Numerical and Experimental Analysis of the Frictional Effects on 4ENF Delamination Tests Performed on Unidirectional CFRP

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Abstract

Progressive delamination in composite materials under static or fatigue loading condition are, in many structures, one of the predominant cause of failure. In the paper, an accurate study of quasi-static delamination growth under mode II loading condition is conducted. Several experimental tests are performed on composite laminates consisting of unidirectional carbon/epoxy layers. Four-point end-notched flexure (4ENF) test is employed in order to characterize the mode II interlaminar fracture toughness. The R-curve is obtained by means of optical and numerical determination of crack tip position. The energy release rate and the crack length are calculated through experimental determination of the compliance until unstable advance occurs. In order to confirm the experimental results, a cohesive-frictional model, implemented in the finite element program FEAP, allows to evaluate the influence of frictional phenomena in the Mode II delamination, when the compression of the two interfaces increases the energy dissipation due to the friction.
Lingua originaleEnglish
pagine (da-a)372-380
Numero di pagine9
RivistaProcedia Engineering
Volume109
Stato di pubblicazionePublished - 2015

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Carbon fiber reinforced plastics
Delamination
Energy release rate
Composite materials
Crack tips
Laminates
Fracture toughness
Energy dissipation
Fatigue of materials
Friction
Cracks
Carbon

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cita questo

@article{92d712648ac648108846933cfee8a08d,
title = "Numerical and Experimental Analysis of the Frictional Effects on 4ENF Delamination Tests Performed on Unidirectional CFRP",
abstract = "Progressive delamination in composite materials under static or fatigue loading condition are, in many structures, one of the predominant cause of failure. In the paper, an accurate study of quasi-static delamination growth under mode II loading condition is conducted. Several experimental tests are performed on composite laminates consisting of unidirectional carbon/epoxy layers. Four-point end-notched flexure (4ENF) test is employed in order to characterize the mode II interlaminar fracture toughness. The R-curve is obtained by means of optical and numerical determination of crack tip position. The energy release rate and the crack length are calculated through experimental determination of the compliance until unstable advance occurs. In order to confirm the experimental results, a cohesive-frictional model, implemented in the finite element program FEAP, allows to evaluate the influence of frictional phenomena in the Mode II delamination, when the compression of the two interfaces increases the energy dissipation due to the friction.",
keywords = "4ENF; CFRP; Cohesive Zone Model; Composite materials; Delamination; Mode II; Engineering (all)",
author = "Antonino Pasta and Francesco Parrinello and Marannano, {Giuseppe Vincenzo}",
year = "2015",
language = "English",
volume = "109",
pages = "372--380",
journal = "Procedia Engineering",
issn = "1877-7058",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Numerical and Experimental Analysis of the Frictional Effects on 4ENF Delamination Tests Performed on Unidirectional CFRP

AU - Pasta, Antonino

AU - Parrinello, Francesco

AU - Marannano, Giuseppe Vincenzo

PY - 2015

Y1 - 2015

N2 - Progressive delamination in composite materials under static or fatigue loading condition are, in many structures, one of the predominant cause of failure. In the paper, an accurate study of quasi-static delamination growth under mode II loading condition is conducted. Several experimental tests are performed on composite laminates consisting of unidirectional carbon/epoxy layers. Four-point end-notched flexure (4ENF) test is employed in order to characterize the mode II interlaminar fracture toughness. The R-curve is obtained by means of optical and numerical determination of crack tip position. The energy release rate and the crack length are calculated through experimental determination of the compliance until unstable advance occurs. In order to confirm the experimental results, a cohesive-frictional model, implemented in the finite element program FEAP, allows to evaluate the influence of frictional phenomena in the Mode II delamination, when the compression of the two interfaces increases the energy dissipation due to the friction.

AB - Progressive delamination in composite materials under static or fatigue loading condition are, in many structures, one of the predominant cause of failure. In the paper, an accurate study of quasi-static delamination growth under mode II loading condition is conducted. Several experimental tests are performed on composite laminates consisting of unidirectional carbon/epoxy layers. Four-point end-notched flexure (4ENF) test is employed in order to characterize the mode II interlaminar fracture toughness. The R-curve is obtained by means of optical and numerical determination of crack tip position. The energy release rate and the crack length are calculated through experimental determination of the compliance until unstable advance occurs. In order to confirm the experimental results, a cohesive-frictional model, implemented in the finite element program FEAP, allows to evaluate the influence of frictional phenomena in the Mode II delamination, when the compression of the two interfaces increases the energy dissipation due to the friction.

KW - 4ENF; CFRP; Cohesive Zone Model; Composite materials; Delamination; Mode II; Engineering (all)

UR - http://hdl.handle.net/10447/167800

UR - http://www.sciencedirect.com/science/journal/18777058

M3 - Article

VL - 109

SP - 372

EP - 380

JO - Procedia Engineering

JF - Procedia Engineering

SN - 1877-7058

ER -