Shear response of 3D non-woven carbon fibre reinforced composites

Lucas R. Meza, Jim M.J. Schormans, Joris J.C. Remmers, Vikram S. Deshpande (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We experimentally and numerically investigated the shear response of a three-dimensional (3D) non-woven carbon fibre reinforced epoxy composite with three sets of orthogonal tows and approximately equal fibre volume fractions in the orthogonal directions. Shear tests on two orientations of dogbone specimens showed significant strain hardening and an increasing unloading stiffnesses with increasing applied strain. Unloading was also accompanied by considerable strain recovery, with X-ray tomographic scans revealing minimal damage accumulation in specimens until near final failure at shear strains in excess of 50%. To understand the origins of this unusual mechanical response of the 3D carbon fibre composites, we developed a micro-mechanical model wherein all tows and matrix pockets in the composite are explicitly considered. The tows were modelled using a pressure-dependent crystal plasticity approach to capture texture evolution under large deformations and the model replicated many of the experimental observations with a high degree of fidelity. Importantly, the model illustrated the role of the 3D architecture in not only suppressing delamination but also enhancing the strain hardening response due to a 3D confinement effect of the tow architecture. On the other hand, a model wherein the tows were modelled using an anisotropic Hill plasticity framework (absent plastic spin) failed to replicate the observed strain hardening response or capture the associated strain recovery upon unloading. This highlights the importance of accounting for the evolution of the material substructure within the tows of these high ductility 3D composites. The results of this work illustrate the unique mechanical behaviour of 3D non-woven fibre composites and provide insight into how 3D fibre architecture can be used to enhance the mechanical performance of fibre composites.

LanguageEnglish
Pages276-297
Number of pages22
JournalJournal of the Mechanics and Physics of Solids
Volume125
DOIs
StatePublished - 1 Apr 2019

Fingerprint

carbon fibers
Carbon fibers
strain hardening
fiber composites
unloading
shear
composite materials
Composite materials
Unloading
Strain hardening
plastic properties
Fibers
recovery
fiber volume fraction
Plasticity
shear strain
substructures
ductility
Recovery
stiffness

Keywords

  • 3D CFRP composites
  • Crystal plasticity
  • Plastic incompatibility
  • Shear hardening
  • Texture evolution

Cite this

Meza, Lucas R. ; Schormans, Jim M.J. ; Remmers, Joris J.C. ; Deshpande, Vikram S./ Shear response of 3D non-woven carbon fibre reinforced composites. In: Journal of the Mechanics and Physics of Solids. 2019 ; Vol. 125. pp. 276-297
@article{8753579f22d6448ab4e495e33fdce037,
title = "Shear response of 3D non-woven carbon fibre reinforced composites",
abstract = "We experimentally and numerically investigated the shear response of a three-dimensional (3D) non-woven carbon fibre reinforced epoxy composite with three sets of orthogonal tows and approximately equal fibre volume fractions in the orthogonal directions. Shear tests on two orientations of dogbone specimens showed significant strain hardening and an increasing unloading stiffnesses with increasing applied strain. Unloading was also accompanied by considerable strain recovery, with X-ray tomographic scans revealing minimal damage accumulation in specimens until near final failure at shear strains in excess of 50{\%}. To understand the origins of this unusual mechanical response of the 3D carbon fibre composites, we developed a micro-mechanical model wherein all tows and matrix pockets in the composite are explicitly considered. The tows were modelled using a pressure-dependent crystal plasticity approach to capture texture evolution under large deformations and the model replicated many of the experimental observations with a high degree of fidelity. Importantly, the model illustrated the role of the 3D architecture in not only suppressing delamination but also enhancing the strain hardening response due to a 3D confinement effect of the tow architecture. On the other hand, a model wherein the tows were modelled using an anisotropic Hill plasticity framework (absent plastic spin) failed to replicate the observed strain hardening response or capture the associated strain recovery upon unloading. This highlights the importance of accounting for the evolution of the material substructure within the tows of these high ductility 3D composites. The results of this work illustrate the unique mechanical behaviour of 3D non-woven fibre composites and provide insight into how 3D fibre architecture can be used to enhance the mechanical performance of fibre composites.",
keywords = "3D CFRP composites, Crystal plasticity, Plastic incompatibility, Shear hardening, Texture evolution",
author = "Meza, {Lucas R.} and Schormans, {Jim M.J.} and Remmers, {Joris J.C.} and Deshpande, {Vikram S.}",
year = "2019",
month = "4",
day = "1",
doi = "10.1016/j.jmps.2018.12.019",
language = "English",
volume = "125",
pages = "276--297",
journal = "Journal of the Mechanics and Physics of Solids",
issn = "0022-5096",
publisher = "Elsevier",

