Polarization-resolved terahertz imaging of intra- and inter-laminar damages in hybrid fiber-reinforced composite laminate subject to low-velocity impact

Dong, Junliang; Locquet, Alexandre; Declercq, Nico F.; Citrin, D. S.

doi:10.1016/j.compositesb.2016.02.016

Cited by 59 publications

(28 citation statements)

References 26 publications

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“…Hybridization provides new opportunities to broaden the applicability and improve the properties of composite materials, especially in high-end applications [3,7]. Hence, hybrid composites can provide a high stiffness and strength, improve the impact and fatigue resistance, provide high fracture toughness, and simultaneously cut the weight and/or total cost [66,67].…”

Section: Hemp Fiber-reinforced Hybrid Compositesmentioning

confidence: 99%

Industrial Hemp Fibers: An Overview

Manaia¹,

Manaia²,

Rodriges

2019

Fibers

167

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Industrial hemp (Cannabis sativa) is one of the most available and widely produced bast fibers with high cellulose content. Interest in these fibers is warranted due to environmental protection challenges as well as their inherent properties such as low density, high specific strength, and stiffness. In addition, advanced research and progress have gone into increasing their mechanical performance through surface treatments and in the development of new materials. The most promising application for hemp fibers is as reinforcement in polymeric composites or through hybridization. Nonetheless, more research is needed to improve their properties and expand their range of applications. The biodegradability issue is one problem that must be addressed when considering long life-cycle applications as the reproducibility of these composites’ final properties. This review is a comprehensive literature review on hemp fibers. It includes hemp fibers’ chemical and mechanical properties, surface modifications, hybrid composites, as well as current and future applications.

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Section: Hemp Fiber-reinforced Hybrid Compositesmentioning

confidence: 99%

Industrial Hemp Fibers: An Overview

Manaia¹,

Manaia²,

Rodriges

2019

Fibers

167

View full text Add to dashboard Cite

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“…Terahertz time-domain spectroscopy (THz-TDS) is a powerful tool for characterizing the internal optical responses of optically opaque polymer-based materials11121314151617181920212223242526. Because the photon energy of terahertz waves is relatively small in comparison to that of visible light, they possess high transmittance, which enables us to access the internal states of opaque polymeric materials.…”

mentioning

confidence: 99%

Anisotropic optical response of optically opaque elastomers with conductive fillers as revealed by terahertz polarization spectroscopy

Okano

Watanabe

2016

Sci Rep

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Elastomers are one of the most important materials in modern society because of the inherent viscoelastic properties due to their cross-linked polymer chains. Their vibration-absorbing and adhesive properties are especially useful and thus utilized in various applications, for example, tires in automobiles and bicycles, seismic dampers in buildings, and seals in a space shuttle. Thus, the nondestructive inspection of their internal states such as the internal deformation is essential in safety. Generally, industrial elastomers include various kinds of additives, such as carbon blacks for reinforcing them. The additives make most of them opaque in a wide spectral range from visible to mid-infrared, resulting in that the nondestructive inspection of the internal deformation is quite difficult. Here, we demonstrate transmission terahertz polarization spectroscopy as a powerful technique for investigating the internal optical anisotropy in optically opaque elastomers with conductive additives, which are transparent only in the terahertz frequency region. The internal deformation can be probed through the polarization changes inside the material due to the anisotropic dielectric response of the conductive additives. Our study about the polarization-dependent terahertz response of elastomers with conductive additives provides novel knowledge for in situ, nondestructive evaluation of their internal deformation.

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“…Although carbon fibers hinder the THz penetration, the interaction between the THz polarization and carbon fiber orientation can be utilized to extract detailed information which cannot be obtained by other NDE techniques. In our previous work [14], polarization-resolved THz imaging has been successfully applied to a hybrid fiber-reinforced composite laminate containing glass-fibers/ epoxy and carbon-fibers/epoxy plies with a cross-ply stack pattern. Impact-induced inter-ply damage at the interface and intra-ply damage close to the same interface can be differentiated by taking advantage of the sensitivity of THz polarization to the anisotropic conductivity of unidirectional carbon fibers.…”

Section: Introductionmentioning

confidence: 99%

Visualization of subsurface damage in woven carbon fiber-reinforced composites using polarization-sensitive terahertz imaging

Dong

Pomarède

Chehami

et al. 2018

NDT & E International

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Polarization-sensitive terahertz imaging is applied to characterize subsurface damage in woven carbon fiberreinforced composite laminates in this study. Terahertz subsurface spectral imaging based on terahertz deconvolution is tailored and applied to detect, in a nondestructive fashion, the subsurface damage within the first ply of the laminate caused by a four-point bending test. Subsurface damage types, including matrix cracking, fiber distortion/fracture, as well as intra-ply delamination, are successfully characterized. Our results show that, although the conductivity of carbon fibers rapidly attenuates terahertz propagation with depth, the imaging capability of terahertz radiation on woven carbon fiber-reinforced composites can nonetheless be significantly enhanced by taking advantage of the terahertz polarization and terahertz deconvolution. The method demonstrated in this study is capable of extracting and visualizing a number of fine details of the subsurface damage in woven carbon fiber-reinforced composites, and the results achieved are confirmed by comparative studies with X-ray tomography.

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Polarization-resolved terahertz imaging of intra- and inter-laminar damages in hybrid fiber-reinforced composite laminate subject to low-velocity impact

Cited by 59 publications

References 26 publications

Industrial Hemp Fibers: An Overview

Industrial Hemp Fibers: An Overview

Anisotropic optical response of optically opaque elastomers with conductive fillers as revealed by terahertz polarization spectroscopy

Visualization of subsurface damage in woven carbon fiber-reinforced composites using polarization-sensitive terahertz imaging

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