Buckling and delamination growth behavior of composite laminates with circular initial delamination

Endalew, Abebaw Molla; Woo, Kyeongsik; Kim, In-Gul; Choi, Dongsu; Kim, Hwa-Su

doi:10.1007/s12206-021-0527-y

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…In the simulation, it can be clearly seen that near the inflection point of the load-displacement curve, the delamination expansion caused by local buckling begins to occur, which further verifies the conclusion given by the experiment. As the load gradually increases, the delamination gradually extends along the direction perpendicular to the load, which is consistent with the conclusions of [38,39].…”

Section: Resultssupporting

confidence: 89%

“…To predict the delamination evolution, the interface between two sub-laminates is modeled by 8-nodes 3D cohesive elements (COH3D8). The volume thickness of the cohesive element is zero, and the bilinear traction-separation law has been employed herein (refer to [39]). In Figure 9, the left side of the laminate is completely fixed (U x,y,z = 0), and the compressive displacement is applied to the right side (U y,z = 0).…”

Section: Finite Element Simulationsmentioning

confidence: 99%

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Identification of Multiple Mechanical Properties of Laminates from a Single Compressive Test

et al. 2022

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In-plane elastic and interlaminar properties of composite laminates are commonly obtained through separate experiments. In this paper, a simultaneous identification method for both properties using a single experiment is proposed. The mechanical properties of laminates were treated as uncertainties and Bayesian inference was employed with measured strain-load curves in compression tests of laminates with embedded delamination. The strain–load curves were separated into two stages: the pre-delamination stage and the post-delamination stage. Sensitivity analysis was carried out to determine the critical properties at different stages, in order to alleviate the ill-posed problem in inference. Results showed that the in-plane Young’s modulus and shear modulus in elastic properties are dominant in the pre-delamination stage, and the interlaminar strength and type I fracture toughness in interlaminar properties are dominant in the post-delamination stage. Five times of property identification were carried out; the maximum coefficient of variation of identified properties was less than 1.11%, and the maximum error between the mean values of the identified properties and the ones from standard experiments was less than 5.44%. The proposed method can reduce time and cost in obtaining multiple mechanical properties of laminates.

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Section: Resultssupporting

confidence: 89%

Section: Finite Element Simulationsmentioning

confidence: 99%

Identification of Multiple Mechanical Properties of Laminates from a Single Compressive Test

et al. 2022

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“…Various failure mechanisms can affect composite structures during manufacturing due to design errors or overheating or during service due to static overload, shock, and fatigue. Common defects in composites are fiber failure, buckling, matrix cracking, and delamination [6][7][8][9][10]. If these defects are not detected in composite materials, they can lead to catastrophic structural failure.…”

Section: Introductionmentioning

confidence: 99%

Delamination Localization in Multilayered CFRP Panel Based on Reconstruction of Guided Wave Modes

Papanaboina,

Jasiuniene,

Samaitis

et al. 2023

Applied Sciences

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Multi-layered composite materials are being used in various engineering fields, such as aerospace, automobile, and wind energy, because of their superior material properties. Due to various impact loads during the service life of composite structures, different types of defects can occur, such as matrix cracking, fiber breakage, delaminations, etc. In this research, a novel SHM technique for delamination detection and localization using a minimum number of sensors is proposed. The analytical, numerical, and experimental analysis of GW was performed to increase the probability of detection and localization of delaminations in CFRP material. A new analytical model was developed, which enables identifying converted and transmitted modes in the presence of multiple GW modes. A 2D FFT-based spatial filtering was used to filter the GW modes. The dominant A0 mode was separated to inspect the delamination. Phase velocity is one of the important features in GW inspection to localize the delamination. A phase spectrum approach was developed to reconstruct the phase velocity dispersion of the GW modes in case material properties are unknown.

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Delamination failure analysis of wind turbine blades based on equivalent fatigue load

Li,

Xin,

et al. 2024

Ocean Engineering

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Buckling and delamination growth behavior of composite laminates with circular initial delamination

Cited by 4 publications

References 27 publications

Identification of Multiple Mechanical Properties of Laminates from a Single Compressive Test

Identification of Multiple Mechanical Properties of Laminates from a Single Compressive Test

Delamination Localization in Multilayered CFRP Panel Based on Reconstruction of Guided Wave Modes

Delamination failure analysis of wind turbine blades based on equivalent fatigue load

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