Ply-Cracking Damage and Nonlinear Deformation of CFRP Cross-Ply Laminate

Tohgo, Keiichiro; Sugiyama, Yuji; Kawahara, Kazutomo

doi:10.1299/jsmea.45.545

Cited by 9 publications

(7 citation statements)

References 14 publications

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“…The ply-crack density means a number of ply-through cracks per 1cm length perpendicular to the fiber direction in each ply, and for 30˚ tensile tests it is converted from a number of cracks observed on the specimen edges. Features on the stress-strain relations and ply-cracking damage are almost the same as the results already reported in the references [10,11]. Under on-axis tension, the stress-strain relations are linear up to a knee-point corresponding to the initiation of ply-cracking in 90˚ plies, and then slightly nonlinear with evolution of the ply-cracking damage and delamination.…”

Section: Tensile Properties and Ply-cracking Damage Of Cross-ply Lamisupporting

confidence: 85%

“…Although the stress for ply-cracking initiation in each direction can be roughly predicted by the present method, the predictions are low in the 0.5-3ply, and high in the 2-12 ply and 2-18 ply as compared with the experimental results. This is attributed to that the residual stresses in cross-ply laminates created in the curing process are not considered in the present prediction, and that the present method can not take into consideration an influence of ply thickness, different from prediction based on the energy release rate criterion [10,11]. Fig.…”

Section: Tensile Properties and Ply-cracking Damage Of Cross-ply Lamimentioning

confidence: 91%

“…As the transverse cracking and splitting are caused by micro-scale damage along the fiber direction such as matrix cracking and debonding between fibers and matrix, they are referred to as ply-cracking in this article. Since the inhomogeneity and damage modes at meso-scale have a much greater influence on the mechanical performance of laminated composites, many investigations have been carried out on the ply-cracking damage and delamination [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Damage Behavior and Life Prediction in CFRP Cross-Ply Laminates under Fatigue Loading

Tohgo

Nakagawa

Araki

2008

JMMP

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This paper deals with fatigue damage and life prediction of CFRP cross-ply laminates. Fatigue tests are carried out on CFRP unidirectional and cross-ply laminates under the on-axis and off-axis directions. On the unidirectional laminate, fiber breakage and fiber-peeling develop before the final fracture under on-axis fatigue, while the final fracture suddenly occurs by cracking along the fiber direction under off-axis fatigue. On the cross-ply laminates, ply-cracking in 90° plies and fiber-peeling in 0° plies develop under on-axis fatigue, while ply-cracking and delamination lead to the final fracture under off-axis fatigue. Based on the comparison of damage behavior and S-N curves between unidirectional and cross-ply laminates, possibility of fatigue life prediction of CFRP cross-ply laminates is discussed.

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Section: Tensile Properties and Ply-cracking Damage Of Cross-ply Lamisupporting

confidence: 85%

Section: Tensile Properties and Ply-cracking Damage Of Cross-ply Lamimentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Damage Behavior and Life Prediction in CFRP Cross-Ply Laminates under Fatigue Loading

Tohgo

Nakagawa

Araki

2008

JMMP

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“…is coordinate at reference configuration, ij P is the first Piola-Kirchhoff stress and i f is external force. The nonlinear stress-strain relation of composite materials is represented by the nonlinear deformation theory shown by Tohgo et al [10].…”

Section: Theoretical Modeling Of Transversementioning

confidence: 99%

Numerical Simulation and Theoretical Modeling of Transverse Compressive Failure in Fiber Reinforced Composite Materials

Nadabe¹

2015

Proceedings of the International Conference on Logistics, Engineering, Management and Computer Science

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This study investigates numerical simulation and theoretical modeling of transverse compressive failure in fiber reinforced composite materials. Firstly, numerical simulation of transverse compressive failure is conducted in order to understand the physical mechanism of the transverse compressive failure. The simulated results show that multiple shear bands appear in the material, and one of the shear bands develop to the entire material, and the transverse compressive failure is formed in the material. The material strength is associated with the initiation of shear band in the material due to localized stress concentration. Based on the mechanism in the numerical simulation, the theoretical modeling of transverse compressive failure is implemented. The model shows that the critical stress value of the material is represented by fiber volume fraction, matrix Poisson's ratio, matrix yield stress and angle of shear band.

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“…P is the first Piola-Kirchhoff stress and i f is external force. The nonlinear stress-strain relation of composite materials is represented by the nonlinear deformation theory shown by Tohgo et al [8].…”

Section: A Equations Expressing Deformation Of Composite Materialsmentioning

confidence: 99%

Numerical Simulation and Theoretical Modeling of Longitudinal Compressive Failure in Fiber Reinforced Composite Materials

Nadabe

2014

Proceedings of the International Conference on Logistics, Engineering, Management and Computer Science

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This study investigates the numerical simulation and theoretical modeling of longitudinal compressive failure in fiber reinforced composite materials. Firstly the numerical simulation of longitudinal compressive failure is conducted. The simulated results show that at one moment of the loading, the localized deformation catastrophically appears in the material, and in this initiation of the localized deformation, the reduction of tangent shear stiffness plays an important role. Secondly the theoretical modeling of longitudinal compressive failure is implemented. A set of mathematical equations is obtained for the deformation of composite materials, and the mathematical solution of the equations is considered. There exists a state where arbitrariness appears in the solution of equations expressing deformation of composite materials, and it is indicated that the onset of arbitrariness in solution of equations expressing deformation of composite materials is closely related with the initiation of longitudinal compressive failure, and also related with the initiation of narrow localized band in the materials. Finally the numerical simulation is conducted for compressive failure in quasi-isotropic laminate. The localized deformation also appears in the laminate, and the simulated deformation of the material agrees with the microscope picture of the experimental result.

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Ply-Cracking Damage and Nonlinear Deformation of CFRP Cross-Ply Laminate

Cited by 9 publications

References 14 publications

Damage Behavior and Life Prediction in CFRP Cross-Ply Laminates under Fatigue Loading

Damage Behavior and Life Prediction in CFRP Cross-Ply Laminates under Fatigue Loading

Numerical Simulation and Theoretical Modeling of Transverse Compressive Failure in Fiber Reinforced Composite Materials

Numerical Simulation and Theoretical Modeling of Longitudinal Compressive Failure in Fiber Reinforced Composite Materials

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