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R-curve behaviour of the mixed-mode I/II delamination in carbon/epoxy laminates with unidirectional and multidirectional interfaces

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R-curve behaviour of the mixed-mode I/II delamination in carbon/epoxy laminates with unidirectional and multidirectional interfaces. / Gong, Yu; Zhang, Bing; Zhao, Libin; Zhang, Jianyu; Hu, Ning; Zhang, Chuanzeng.

In: Composite Structures, Vol. 223, 110949, 01.09.2019.

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Gong, Yu ; Zhang, Bing ; Zhao, Libin ; Zhang, Jianyu ; Hu, Ning ; Zhang, Chuanzeng. / R-curve behaviour of the mixed-mode I/II delamination in carbon/epoxy laminates with unidirectional and multidirectional interfaces. In: Composite Structures. 2019 ; Vol. 223.

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@article{fe9f6db6f861489cb616d4d8d6ce0176,
title = "R-curve behaviour of the mixed-mode I/II delamination in carbon/epoxy laminates with unidirectional and multidirectional interfaces",
abstract = "To successfully predict the delamination behaviour of the laminated composite structures with fibre bridging, the R-curve has to be studied. This work experimentally investigates the complete R-curve behaviour of the unidirectional and multidirectional carbon/epoxy composite laminates. The delamination tests use the double cantilever beam (DCB), mixed-mode bending (MMB)and end-notched flexure (ENF)specimens for mode I, mixed-mode I/II and mode II loading, respectively. The test results show that the interfacial ply and mode mixity (φ-ratio)have significant influences on the initial fracture toughness, steady-state fracture toughness and fibre bridging length. The ratio between the steady-state fracture toughness and its initial value is approximately same for both interfaces, which indicates a similar enhanced effect of the fibre bridging on the fracture toughness. The Benzeggagh-Kenane (B-K)criterion is capable of representing the relation between the fracture toughness and the φ-ratio. Based on the DCB and MMB test results, the predicted values of the mode II fracture toughness via the B-K criterion are very close to the experimental ones, which illustrates the possibility of determining the mode II fracture toughness without executing the mode II delamination tests. Furthermore, a semi-empirical expression is proposed, which can well predict the mixed-mode I/II delamination behaviour.",
keywords = "Carbon fibre, Composite laminates, Delamination, R-curve",
author = "Yu Gong and Bing Zhang and Libin Zhao and Jianyu Zhang and Ning Hu and Chuanzeng Zhang",
year = "2019",
month = "5",
day = "4",
doi = "10.1016/j.compstruct.2019.110949",
language = "English",
volume = "223",
journal = "Composite Structures",
issn = "0263-8223",
publisher = "Elsevier",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - R-curve behaviour of the mixed-mode I/II delamination in carbon/epoxy laminates with unidirectional and multidirectional interfaces

AU - Gong, Yu

AU - Zhang, Bing

AU - Zhao, Libin

AU - Zhang, Jianyu

AU - Hu, Ning

AU - Zhang, Chuanzeng

PY - 2019/5/4

Y1 - 2019/5/4

N2 - To successfully predict the delamination behaviour of the laminated composite structures with fibre bridging, the R-curve has to be studied. This work experimentally investigates the complete R-curve behaviour of the unidirectional and multidirectional carbon/epoxy composite laminates. The delamination tests use the double cantilever beam (DCB), mixed-mode bending (MMB)and end-notched flexure (ENF)specimens for mode I, mixed-mode I/II and mode II loading, respectively. The test results show that the interfacial ply and mode mixity (φ-ratio)have significant influences on the initial fracture toughness, steady-state fracture toughness and fibre bridging length. The ratio between the steady-state fracture toughness and its initial value is approximately same for both interfaces, which indicates a similar enhanced effect of the fibre bridging on the fracture toughness. The Benzeggagh-Kenane (B-K)criterion is capable of representing the relation between the fracture toughness and the φ-ratio. Based on the DCB and MMB test results, the predicted values of the mode II fracture toughness via the B-K criterion are very close to the experimental ones, which illustrates the possibility of determining the mode II fracture toughness without executing the mode II delamination tests. Furthermore, a semi-empirical expression is proposed, which can well predict the mixed-mode I/II delamination behaviour.

AB - To successfully predict the delamination behaviour of the laminated composite structures with fibre bridging, the R-curve has to be studied. This work experimentally investigates the complete R-curve behaviour of the unidirectional and multidirectional carbon/epoxy composite laminates. The delamination tests use the double cantilever beam (DCB), mixed-mode bending (MMB)and end-notched flexure (ENF)specimens for mode I, mixed-mode I/II and mode II loading, respectively. The test results show that the interfacial ply and mode mixity (φ-ratio)have significant influences on the initial fracture toughness, steady-state fracture toughness and fibre bridging length. The ratio between the steady-state fracture toughness and its initial value is approximately same for both interfaces, which indicates a similar enhanced effect of the fibre bridging on the fracture toughness. The Benzeggagh-Kenane (B-K)criterion is capable of representing the relation between the fracture toughness and the φ-ratio. Based on the DCB and MMB test results, the predicted values of the mode II fracture toughness via the B-K criterion are very close to the experimental ones, which illustrates the possibility of determining the mode II fracture toughness without executing the mode II delamination tests. Furthermore, a semi-empirical expression is proposed, which can well predict the mixed-mode I/II delamination behaviour.

KW - Carbon fibre

KW - Composite laminates

KW - Delamination

KW - R-curve

UR - http://www.scopus.com/inward/record.url?scp=85065168614&partnerID=8YFLogxK

U2 - 10.1016/j.compstruct.2019.110949

DO - 10.1016/j.compstruct.2019.110949

M3 - Article

VL - 223

JO - Composite Structures

T2 - Composite Structures

JF - Composite Structures

SN - 0263-8223

M1 - 110949

ER -