Micro-CT investigation on fatigue damage evolution in short fibre reinforced polymers

Cosmi, Francesca; Bernasconi, A.

doi:10.1016/j.compscitech.2013.02.008

Cited by 81 publications

(57 citation statements)

References 25 publications

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“…X-ray micro-computed tomography (lCT) technique has been used to investigate damage mechanisms in various composite materials [14][15][16][17][18]. Thanks to its inherent 3D analysis capabilities, the damage mechanisms can be identified and quantified in the bulk material, though usually careful data treatments are needed such as to resolve the lower resolution of lCT voxel as compared to the damage size and the presence of artifacts [18][19][20]. All these previous works did not focus on the effects of relative humidity on the damage initiation and accumulation in reinforced thermoplastics.…”

Section: Introductionmentioning

confidence: 99%

In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity

Arif

Meraghni

Chemisky

et al. 2014

Composites Part B: Engineering

130

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. b s t r a c tDamage mechanisms of injection molded polyamide-66/short glass fiber 30 wt% composite (PA66/GF30) were analyzed using in situ SEM mechanical tests on specimens conditioned under three relative humidity contents (RH = 0%, 50% and 100%). The validity of these in situ analyses was confirmed by Xray micro-computed tomography (lCT) observations on tensile loaded specimens. Experimental results demonstrated that relative humidity (RH) conditions influence strongly the damage level and damage mechanisms. Indeed, for specimen with RH = 0%, damage initiation occurs at significantly higher load level than those in RH = 50% and RH = 100% specimens. The higher relative humidity condition also results in higher damage level. Damage chronologies have been proposed as damage initiation in the form of fiber-matrix debonding occurs at fiber ends and more generally at locations where fibers are close to each other due to the generation of local stress concentration (for all studied RH contents), and first fiber breakages occur (RH = 0%). These debonded zones further propagate through fiber-matrix interface (for all studied RH contents), and new fiber breakages develop (RH = 0%). At high relative flexural stress, matrix microcracks appear and grow regardless the RH contents. For RH = 100%, these microcracks are also accompanied by many matrix deformation bands. Subsequently, they lead to the damage accumulation and then to the final failure.

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Section: Introductionmentioning

confidence: 99%

In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity

Arif

Meraghni

Chemisky

et al. 2014

Composites Part B: Engineering

130

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“…The developed multiscale model is strongly physically based as it is designed to capture the damage mechanisms observed by in-situ SEM test and by µCT tomography [1,2,5]. The damage scenario can be numerically reproduced at the microscale.…”

Section: Resultsmentioning

confidence: 99%

“…As specified in introduction, damage mechanisms have been studied by the authors [1,2] and by Cosmi and Bernasconi [5]. The retained damage scenario includes three mechanisms: fibermatrix interfacial debonding, fiber breakage and matrix microcracking.…”

Section: Damage Mechanismsmentioning

confidence: 99%

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Micromechanical Fatigue Visco-Damage Model for Short Glass Fiber Reinforced Polyamide-66

Despringre

Chemisky

Gurny

et al. 2015

Proceedings of the TMS Middle East — Mediterranean Materials Congress on Energy and Infrastructure Systems (MEMA 2015)

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractThis work presents a micromechanical fatigue damage model developed for short glass fiber reinforced PA66. It has been developed to predict the high cycle fatigue behavior of PA66/GF30. The model is based on an extended Mori-Tanaka method which includes coated inclusions, matrix viscoelasticity and the evolution of micro-scale damage. The developed model accounts for the nonlinear matrix viscoelasticity and the reinforcement orientation. The description of the damage processes is based on the experimental investigation of damage mechanisms previously performed through in-situ SEM tests and X-ray micro-computed tomography observations. Damage chronologies have been proposed involving three different processes: interface debonding/coating, matrix micro-cracking and fiber breakages. Their occurrence strongly depends on the microstructure and the relative humidity. Each damage mechanism is introduced through an evolution law coupled to local stress fields. The developed model is implemented using a UMAT subroutine. Its experimental validation is achieved under stress or strain controlled fatigue tests.

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“…Void-ratio, -area, and -size of the air in cement asphalt emulsion composites were measured with using X-ray CT (Wang and Xiao, 2012). On the other hand, Cosmi and Bernasconi (2013) utilized micro-CT method to investigate the fatigue results for the polymers that were reinforced by short fiber. The description technique of fiber dispersion in 3D space by micro-CT imaging was observed Liu et al (2013), and they showed the influence of aggregate on fiber dispersion and spacing between fibers.…”

Section: Introductionmentioning

confidence: 99%

Investigation of mechanical properties of mortars with carbon fiber using multi slice computed tomography

Sola

Erdem

Bostancı

et al. 2017

rdlc

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Carbon fibers (CFs) in the cement mortars are used in order to improve characteristics properties of the composite materials such as mechanical properties. Moreover, the uniformity of fiber dispersion is significant aspect for improvement of the composites. Computed Tomography (CT) imaging is a fully nondestructive technique to view features in the interior of opaque solid objects to obtain digital information on their properties. In this study, firstly, flexural test was conducted were investigated for 4×4×16 cm samples incorporated with carbon fiber at 2-and 7-days curing. Secondly, the images that were obtained by using multi-slice CT technique. Finally, the compressive strength properties of the mortars mixed with carbon fiber were discussed. According to the test results, the dispersion and orientation of CFs in the samples have a remarkable impact on mechanical properties of the composites.Key words: Carbon fiber, computed tomography (CT), compressive strength, flexural strength. ResumenEn morteros de cemento se utilizan fibras de carbono (FC), para mejorar las propiedades características de los materiales compuestos, tales como propiedades mecánicas. Además, la uniformidad de la dispersión de fibras es un aspecto significativo para la mejora de los compuestos. La tomografía computarizada (CT) es una técnica completamente no destructiva, para observar características en el interior de objetos sólidos opacos, para obtener información digital sobre sus propiedades. En este estudio, en primer lugar, se llevó a cabo la prueba de flexión, utilizando 4 × 4 × 16 cm de muestras incorporadas con fibra de carbono en 2 y 7 días de curado. En segundo lugar, se obtuvieron imágenes mediante la técnica de torsión múltiple. Finalmente, se discutieron las propiedades de resistencia a la compresión de los morteros mezclados con fibra de carbono. De acuerdo con los resultados de la prueba, la dispersión y orientación de CFs en las muestras tienen un impacto notable en las propiedades mecánicas de los compuestos.Palabras clave: Fibra de carbono, tomografía computarizada (CT), resistencia a la compresión, resistencia a la flexión.168

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Micro-CT investigation on fatigue damage evolution in short fibre reinforced polymers

Cited by 81 publications

References 25 publications

In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity

In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity

Micromechanical Fatigue Visco-Damage Model for Short Glass Fiber Reinforced Polyamide-66

Investigation of mechanical properties of mortars with carbon fiber using multi slice computed tomography

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