On mode-I and mode-II interlaminar crack migration and R-curves in carbon/epoxy laminates with hybrid toughening via core-shell rubber particles and thermoplastic micro-fibre veilsCitation formats

  • External authors:
  • Mehmet Çağatay Akbolat
  • Stephan Sprenger
  • James Taylor

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On mode-I and mode-II interlaminar crack migration and R-curves in carbon/epoxy laminates with hybrid toughening via core-shell rubber particles and thermoplastic micro-fibre veils. / Akbolat, Mehmet Çağatay; Katnam, Kali Babu; Soutis, Constantinos et al.

In: Composites Part B: Engineering, Vol. 238, 109900, 01.06.2022.

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@article{3599a0d476e24186ae0a021ab8d816b4,
title = "On mode-I and mode-II interlaminar crack migration and R-curves in carbon/epoxy laminates with hybrid toughening via core-shell rubber particles and thermoplastic micro-fibre veils",
abstract = "This study investigates the influence of hybrid toughening—via core-shell rubber (CSR) particles and non-woven thermoplastic veils—on the delamination resistance, crack migration and R-curve behaviour in carbon fibre/epoxy laminates under mode-I and mode-II conditions. Core-shell rubber particles, varying in size from 100 nm to 3 μm, with 0–10 wt% content, are dispersed within the epoxy resin, and thermoplastic micro-fibre veils with polyphenylene sulfide (PPS) fibres, with 5–20 g/m 2 areal weight, are introduced at the interlaminar region to achieve hybrid toughening. Carbon fibre/epoxy laminates are manufactured with a two-part resin using vacuum infusion and out-of-autoclave curing. Double cantilever beam (DCB) and four-point end-notch-flexure (4ENF) specimens are used to obtain mode-I and mode-II fracture energies and R-curves. Damage mechanisms and crack paths are characterised using fractography that provide understanding of energy dissipation. The results show that the hybrid toughening significantly improves fracture initiation and propagation energies (i.e. mode I initiation by ∼245% and propagation by ∼275%, and mode-II initiation by ∼64% and propagation ∼215%) by extrinsic and intrinsic toughening mechanisms. Moreover, it is shown that rising R-curves can be achieved with hybrid toughening when compared with falling R-curves obtained with just thermoplastic veil toughening. Fractography revealed that the hybrid toughening constrained the crack predominantly within the veil region, making it harder to grow and absorb more energy. ",
keywords = "A. Nano-structures, B. Debonding, B. Fracture toughness, D. Fractography, Toughening mechanisms",
author = "Akbolat, {Mehmet {\c C}ağatay} and Katnam, {Kali Babu} and Constantinos Soutis and Prasad Potluri and Stephan Sprenger and James Taylor",
note = "Funding Information: The authors would like to acknowledge the Ministry of National Education of the Republic of Turkey for the doctoral scholarship offered to Mehmet ?a?atay Akbolat, and also Evonik (Germany) and Technical Fibre Products (UK) for supplying materials. Publisher Copyright: {\textcopyright} 2022 The Authors",
year = "2022",
month = jun,
day = "1",
doi = "10.1016/j.compositesb.2022.109900",
language = "English",
volume = "238",
journal = "Composites. Part B: Engineering",
issn = "1359-8368",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - On mode-I and mode-II interlaminar crack migration and R-curves in carbon/epoxy laminates with hybrid toughening via core-shell rubber particles and thermoplastic micro-fibre veils

AU - Akbolat, Mehmet Çağatay

AU - Katnam, Kali Babu

AU - Soutis, Constantinos

AU - Potluri, Prasad

AU - Sprenger, Stephan

AU - Taylor, James

N1 - Funding Information: The authors would like to acknowledge the Ministry of National Education of the Republic of Turkey for the doctoral scholarship offered to Mehmet ?a?atay Akbolat, and also Evonik (Germany) and Technical Fibre Products (UK) for supplying materials. Publisher Copyright: © 2022 The Authors

PY - 2022/6/1

Y1 - 2022/6/1

N2 - This study investigates the influence of hybrid toughening—via core-shell rubber (CSR) particles and non-woven thermoplastic veils—on the delamination resistance, crack migration and R-curve behaviour in carbon fibre/epoxy laminates under mode-I and mode-II conditions. Core-shell rubber particles, varying in size from 100 nm to 3 μm, with 0–10 wt% content, are dispersed within the epoxy resin, and thermoplastic micro-fibre veils with polyphenylene sulfide (PPS) fibres, with 5–20 g/m 2 areal weight, are introduced at the interlaminar region to achieve hybrid toughening. Carbon fibre/epoxy laminates are manufactured with a two-part resin using vacuum infusion and out-of-autoclave curing. Double cantilever beam (DCB) and four-point end-notch-flexure (4ENF) specimens are used to obtain mode-I and mode-II fracture energies and R-curves. Damage mechanisms and crack paths are characterised using fractography that provide understanding of energy dissipation. The results show that the hybrid toughening significantly improves fracture initiation and propagation energies (i.e. mode I initiation by ∼245% and propagation by ∼275%, and mode-II initiation by ∼64% and propagation ∼215%) by extrinsic and intrinsic toughening mechanisms. Moreover, it is shown that rising R-curves can be achieved with hybrid toughening when compared with falling R-curves obtained with just thermoplastic veil toughening. Fractography revealed that the hybrid toughening constrained the crack predominantly within the veil region, making it harder to grow and absorb more energy.

AB - This study investigates the influence of hybrid toughening—via core-shell rubber (CSR) particles and non-woven thermoplastic veils—on the delamination resistance, crack migration and R-curve behaviour in carbon fibre/epoxy laminates under mode-I and mode-II conditions. Core-shell rubber particles, varying in size from 100 nm to 3 μm, with 0–10 wt% content, are dispersed within the epoxy resin, and thermoplastic micro-fibre veils with polyphenylene sulfide (PPS) fibres, with 5–20 g/m 2 areal weight, are introduced at the interlaminar region to achieve hybrid toughening. Carbon fibre/epoxy laminates are manufactured with a two-part resin using vacuum infusion and out-of-autoclave curing. Double cantilever beam (DCB) and four-point end-notch-flexure (4ENF) specimens are used to obtain mode-I and mode-II fracture energies and R-curves. Damage mechanisms and crack paths are characterised using fractography that provide understanding of energy dissipation. The results show that the hybrid toughening significantly improves fracture initiation and propagation energies (i.e. mode I initiation by ∼245% and propagation by ∼275%, and mode-II initiation by ∼64% and propagation ∼215%) by extrinsic and intrinsic toughening mechanisms. Moreover, it is shown that rising R-curves can be achieved with hybrid toughening when compared with falling R-curves obtained with just thermoplastic veil toughening. Fractography revealed that the hybrid toughening constrained the crack predominantly within the veil region, making it harder to grow and absorb more energy.

KW - A. Nano-structures

KW - B. Debonding

KW - B. Fracture toughness

KW - D. Fractography

KW - Toughening mechanisms

UR - https://doi.org/10.1016/j.compositesb.2022.109900

U2 - 10.1016/j.compositesb.2022.109900

DO - 10.1016/j.compositesb.2022.109900

M3 - Article

VL - 238

JO - Composites. Part B: Engineering

JF - Composites. Part B: Engineering

SN - 1359-8368

M1 - 109900

ER -