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Cohesive element formulation for z-pin delamination bridging in fibre reinforced laminates

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Cohesive element formulation for z-pin delamination bridging in fibre reinforced laminates. / Mohamed, Galal; Allegri, Giuliano; Yasaee, Mehdi; Hallett, Stephen R.

In: International Journal of Solids and Structures, Vol. 132-133, 02.2018, p. 232-244.

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Mohamed, Galal ; Allegri, Giuliano ; Yasaee, Mehdi ; Hallett, Stephen R. / Cohesive element formulation for z-pin delamination bridging in fibre reinforced laminates. In: International Journal of Solids and Structures. 2018 ; Vol. 132-133. pp. 232-244.

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@article{c57e40b4e8444ae9b8869f46bb97a76a,
title = "Cohesive element formulation for z-pin delamination bridging in fibre reinforced laminates",
abstract = "Z-pins are an effective method of reinforcing laminated composite materials for resisting the propagation of delamination. In this paper, a novel numerical method combines the classical cohesive finite element (FE) method with a semi-analytical z-pin crack bridging model. Special purpose cohesive elements, in which the generalized traction-displacement characteristics are provided by the semi-analytical model z-pin bridging map, are implemented in macro-scale FE models. This cohesive element offers the flexibility to employ two cohesive laws concurrently for prediction of delamination propagation, for both the pinned and unpinned behaviour. Its efficacy is evaluated by the simulation of double cantilever beam (DCB), mixed-mode bend (MMB), and pure mode II End-Loaded Split (ELS) fracture tests at 2{\%} z-pin areal density. The numerical results in terms of load-deflection predictions agree well with experiments. The different simulations were all performed using a single set of input parameters derived from single z-pin tests with no fitting factors.",
keywords = "Composite materials, Fibre reinforced, Delamination, Toughness",
author = "Galal Mohamed and Giuliano Allegri and Mehdi Yasaee and Hallett, {Stephen R.}",
year = "2018",
month = "2",
doi = "10.1016/j.ijsolstr.2017.05.037",
language = "English",
volume = "132-133",
pages = "232--244",
journal = "International Journal of Solids and Structures",
issn = "0020-7683",
publisher = "Pergamon Press",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Cohesive element formulation for z-pin delamination bridging in fibre reinforced laminates

AU - Mohamed, Galal

AU - Allegri, Giuliano

AU - Yasaee, Mehdi

AU - Hallett, Stephen R.

PY - 2018/2

Y1 - 2018/2

N2 - Z-pins are an effective method of reinforcing laminated composite materials for resisting the propagation of delamination. In this paper, a novel numerical method combines the classical cohesive finite element (FE) method with a semi-analytical z-pin crack bridging model. Special purpose cohesive elements, in which the generalized traction-displacement characteristics are provided by the semi-analytical model z-pin bridging map, are implemented in macro-scale FE models. This cohesive element offers the flexibility to employ two cohesive laws concurrently for prediction of delamination propagation, for both the pinned and unpinned behaviour. Its efficacy is evaluated by the simulation of double cantilever beam (DCB), mixed-mode bend (MMB), and pure mode II End-Loaded Split (ELS) fracture tests at 2% z-pin areal density. The numerical results in terms of load-deflection predictions agree well with experiments. The different simulations were all performed using a single set of input parameters derived from single z-pin tests with no fitting factors.

AB - Z-pins are an effective method of reinforcing laminated composite materials for resisting the propagation of delamination. In this paper, a novel numerical method combines the classical cohesive finite element (FE) method with a semi-analytical z-pin crack bridging model. Special purpose cohesive elements, in which the generalized traction-displacement characteristics are provided by the semi-analytical model z-pin bridging map, are implemented in macro-scale FE models. This cohesive element offers the flexibility to employ two cohesive laws concurrently for prediction of delamination propagation, for both the pinned and unpinned behaviour. Its efficacy is evaluated by the simulation of double cantilever beam (DCB), mixed-mode bend (MMB), and pure mode II End-Loaded Split (ELS) fracture tests at 2% z-pin areal density. The numerical results in terms of load-deflection predictions agree well with experiments. The different simulations were all performed using a single set of input parameters derived from single z-pin tests with no fitting factors.

KW - Composite materials

KW - Fibre reinforced

KW - Delamination

KW - Toughness

U2 - 10.1016/j.ijsolstr.2017.05.037

DO - 10.1016/j.ijsolstr.2017.05.037

M3 - Article

VL - 132-133

SP - 232

EP - 244

JO - International Journal of Solids and Structures

T2 - International Journal of Solids and Structures

JF - International Journal of Solids and Structures

SN - 0020-7683

ER -