Characterization and modeling of microcracking and elastic moduli changes in nicalon/cas composites

Karandikar, Prashant; Chou, Tsu‐Wei

doi:10.1016/0266-3538(93)90159-e

Cited by 90 publications

(34 citation statements)

References 7 publications

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“…[3] Thinner 908 layers have higher constraint due to the adjacent stiff 08 layers and show crack initiation at higher strains and a larger saturation density of cracks before failure. [4] Electrical resistance measurements have been widely used to detect damage in carbon-fiber-reinforced composites. [5][6][7][8][9][10][11][12] For instance, Wang and Chung monitored the static/fatigue damage and dynamic strain in cross-ply carbon fiber polymer matrix composites using direct current measurement techniques.…”

Section: Introductionmentioning

confidence: 99%

Sensing of Damage Mechanisms in Fiber‐Reinforced Composites under Cyclic Loading using Carbon Nanotubes

Gao

Thostenson

Zhang

et al. 2008

Adv Funct Materials

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206

113

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The expanded use of advanced fiber‐reinforced composites in structural applications has brought attention to the need to monitor the health of these structures. It has been established that adding carbon nanotubes to fiber‐reinforced composites is a promising way to detect the formation of microscale damage. Because carbon nanotubes are three orders of magnitude smaller than traditional advanced fibers, it is possible for nanotubes to form an electrically conductive network in the polymer matrix surrounding the fibers. In this work, multi‐walled carbon nanotubes are dispersed into epoxy and infused into a glass‐fiber preform to form a network of in situ sensors. The resistance of the cross‐ply composite is measured in real‐time during incremental cyclic tensile loading tests to evaluate the damage evolution and failure mechanisms in the composite. Edge replication is conducted to evaluate the crack density after each cycle, and optical microscopy is utilized to study the crack mode and growth. The evolution of damage can be clearly identified through the damaged resistance parameter. Through analyzing the damaged resistance response curves with measurements of transverse crack density and strain, the transition between different failure modes can be identified. It is demonstrated that the integration of an electrically conducting network of carbon nanotubes in a glass fiber composite adds unique damage‐sensing functionality that can be utilized to track the nature and extent of microstructural damage in fiber composites.

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Section: Introductionmentioning

confidence: 99%

Sensing of Damage Mechanisms in Fiber‐Reinforced Composites under Cyclic Loading using Carbon Nanotubes

Gao

Thostenson

Zhang

et al. 2008

Adv Funct Materials

Self Cite

206

113

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“…E i which has been derived by Karandikar and Chou by using the shearlag model can be obtained by [42] …”

Section: Prediction Of Residual Stinessmentioning

confidence: 99%

Fatigue crack initiation and multiplication of unnotched titanium matrix composites

1998

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AbstractÐFatigue crack initiation and multiplication of the unnotched SCS-6 silicon carbide ®ber-reinforced titanium matrix composites with dierent matrix and interfacial properties have been investigated experimentally and analytically. Ti±15V±3Al, Ti±6Al±4V, and Ti±22Al±23Nb were chosen as matrix materials. The initiation and propagation of each individual matrix crack as a function of fatigue cycles and applied stress levels were carefully monitored. The statistical distribution of crack growth rates in each composite has been constructed and analyzed. The evolution of normalized matrix crack density and stiness reduction of these composites under fatigue loading also has been characterized. A modi®ed shear-lag model, coupled with the strain-life equation and a ®ber bridging model were used to predict the fatigue crack initiation life, matrix crack growth rate, normalized matrix crack density, and residual stiness of the composites. The predicted fatigue properties correlated well with experimental results. #

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“…Such curvature is essentially resulted from the transverse cracking in the matrix. The cracks are arrested by the fibers and they are deflected at the fiber/matrix interfaces causing fiber debonding [8,9]. The misaligned fibers in the spunyarn of spun-type composites play an important role in suppressing delamination due to the effect of fiber bridging as supplementary reinforcement [10].…”

Section: Resultsmentioning

confidence: 99%

Strengthening effect of the misaligned fibers on high-temperature mechanical properties of spun-yarn type carbon composites

Park

Lee

Won

2008

Composites Science and Technology

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Characterization and modeling of microcracking and elastic moduli changes in nicalon/cas composites

Cited by 90 publications

References 7 publications

Sensing of Damage Mechanisms in Fiber‐Reinforced Composites under Cyclic Loading using Carbon Nanotubes

Sensing of Damage Mechanisms in Fiber‐Reinforced Composites under Cyclic Loading using Carbon Nanotubes

Fatigue crack initiation and multiplication of unnotched titanium matrix composites

Strengthening effect of the misaligned fibers on high-temperature mechanical properties of spun-yarn type carbon composites

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