Effect of Thermo-oxidation on the local mechanical behaviour of epoxy polymer materials for high temperature applications

Gigliotti, Marco; Minervino, Matteo; Lafarie-Frenot, M.C.; Grandidier, J.C.

doi:10.1016/j.mechmat.2016.07.003

Cited by 32 publications

(4 citation statements)

References 56 publications

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“…in a recent work [36] by the same group. However, the model has developed in small deformation setting, and no diffusion of oxygen has been considered.…”

mentioning

confidence: 84%

A thermodynamically consistent chemo-mechanically coupled large deformation model for polymer oxidation

Konica

Sain

2020

Journal of the Mechanics and Physics of Solids

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In this paper, we present a continuum-level thermodynamically consistent model for high temperature oxidation in polymers, that incorporates the coupling between diffusion, chemical reaction and large deformation behavior of polymers. The specific constitutive forms are derived based on the thermodynamic inequality conditions and the kinetics of the oxidative reactions are considered. Oxidative shrinkage has also been considered in the kinematics as an irreversible effect. Subsequently, the model is implemented in ABAQUS/Standard to analyze numerically the coupled diffusion-reaction behavior of polymers undergoing oxidation. Several numerical simulations are performed to understand the effect of various material parameters on the oxidative response. The model is capable of predicting the heterogeneous oxidation profile within a thick polymer sample. It can also track the growth of oxide layer in the case of a long-term thermo-oxidative aging process. The model can be used to simulate the oxidation process involving complex geometries (as fiber reinforced composites) fairly easily under various ambient conditions.

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“…in a recent work [36] by the same group. However, the model has developed in small deformation setting, and no diffusion of oxygen has been considered.…”

mentioning

confidence: 84%

A thermodynamically consistent chemo-mechanically coupled large deformation model for polymer oxidation

Konica

Sain

2020

Journal of the Mechanics and Physics of Solids

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“…An extension of this model can also be found in the literature, known as the three zone oxidation model, that emphasized in the heterogeneity of oxygen diffusion leading to an oxide zone formation followed by an active reaction zone and then an unoxidized core [70,81,82]. This heterogeneity in the degree of oxidation results in non-uniform mechanical properties and inhomogeneous stress/strain distribution within an oxidized polymer [46,47,81]. In the similar trend, a diffusion-limited oxidation (DLO) model is also introduced to predict oxidation within a thick polymer sample [20,21].…”

Section: Introductionmentioning

confidence: 98%

“…Recently, a micro-mechanical model based on the competition between chain-scission and crosslinking events occurring at the polymer network during oxidation was reported to predict the changes in the constitutive behavior of polymers by [66]. On the other hand, a thermodynamically consistent continuum model to predict the constitutive response based on high-temperature oxidation behavior was found in the work of [46,47].…”

Section: Introductionmentioning

confidence: 99%

Micromechanically informed reaction-induced damage and fracture in polymers due to oxidation

Konica¹,

Sain²

2020

Preprint

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High temperature oxidation in polymers is a complex phenomenon, driven by the coupled diffusion-reaction process, causing changes in the amorphous network structure and resulting in property degradation. Prolonged oxidation in polymers results in the formation of a coarse, oxide layer on the outer surface and induces spontaneous cracking inside the material. In this paper, we present a chemical reaction-driven evolving network theory coupled with phase-field fracture to describe the effect of oxidation in polymers across different length scales. The theory considers the coupling between oxygen diffusion, chemical reactions, large deformation of polymers, and phase-field fracture in a thermodynamically consistent way. Guided by the statistical mechanics, the network theory has been introduced to model the reaction induced chain scissions and crosslinking events causing significant changes in the three-dimensional network structure. Further, these microscale events have been considered as the reason behind macroscopic mechanical property degradation, namely oxidative embrittlement. Finally the network theory is coupled with a phase-field fracture model to capture the macroscale damage and fracture in the polymer under stress-coupled oxidation conditions. We derive the specific constitutive forms for all the physical-chemical processes based on the thermodynamic inequality conditions, and numerically implement the theory in finite elements by writing ABAQUS user-defined element (UEL) subroutine. To present the model's capability, numerical examples with standard fracture geometries have been studied. The simulation results have demonstrated the model's capability of predicting the effect of oxidative aging on the polymer's response.

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“…thermal fatigue effects) is still under investigation. 4–9 In this context, one of the main damage mechanisms is the material cracking caused by thermal cycles. 10–12 The studies, 13,14 which analyze the influence of oxidative environment on the damage development, suggest that a coupled mechanism exists between: (i) the epoxy matrix oxidation at high temperatures, and (ii) thermal fatigue due to different coefficients of thermal expansion (CTE) within the composite system.…”

Section: Introductionmentioning

confidence: 99%

Simulation of thermal cycle aging process on fiber-reinforced polymers by extended finite element method

González

Laera

Koussios

et al. 2017

Journal of Composite Materials

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The simulation of long life behavior and environmental aging effects on composite materials are subjects of investigation for future aerospace applications (i.e. supersonic commercial aircrafts). Temperature variation in addition to matrix oxidation involves material degradation and loss of mechanical properties. Crack initiation and growth is the main damage mechanism. In this paper, an extended finite element analysis is proposed to simulate damage on carbon fiber reinforced polymer as a consequence of thermal fatigue between −50℃ and 150℃ under atmospheres with different oxygen content. The interphase effect on the degradation process is analyzed at a microscale level. Finally, results are correlated with the experimental data in terms of material stiffness and, hence, the most suitable model parameters are selected.

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Effect of Thermo-oxidation on the local mechanical behaviour of epoxy polymer materials for high temperature applications

Cited by 32 publications

References 56 publications

A thermodynamically consistent chemo-mechanically coupled large deformation model for polymer oxidation

A thermodynamically consistent chemo-mechanically coupled large deformation model for polymer oxidation

Micromechanically informed reaction-induced damage and fracture in polymers due to oxidation

Simulation of thermal cycle aging process on fiber-reinforced polymers by extended finite element method

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