Micro-computed tomography analysis of tubular braided composites

Melenka, Garrett W.; Lepp, Eric; Cheung, Benjamin; Carey, Jason P.

doi:10.1016/j.compstruct.2015.05.057

Cited by 51 publications

(31 citation statements)

References 32 publications

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“…Through synchrotron micro-CT analysis of an RTM quasi-UD NCF carbon/epoxy composite by Sisodia et al, 48 the volume of voids was found to be within 10-1000 mm 3 and suggested a bell-shape distribution. Melenka et al 190 fitted the void volume distribution for a Kevlar/epoxy braided composite, measured through micro-CT, by a Weibull distribution, as presented in Figure 17. The mean void volume, obtained through the Weibull distribution was 7.4 Â 10 6 mm 3 with a variance of 7.3 Â 10 4 mm 3 .…”

Section: Void Sizementioning

confidence: 99%

Voids in fiber-reinforced polymer composites: A review on their formation, characteristics, and effects on mechanical performance

Mehdikhani

Gorbatikh

Verpoest

2018

Journal of Composite Materials

550

305

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Voids, the most studied type of manufacturing defects, form very often in processing of fiber-reinforced composites. Due to their considerable influence on physical and thermomechanical properties of composites, they have been extensively studied, with the focus on three research tracks: void formation, characteristics, and mechanical effects. Investigation of voids in composites started around half a century ago and is still an active research field in composites community. This is because of remaining unknowns and uncertainties about voids as well as difficulties in their suppression in modern manufacturing techniques like out-of-autoclave curing and parts with high complexity, further complicated by increased viscosity of modified resins. Finally, this is because of the increasing interest in realization of more accurate void rejection limits that would tolerate some voidage. The current study reviews the research on formation, characterization, and mechanical effects of voids, which has been conducted over the past five decades. Investigation and control of void formation, using experimental and modeling approaches, in liquid composite molding as well as in prepreg composite processing are surveyed. Techniques for void characterization with their advantages and disadvantages are described. Finally, the effect of voids on a broad range of mechanical properties, including inter-laminar shear, tensile, compressive, and flexural strength as well as fracture toughness and fatigue life, is appraised. Both experimental and simulation approaches and results, concerning voids' effects, are reviewed.

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Section: Void Sizementioning

confidence: 99%

Voids in fiber-reinforced polymer composites: A review on their formation, characteristics, and effects on mechanical performance

Mehdikhani

Gorbatikh

Verpoest

2018

Journal of Composite Materials

550

305

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“…To facilitate the visualization and manipulation of the stress field in the tubular composite, we first remap the fields of stress components and, in particular, of the maximum principal stress from the tubular geometry to a rectangular parallelepiped one. This unwrapping procedure is the same as that proposed by [67,68]. More precisely, the material point = ( cos , sin , ) in the tube is The stress field evaluated for a macroscopic applied strain of 1% has been rescaled so that the average axial stress matches the elastic limit (93 MPa) measured experimentally (see stress-strain curve in Fig.1.b).…”

Section: Unwrapping and Rescaling Of Stress Fieldmentioning

confidence: 99%

Analysis of the damage initiation in a SiC/SiC composite tube from a direct comparison between large-scale numerical simulation and synchrotron X-ray micro-computed tomography

Chen

Gélebart

Chateau

et al. 2019

International Journal of Solids and Structures

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Analysis of the damage initiation in a SiC/SiC composite tube from a direct comparison between large-scale numerical simulation and synchrotron X-ray micro-computed tomography. AbstractDamage initiation is an important issue to understand the mechanical behavior of ceramic matrix composites. In the present work, a braided SiC/SiC composite tube was studied by FFT simulation tightly linked with micro-computed tomography (µCT) observations performed during an in situ uniaxial tensile test, which provide both the real microstructure, with a good description of local microstructural geometries, and location of cracks at the onset of damage. The FFT method was proven applicable to tubular structures and efficient to complete the large-scale simulation on a full resolution µCT scan (~6.7 billion voxels) within a short time. The edge effect due to the numerical periodic boundary conditions prescribed on the real and not rigorously periodic microstructure was quantified. The obtained stress field was compared to the cracks detected by the in situ µCT observations of the same composite tube. This one-to-one comparison showed that cracks preferentially initiated at tow interfaces, where sharp edges of macropores are mostly located and generate stress concentrations.

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“…Of great interest in this field, CT scan technology permits the evaluation of the microstructure of the composite material [47][48][49][50][51][52]. In many cases, the combined use of CT scan and mechanical or thermal characterization tests of the composite material allows relations to be established between the microstructure and its macroscopic response [53][54][55][56][57] (Figure 10).…”

Section: Use Of Ct Scan Technology In Compositesmentioning

confidence: 99%

“…The example of analysis of the microstructure of a composite[47]. (a) 3D braid geometry, (b) 3D braid geometry with imperfections, (c) 3D distribution imperfections, and (d) detailed view.…”

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The Use of Computed Tomography to Explore the Microstructure of Materials in Civil Engineering: From Rocks to Concrete

Vicente¹,

Mínguez²,

González³

2017

Computed Tomography - Advanced Applications

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Computed tomography (CT) is a nondestructive technique, based on absorbing X-rays, that permits the visualisation of the internal microstructure of material. The field of application is very wide. This is a well-known technology in medicine, because of its enormous advantages, but it is also very useful in other fields. Computed tomography is used in palaeontology to study the internal structure of the bones from ancient hominids. In addition, this technology is being used by engineers to analyse the microstructure of materials. Materials engineers use this technology to analyse or develop new materials. Mechanical engineers use CT scans to study the internal defects of materials. Geotechnical engineers use CT scans to study several aspects of the rocks and minerals (cracks, voids, etc). This technology is also very useful to study de microstructure of concrete, especially in case of the new concretes (ultra-high performance concrete, fiber reinforced concrete, etc). In this chapter, an extended state-of-the-art of the most relevant research, related to the use of computed tomography to explore the microstructure of materials in civil and mechanical engineering, is exposed. The main objective of this chapter is that the reader can discover new applications of the computed tomography, different from conventional ones.

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Micro-computed tomography analysis of tubular braided composites

Cited by 51 publications

References 32 publications

Voids in fiber-reinforced polymer composites: A review on their formation, characteristics, and effects on mechanical performance

Voids in fiber-reinforced polymer composites: A review on their formation, characteristics, and effects on mechanical performance

Analysis of the damage initiation in a SiC/SiC composite tube from a direct comparison between large-scale numerical simulation and synchrotron X-ray micro-computed tomography

The Use of Computed Tomography to Explore the Microstructure of Materials in Civil Engineering: From Rocks to Concrete

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