Numerical Study and Experimental Validation of Effect of Varying Fiber Crack Density on Stiffness Reduction in CFRP Composites

Hiremath, Chandrashekhar; Senthilnathan, K.; Naik, N.K.; Guha, Anirban; Tewari, Ashish

doi:10.1007/s11665-018-3275-0

Cited by 6 publications

(7 citation statements)

References 16 publications

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“…The detailed finite element (FE) model has been described elsewhere. 4,42 Fiber crack density as obtained from the experiment 2 was used as input in the FEA. A fiber crack was introduced in the FE model by deleting a row of elements of the fiber.…”

Section: Resultsmentioning

confidence: 99%

“…d. Material properties of the fiber and matrix are taken from the literature. 4,47 e. The undamaged UD CFRP composite consists of long contiguous cylindrical fibers reinforced in polymer matrix. All fibers are oriented along the same direction.…”

Section: Discussionmentioning

confidence: 99%

“…Microstructural damages within the composite can be measured using various techniques. 2 Some research work has been carried out to predict properties of the carbon fiber reinforced polymer (CFRP) composite for a given microstructural damage state 3,4 using numerical and analytical methods. Stiffness is one of the important properties that need to be predicted to understand the structural response of the damaged composite.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructural damage based micromechanics model to predict stiffness reduction in damaged unidirectional composites

Hiremath

Senthilnathan

Naik

et al. 2018

Journal of Reinforced Plastics and Composites

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Prediction of the residual stiffness of the carbon fiber reinforced polymer composite, subjected to fatigue loading, can be performed using some of the phenomenological models. However, it is still a challenge to find the stiffness based on the known microstructural damage state (that was developed irrespective of the load history). In this work, two micromechanics-based models were developed to predict reduction in the stiffness of the damaged composite. Fiber crack density and interface debonding was used to define the microstructural damage state of the composite. These models account for the fiber crack density in the form of change in either geometry (equivalent ellipsoid model) or material property of the fiber (reduced stiffness model). The microstructural damage state in the unidirectional carbon fiber reinforced polymer composite, obtained from the on-axis tension–tension fatigue loading, was used to validate the models. The results from reduced fiber stiffness model were compared against experiment and finite element analysis for the given microstructural damage. The stiffness obtained using reduced fiber stiffness model was in good agreement with that obtained from the experiment. However, reduced fiber stiffness model underestimated reduction in stiffness compared to finite element analysis.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microstructural damage based micromechanics model to predict stiffness reduction in damaged unidirectional composites

Hiremath

Senthilnathan

Naik

et al. 2018

Journal of Reinforced Plastics and Composites

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“…Thus, the PDI model helps in determining fiber crack density in the unidirectional FRP composite subjected to the on-axis fatigue loading during the damage initiation phase. This microstructural damage parameter can further be used to predict the mechanical properties (stiffness degradation 31,32 or reduction in the thermal conductivity 33 ) of the damaged composite. This could also be used to predict the fatigue damages in the variable amplitude loading.…”

Section: Discussionmentioning

confidence: 99%

Mechanistic model for fiber crack density prediction in cyclically loaded carbon fiber-reinforced polymer during the damage initiation phase

Hiremath

Senthilnathan

Naik

et al. 2018

Journal of Composite Materials

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Prediction of the fiber crack density (as one of the microstructural damages) for unidirectional fiber-reinforced polymer composite under monotonic tensile load, using strength models, has been reported in the literature. However, the microstructural damage prediction for a fiber-reinforced polymer subjected to fatigue loading is still a challenge. In this work, a progressive damage initiation model was developed to predict the fiber crack density in carbon fiber-reinforced polymer composite subjected to fatigue loading. A stochastic model was used for modeling the fiber fatigue strength. Reduction in effective life of the fiber was modeled using linear Miner’s rule. Effect of fatigue strength parameters on fiber crack density was found to be considerable compared to the effect of interface shear strength. At a low number of cycles, fiber crack density obtained from the model was in good agreement with the experimentally measured fiber crack density.

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“…In the FEM, the representative unit cell (RUC) incorporated microstructural details to predict the mechanical behavior of the fiber reinforced composites. 25,26 However, the RUC model could not be used to simulate the double-notch shear test. Based on the microstructure geometry of the 3D orthogonal woven preform and the epoxy resin, the multi-scale (micro-, meso-, and macro-scale) geometrical models were established as shown in Figure 4.…”

Section: Multi-scale Geometrical Modelmentioning

confidence: 99%

The temperature effect on the inter-laminar shear properties and failure mechanism of 3D orthogonal woven composites

Fan

Liu

et al. 2020

Textile Research Journal

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Recent increases in the use of carbon fiber reinforced plastics, especially for high-temperature applications, has induced new challenges in evaluating their mechanical properties. The effects of temperature on the shear performance of 3-dimensional orthogonal and 2-dimensional plain woven composites were compared in this study through double-notch shear tests. A scanning electron microscope was employed to investigate the fiber/matrix interface properties to reveal the failure characteristics. The results showed that temperature had a visible impact on the inter-laminar shear strength (ILSS), deformation modes, and failure mechanism. The ILSS decreased as temperature increased, which was caused by the degradation of the matrix properties and fiber/matrix interface properties at high temperature. A finite element model was established to analyze the transient deformation process and the damage mechanism of the 3D orthogonal woven composite. This indicated that Z-binder yarns could improve the delamination resistance of 3D orthogonal woven composites, especially under high temperatures. The changes in failure modes of the 3D orthogonal woven composites was put down to thermal softening of the epoxy resin caused by high temperature and the undulation of the yarns.

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Numerical Study and Experimental Validation of Effect of Varying Fiber Crack Density on Stiffness Reduction in CFRP Composites

Cited by 6 publications

References 16 publications

Microstructural damage based micromechanics model to predict stiffness reduction in damaged unidirectional composites

Microstructural damage based micromechanics model to predict stiffness reduction in damaged unidirectional composites

Mechanistic model for fiber crack density prediction in cyclically loaded carbon fiber-reinforced polymer during the damage initiation phase

The temperature effect on the inter-laminar shear properties and failure mechanism of 3D orthogonal woven composites

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