Experimental and numerical studies of initial cracking in CFRP cross-ply laminates

Okabe, Tomonaga; Imamura, Hiroki; Sato, Yasumoto; Higuchi, Ryo; Koyanagi, Jun; Talreja, Ramesh

doi:10.1016/j.compositesa.2014.09.020

Cited by 44 publications

(33 citation statements)

References 34 publications

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“…As the present paper is not a review, this model selection does not claim completeness. Most of the selected models use an elasto-plastic [7,[9][10][11] or visco-plastic [12,13,27,28] modeling approach for the pure resin material. Two micromechanical simulations based on a linear-elastic and isotropic material model of the matrix are represented [14,23].…”

Section: Prediction Quality Compared To Literature Modelsmentioning

confidence: 99%

“…As the micromechanical damage mechanism in transversally loaded UD plies is a key aspect of the damage of laminates, researchers have focused on the modeling of these phenomena in recent years (e.g., [5][6][7][8][9][10][11][12][13][14][15][16]). While having insight into the micro-scale damage mechanisms, micromechanical modeling is used for predicting the composite stiffnesses and strengths of FRP based on the known material behavior of the fibers and the matrix.…”

Section: Introductionmentioning

confidence: 99%

“…To predict the composite behavior, it thus seems relevant to incorporate both the nonlinearity as well as the tension/compression-asymmetry of the pure resin. For modeling these material characteristics, plasticity [7][8][9][10][11]25,26], visco-elasticity [15] and visco-plasticity [12,13,27,28] are used in recent micromechanical simulations of FRP. In addition to the plastic deformations [29,30], nonlinear-elastic and viscous effects also contribute to the stress-strain behavior of polymeric resins [15,28,29].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nonlinear-Elastic Orthotropic Material Modeling of an Epoxy-Based Polymer for Predicting the Material Behavior of Transversely Loaded Fiber-Reinforced Composites

Lüders

2020

J. Compos. Sci.

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Micromechanical analyses of transversely loaded fiber-reinforced composites are conducted to gain a better understanding of the damage behavior and to predict the composite behavior from known parameters of the fibers and the matrix. Currently, purely elastic material models for the epoxy-based polymeric matrix do not capture the nonlinearity and the tension/compression-asymmetry of the resin’s material behavior. In the present contribution, a purely elastic material model is presented that captures these effects. To this end, a nonlinear-elastic orthotropic material modeling is proposed. Using this matrix material model, finite element-based simulations are performed to predict the composite behavior under transverse tension, transverse compression and shear. Therefore, the composite’s cross-section is modeled by a representative volume element. To evaluate the matrix modeling approach, the simulation results are compared to experimental data and the prediction error is computed. Furthermore, the accuracy of the prediction is compared to that of selected literature models. Compared to both experimental and literature data, the proposed modeling approach gives a good prediction of the composite behavior under matrix-dominated load cases.

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Section: Prediction Quality Compared To Literature Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nonlinear-Elastic Orthotropic Material Modeling of an Epoxy-Based Polymer for Predicting the Material Behavior of Transversely Loaded Fiber-Reinforced Composites

Lüders

2020

J. Compos. Sci.

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“…In particular, intralaminar failure, including matrix failure and interfacial debonding, or interlaminar failure between neighboring laminae is more important than the final failure that comes with fiber breakage in CFRP structures under operation. Initiation and progress of transverse cracks, which are the main initial failure modes of CFRP laminates, have been analyzed by considering matrix failure and interfacial debonding (Okabe et al, 2011(Okabe et al, , 2015Koyanagi et al, 2014). It has been reported that such transverse crack tends to occur in a relatively low stress level and is strongly affected by interfacial properties between carbon fibers and a matrix resin.…”

Section: Introductionmentioning

confidence: 99%

Damage-property analysis of carbon fiber-reinforced plastic based on homogenization theory

Goto

Tomioka

Arai

2020

Mechanical Engineering Journal

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In this study, the damage-development behavior of carbon fiber-reinforced plastic (CFRP) laminates considering the nonlinear mechanical properties of a matrix resin was investigated through a numerical simulation based on a homogenization theory and continuum damage mechanics. A scalar damage variable was applied to elastoviscoplastic constitutive equations, following which, the constitutive equations were introduced into the homogenization theory for elasto-viscoplastic materials. Uniaxial tensile tests including unloading and reloading phases under several strain rates were performed using a specimen made of an epoxy resin. The damage-development behavior of the unidirectional CFRP laminates was then analyzed using the homogenization theory. From the numerical results, viscoplastic behavior was observed in the stress-strain curves, and the stress decreased drastically as the damage of the epoxy resin developed. The microscopic distributions showed that the failure initiated at the epoxy resin around the fibers arranged along the loading direction and progressed by connecting the high damage variable regions of the epoxy resin. Uniaxial tensile tests of the unidirectional CFRP laminates were also performed to validate the numerical results. The experimental fracture stresses were distributed between the maximum and minimum stresses at the failure starting points obtained from the numerical results. Thus, it was confirmed that the proposed numerical method could analyze the damage-development behavior of CFRP laminates.

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“…It is well known that edge effects in laminated composites may lead to unstable growth of ply cracks and delaminations [1][2][3][4][5]. In order to prevent/predict such damage mechanisms, it is essential that a reliable methodology is developed to determine accurately the three-dimensional (3D) stress/displacement states near free edges caused by the mismatch of elastic properties between layers.…”

Section: Introductionmentioning

confidence: 99%

Variational analysis of free-edge stress and displacement fields in general un-symmetric and thin-ply laminates under in-plane, bending and thermal loading

Hajikazemi

Paepegem

2018

Composites Part A: Applied Science and Manufacturing

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A variational approach based on the minimization of complementary energy is developed to determine accurately a complete solution for both free-edge stress and displacement distributions of a laminate with arbitrary lay-ups (possibly un-symmetric and made of thin plies) under combined in-plane, bending and thermal loading. The key idea is partitioning the total stresses/displacements in a laminate with free edges into unperturbed (without free edges) and unknown perturbation stresses/displacements caused by the presence of free edges. It enables the theory of variational stress-transfer to deal easily with both applied traction and displacement boundary conditions. A methodology is introduced to obtain displacement fields for a stress-based variational approach. The resulting stress and displacement fields exactly satisfy local equilibrium equations, strain-displacement relations together with all traction/displacement boundary and continuity conditions. By comparing the results with those obtained from the finite element method, the accuracy and computational efficiency of the developed model, is confirmed.

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Experimental and numerical studies of initial cracking in CFRP cross-ply laminates

Cited by 44 publications

References 34 publications

Nonlinear-Elastic Orthotropic Material Modeling of an Epoxy-Based Polymer for Predicting the Material Behavior of Transversely Loaded Fiber-Reinforced Composites

Nonlinear-Elastic Orthotropic Material Modeling of an Epoxy-Based Polymer for Predicting the Material Behavior of Transversely Loaded Fiber-Reinforced Composites

Damage-property analysis of carbon fiber-reinforced plastic based on homogenization theory

Variational analysis of free-edge stress and displacement fields in general un-symmetric and thin-ply laminates under in-plane, bending and thermal loading

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