Sharp indentation behavior of carbon/carbon composites and varieties of carbon

Diss, Pascal; Lamon, Jacques; Carpentier, Luc; Loubet, Jean‐Luc; Kapsa, Ph.

doi:10.1016/s0008-6223(02)00169-0

Cited by 64 publications

(57 citation statements)

References 18 publications

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“…The complete set of parameters, both measured averages labeled by * and those adopted from the literature, is available in Table 1. Note that the matrix modulus agrees relatively well with the one found for the glassy carbon in [8].…”

Section: Phase Elastic Moduli From Nanoindentationsupporting

confidence: 84%

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Material characterization and modeling of carbon–carbon textile composites

Vorel¹,

cek²,

Sejnoha³

2010

WIT Transactions on the Built Environment

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Material modeling plays an irreplaceable role in assessing the practical applicability of any type of material system. A successful approach requires with no doubt a combination of experimental measurements with predictive numerical simulations. While numerical simulations of complex heterogeneous materials often rely on the well established concept of the statistically equivalent periodic unit cell, its formulation for complex material systems, such as carbon-carbon (C/C) composites, is far from trivial, particularly in view of a hardly negligible intrinsic porosity of these material systems. Here reliable information about the actual size, shape and distribution of pores in the composite are provided using X-Ray microtomography combined with two-dimensional images of composite sections. Similarly, difficulties arise when searching for reliable material data of individual constituents. Although usually supplied by the manufacturer, the material properties of individual constituents may significantly deviate from these values when introduced into the composite. To add credibility to numerical predictions the properties derived from nanoindentation tests performed directly on the composite are adopted. The proposed synergy of experimental and numerical modeling is exploited here to provide estimates of the elastic stiffnesses of porous multilayer C/C composites with imperfect microstructure.

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Section: Phase Elastic Moduli From Nanoindentationsupporting

confidence: 84%

“…A successful application of nanoindentation to C/C composites has been reported in [8]. In the present study, our only attention was limited to the evaluation of the matrix elastic modulus and the transverse elastic modulus of the fiber.…”

Section: Phase Elastic Moduli From Nanoindentationmentioning

confidence: 98%

Material characterization and modeling of carbon–carbon textile composites

Vorel¹,

cek²,

Sejnoha³

2010

WIT Transactions on the Built Environment

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“…It is useful to compare the elastic constants of PyCs with those of graphite, which vary from %1 TPa in the basal direction (C 11 ) to %25 GPa in the transverse c direction (C 33 ). Experimental estimations of the transverse Young modulus obtained for high-textured PyCs are usually rather close to graphite's C 33 [6,8,9,7]. This is however usually not the case of in-plane properties.…”

Section: Introductionmentioning

confidence: 71%

“…Nevertheless, a few studies report on the elastic properties of such PyCs as obtained by acoustic methods [6,7], micro and nano indentation [8,9] or uniaxial tension/compression tests [10,11]. High textured PyCs are isotropically transverse materials with a supposed high anisotropy of properties.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, C 11 constants obtained using acoustic methods are in the range 40-50 GPa [6,7]; indentation moduli are around 10-30 GPa, i.e. lower or equal to the transverse values [8,12]; longitudinal moduli from tensile/compression tests show values ranging from around 20 GPa [11] as-prepared PyCs [10] and up to 400 GPa when heat treated at high temperature (2200°C) [10].…”

Section: Introductionmentioning

confidence: 99%

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Nanoscale elasticity of highly anisotropic pyrocarbons

Farbos

Costa

Vignoles

et al. 2015

Carbon

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On the ability of nanoindentation to measure anisotropic elastic constants of pyrolytic carbon

et al. 2012

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We used cube corner, Berkovich, cono-spherical, and Vickers indenters to measure the indentation modulus of highly oriented bulk pyrolytic carbon both normal to and parallel to the plane of elastic isotropy. We compared the measurements with elastic constants previously obtained using strain gage methods and ultrasound phase spectroscopy. While no method currently exists to extract the anisotropic elastic constants from the indentation modulus, the method of Delafargue and Ulm (DU) [17] was used to predict the indentation modulus from the known elastic constants. The indentation modulus normal to the plane of isotropy was ∼ 20% higher than the DU predictions and was independent of indenter type. The indentation modulus parallel to the plane of isotropy was 2-3 times lower than DU predictions, was depth dependent, and was lowest for the cube corner indenter. We attribute the low indentation modulus to nanobuckling of the graphite-like planes and the indenter type dependence to the impact of differing degree of transverse stress on the tendency toward nanobuckling.

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Sharp indentation behavior of carbon/carbon composites and varieties of carbon

Cited by 64 publications

References 18 publications

Material characterization and modeling of carbon–carbon textile composites

Material characterization and modeling of carbon–carbon textile composites

Nanoscale elasticity of highly anisotropic pyrocarbons

On the ability of nanoindentation to measure anisotropic elastic constants of pyrolytic carbon

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