}

Shear response of 3D non-woven carbon fibre reinforced composites. / Meza, Lucas R.; Schormans, Jim M.J.; Remmers, Joris J.C.; Deshpande, Vikram S. (Corresponding author).

In: Journal of the Mechanics and Physics of Solids, Vol. 125, 01.04.2019, p. 276-297.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Shear response of 3D non-woven carbon fibre reinforced composites

AU - Meza,Lucas R.

AU - Schormans,Jim M.J.

AU - Remmers,Joris J.C.

AU - Deshpande,Vikram S.

PY - 2019/4/1

Y1 - 2019/4/1

N2 - We experimentally and numerically investigated the shear response of a three-dimensional (3D) non-woven carbon fibre reinforced epoxy composite with three sets of orthogonal tows and approximately equal fibre volume fractions in the orthogonal directions. Shear tests on two orientations of dogbone specimens showed significant strain hardening and an increasing unloading stiffnesses with increasing applied strain. Unloading was also accompanied by considerable strain recovery, with X-ray tomographic scans revealing minimal damage accumulation in specimens until near final failure at shear strains in excess of 50%. To understand the origins of this unusual mechanical response of the 3D carbon fibre composites, we developed a micro-mechanical model wherein all tows and matrix pockets in the composite are explicitly considered. The tows were modelled using a pressure-dependent crystal plasticity approach to capture texture evolution under large deformations and the model replicated many of the experimental observations with a high degree of fidelity. Importantly, the model illustrated the role of the 3D architecture in not only suppressing delamination but also enhancing the strain hardening response due to a 3D confinement effect of the tow architecture. On the other hand, a model wherein the tows were modelled using an anisotropic Hill plasticity framework (absent plastic spin) failed to replicate the observed strain hardening response or capture the associated strain recovery upon unloading. This highlights the importance of accounting for the evolution of the material substructure within the tows of these high ductility 3D composites. The results of this work illustrate the unique mechanical behaviour of 3D non-woven fibre composites and provide insight into how 3D fibre architecture can be used to enhance the mechanical performance of fibre composites.

AB - We experimentally and numerically investigated the shear response of a three-dimensional (3D) non-woven carbon fibre reinforced epoxy composite with three sets of orthogonal tows and approximately equal fibre volume fractions in the orthogonal directions. Shear tests on two orientations of dogbone specimens showed significant strain hardening and an increasing unloading stiffnesses with increasing applied strain. Unloading was also accompanied by considerable strain recovery, with X-ray tomographic scans revealing minimal damage accumulation in specimens until near final failure at shear strains in excess of 50%. To understand the origins of this unusual mechanical response of the 3D carbon fibre composites, we developed a micro-mechanical model wherein all tows and matrix pockets in the composite are explicitly considered. The tows were modelled using a pressure-dependent crystal plasticity approach to capture texture evolution under large deformations and the model replicated many of the experimental observations with a high degree of fidelity. Importantly, the model illustrated the role of the 3D architecture in not only suppressing delamination but also enhancing the strain hardening response due to a 3D confinement effect of the tow architecture. On the other hand, a model wherein the tows were modelled using an anisotropic Hill plasticity framework (absent plastic spin) failed to replicate the observed strain hardening response or capture the associated strain recovery upon unloading. This highlights the importance of accounting for the evolution of the material substructure within the tows of these high ductility 3D composites. The results of this work illustrate the unique mechanical behaviour of 3D non-woven fibre composites and provide insight into how 3D fibre architecture can be used to enhance the mechanical performance of fibre composites.

KW - 3D CFRP composites

KW - