In-situ tensile tests under SEM and X-ray computed micro-tomography aimed at studying a self-healing matrix composite submitted to different thermomechanical cycles

Bertrand, Rémi; Caty, Olivier; Mazars, Vincent; Denneulin, Sébastien; Weisbecker, Patrick; Pailhès, Jérôme; Camus, Gérald; Rebillat, F.

doi:10.1016/j.jeurceramsoc.2017.03.067

Cited by 18 publications

(11 citation statements)

References 10 publications

(6 reference statements)

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“…The most sensitive component is the pyrocarbon coating, which undergoes active oxidation above 500 • C [27]. At temperatures between 450 • C and about 700 • C, typical of civil craft engine operating conditions, the oxidation of the boron carbide matrix component is efficient enough to fill active cracks with a liquid boron oxide [28,29]. This is caused by the higher molar volume of the oxide compared to the carbide.…”

Section: Phenomena and Scalesmentioning

confidence: 99%

Image-Based Numerical Modeling of Self-Healing in a Ceramic-Matrix Minicomposite

Perrot

Couégnat

Ricchiuto³

et al. 2019

Ceramics

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Self-healing, obtained by the oxidation of a glass-forming phase, is a crucial phenomenon to ensure the lifetime of new-generation refractory ceramic-matrix composites. The dynamics of oxygen diffusion, glass formation and flow are the basic ingredients of a self-healing model that has been developed here in 2D in a transverse crack of a mini-composite. The presented model can work on a realistic image of the material section and is able to simulate the healing process and to quantify the exposure of the material to oxygen: a prerequisite for its lifetime prediction. Crack reopening events are handled satisfactorily, and healing under cyclic loading can be simulated. This paper describes and discusses a typical case in order to show the model capabilities.

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Section: Phenomena and Scalesmentioning

confidence: 99%

Image-Based Numerical Modeling of Self-Healing in a Ceramic-Matrix Minicomposite

Perrot

Couégnat

Ricchiuto³

et al. 2019

Ceramics

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“…The specific challenge in realizing a climate-controlled environment is attaining high enough temperature and relative humidity range within acceptable error bounds, which requires sufficient isolation to minimize any losses. Betrand et al [7] and Buffiere et al [4] used a copper induction coil to heat up the sample, however, this is not applicable for isolators and biological materials. It would suffice to minimize the design proposed by Case et al [8], in which the temperature and relative humidity from the sensors are used as an input for a feedback control loop for the heating elements.…”

Section: Conceptual Design and Realisationmentioning

confidence: 99%

“…Obviously, convenience lies with an in-situ approach, where the intrinsic 3D deformation can directly be linked to the mechanical response. To this end, a number of in-situ (thermo-)mechanical test devices have been developed [3][4][5][6][7][8][9][10], each with different limits and choices in terms of loading modes (tension, compression, bending, creep, etc. ), load and deformation range and resolution, CT resolution and, for some devices, temperature and/or relative humidity range.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, the mechanical loading device of Buffiere et al [4], addressed above, also includes induction heating up to 1500 • C, which is only suited for conducting samples. Bertrand et al [7] created their own thermomechanical loading device and used it to test the selfhealing properties of carbon-coated SiC fibre composites, by alternating mechanical loading and conduction heating to 800 • C. Finally, Case et al [8] developed, for in-situ X-ray diffraction analysis, a compact combined relative humidity -temperature chamber, to investigate the phase behaviour of aligned DNA fibres as a function of hydration, in which they added a so-called 'DNA strand puller' that was designed specifically for very delicate samples, whereas no force measurement was realized; more importantly, the setup is only transparent to X-rays at limited rotation angles, which is sufficient for X-ray diffraction but not for X-ray CT.…”

Section: Introductionmentioning

confidence: 99%

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A Multi-loading, Climate-Controlled, Stationary ROI Device for In-Situ X-ray CT Hygro-Thermo-Mechanical Testing

et al. 2018

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In-situ CT mechanical testing yields a full 3D description of a sample material's behaviour under specific loads. In the literature various devices are proposed which enable in-situ CT hygro-, thermo-or mechanical testing, each with its own merits and limitations. However none of them is able to perform advanced hygro-thermo-mechanical tests on specimens subjected to multiple loading modes, while accurately controlling and measuring the force, displacement, temperature and relative humidity in real time. Therefore, this work proposes an in-situ CT device which allows such multi-faceted experiments. Improvements to the current state-of-the-art devices include: (1) a compact, lightweight and rotationally symmetric design that enables high-resolution CT scans by minimization of wobble during scanning, in practically all labscale CT scanners; (2) a stationary region of interest by loading the sample from both sides, which enables high resolution CT characterization of materials exhibiting a large fracture strain; and (3) improved testing modularity by exchanging clamping methods to allow samples of various sizes (e.g., circular or rectangular) to be inserted in a variety of ways, thereby facilitating complex experiments such as three-or four-point bending tests. Validation experiments demonstrate that stringent requirements on CT resolution, loading and displacement accuracy and climate control are met. Furthermore, the in-situ testing capabilities of the device were validated by CT characterization of the creasing and folding process of multi-layer cardboard under varying (controlled) levels of relative humidity and temperature.

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“…However, although the environmental conditions influence, mainly oxidation in the case of PP‐based composites, on the mechanical and physical properties have been investigated for many years and well understood , few studies were realized on the thermal aging influence on the local damage mechanisms of CFs‐reinforced polymer. Some of previous papers dealing with oxidation effect on in situ damage investigation have shown that the generation of micro‐cracks creates paths for oxygen to penetrate through the fiber–matrix interface. Thus the interface is oxidized and the material lifetime is consequently reduced.…”

Section: Introductionmentioning

confidence: 99%

Thermal aging influence on the damage mechanisms of fully recycled composite‐reinforced polypropylene/polyethylene blend

et al. 2019

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The main aim of this work is to study the effect of thermal aging on damage mechanisms of a totally recycled composite. The studied material was elaborated by injection molding from a mixture of both recycled matrix (polypropylene‐polyethylene blend) and reinforcement (short carbon fibers). Damage mechanisms analysis was carried out using scanning electron microscope (in situ three point bending tests performed on specimens taken at different times of oxidation under different temperatures: 120, 130, and 140°C. Damage mechanisms were identified for different material states. It was shown that thermal aging affects the fiber–matrix interfacial zone while good adhesion between the reinforcement and the matrix was observed for the virgin sample. Furthermore, a quantitative analysis was performed at the local scale in a representative zone of the tensile area. Representative local damage indicators were defined. Results display clearly that damage evolutions always begin during the induction period. Thermal aging effect was then analyzed through the comparison of damage thresholds and kinetics for different material states after different times of oxidation. POLYM. COMPOS., 40:3342–3350, 2019. © 2019 Society of Plastics Engineers

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In-situ tensile tests under SEM and X-ray computed micro-tomography aimed at studying a self-healing matrix composite submitted to different thermomechanical cycles

Abstract: Sébastien Denneulin, et al.. In-situ tensile tests under SEM and X-ray computed micro-tomography aimed at studying a self-healing matrix composite submitted to different thermomechanical cycles.

Cited by 18 publications

References 10 publications

Image-Based Numerical Modeling of Self-Healing in a Ceramic-Matrix Minicomposite

Image-Based Numerical Modeling of Self-Healing in a Ceramic-Matrix Minicomposite

A Multi-loading, Climate-Controlled, Stationary ROI Device for In-Situ X-ray CT Hygro-Thermo-Mechanical Testing

Thermal aging influence on the damage mechanisms of fully recycled composite‐reinforced polypropylene/polyethylene blend

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