Effect of interfacial fibre orientation and PPS veil density on delamination resistance of 5HS woven CFRP laminates under mode II loading

Ramji, Amit; Xu, Yigeng; Grasso, Marzio; Yasaee, Mehdi; Webb, Philip

doi:10.1016/j.compscitech.2021.108735

Cited by 11 publications

(5 citation statements)

References 29 publications

(44 reference statements)

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“…In [ 8 ], resistance against delamination under Mixed-Mode loading (G II = 34%, 85%) was investigated for 0°//0°, 0°//22.5°, 0°//45°, and 0°//90° interfaces. More recent results of similar investigations can be found, e.g., in [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ], and in [ 19 , 20 , 21 , 22 ] where also R-curves were of interest.…”

Section: Introductionmentioning

confidence: 58%

Resistance of Polymeric Laminates Reinforced with Fabrics against the Growth of Delaminations

Czarnocki

2021

Materials

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Dependence of the initiation values of the Strain Energy Release Rate, GCi, on the orientation of the reinforcement direction α relative to the delamination front was investigated for two laminates of different interfacial ply arrangements. In the case of the first laminate, the delamination was located at the interface of the layers reinforced with symmetric fabric and unidirectional fabric. In the case of the second laminate, the delamination was located at the interface of layers reinforced with symmetric fabric. In both laminates, the orientation of fibers in the layers separated by the delamination differed by 45° regarding the warp directions. The investigations were carried out for Mode I, Mode II, and Mixed-Mode I/II (GII/GI = 1 and GII/GI = 1.7) loadings using hybrid beam specimens. The major problem appearing in the intended tests was the inevitable lack of symmetry in the xz and xy planes of the specimens and the resulting deformation and stress–strain couplings, causing undesired loading modes. To decrease these couplings, especially designed hybrid beam specimens were used. An auxiliary finite element analysis was performed to assess the remaining effects of the reduced couplings. To ascertain whether statistically significant differences between Gci values for different α occurred, the one-way analysis of variance supplemented by Levene’s test was carried out. The dependence of Gci on α was found out for both laminates. However, it was not equally strong, and it turned out that the loading mode and the interfacial ply were arrangement sensitive.

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Section: Introductionmentioning

confidence: 58%

Resistance of Polymeric Laminates Reinforced with Fabrics against the Growth of Delaminations

Czarnocki

2021

Materials

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“…The electrical resistance change method (ERCM) was reported to detect the damage of CFRP. [14][15][16][17][18][19] In previous studies, the ERCM has been used to detect cracking of laminate composites under tensile, 20 compression, 21 and bending. 22,23 Grammatikos and Paipetis 24 found that invisible crack caused the resistance to increase irreversibly under tensile.…”

Section: Introductionmentioning

confidence: 99%

“…Jiang and Li 13 found that interfacial shear stresses caused the change of interfacial structure, and led to the change of resistance between single fiber and matrix under tensile.The electrical resistance change method (ERCM) was reported to detect the damage of CFRP. [14][15][16][17][18][19] In previous studies, the ERCM has been used to detect cracking of laminate composites under tensile, 20 compression, 21 and bending. 22,23 Grammatikos and Paipetis 24 found that invisible crack caused the resistance to increase irreversibly under tensile.…”

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confidence: 99%

Electrical-mechanical behaviors of three-dimensional braided composites under three-point bending

Huang

Xue

et al. 2022

Textile Research Journal

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Electrical responses of three-dimensional braided composites under mechanical loads are important for the design of structural health monitoring in real time. Here we reported electrical properties and electrical-mechanical behaviors of three-dimensional braided composites with different braiding angles under three-point bending load, and investigated the correlation between electrical resistance and damage of the three-dimensional braided composites. We found that change of resistance reflected damage modes of the composite. In addition, we proposed an electrical-mechanical model to explain the resistance changes of three-dimensional braided composites based on the Weibull distribution function. The results of the model verify the effectiveness and rationality of the experimental results under bending load, which provides a theoretical basis for the structural health monitoring of three-dimensional braided composites through a electrical resistance change method.

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“…Barely visible impact damage (BVID) is a perception which often neglects the underlying damage introduced within the laminate [1]. Impact energy can be absorbed at any point of the laminate, sometimes far from the impact site due to the inherent material characteristics and brittle nature of fibers and matrix [2]. Although impacting at low energy, there can be various levels of laminate failure mechanisms during energy absorption, including, front face indentation, interlaminar delamination, back face splitting, and fiber peeling [3].…”

Section: Introductionmentioning

confidence: 99%

Threshold Identification and Damage Characterization of Woven GF/CF Composites under Low-Velocity Impact

Grasso

2022

J. Compos. Sci.

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The Delamination Threshold Load (DTL) is a key parameter representing damage resistance of a laminate and is normally identified by locating a sudden drop in the impact force-time history for the laminate made of unidirectional layers. For the woven composite, however, their failure mechanisms appear different and the current literature is not providing any clear procedure regarding the identification of the delamination initiation, as well as the evolution of the failure mechanisms associated with it. In this paper, experimental data have been collected using woven glass and carbon fiber composites. The results are analyzed in terms of force-time and force-displacement curves. While delamination and other damages were clearly observed using ultrasonic scans, the analysis of the results does not reveal any trend changes of the curves that can be associated with the incipient nucleation of delamination. A preliminary discussion regarding the nature of the mechanisms through which the delamination propagates in woven composite and a justification for the absence of a sudden change of the stiffness have been presented. It raises a question on the existence of DTL for woven composites under low velocity impact.

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Effect of interfacial fibre orientation and PPS veil density on delamination resistance of 5HS woven CFRP laminates under mode II loading

Cited by 11 publications

References 29 publications

Resistance of Polymeric Laminates Reinforced with Fabrics against the Growth of Delaminations

Resistance of Polymeric Laminates Reinforced with Fabrics against the Growth of Delaminations

Electrical-mechanical behaviors of three-dimensional braided composites under three-point bending

Threshold Identification and Damage Characterization of Woven GF/CF Composites under Low-Velocity Impact

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