inelastic strains of chemical origin 1053.2.5 Numerical simulation of stresses induced by thermo-oxidation in UD OMCs 1083.2.6 Rayleigh–Ritz approach for approximate computation of matrix shrinkage in OMCs 111Conclusion and Perspectives 119Bibliography 127Index 133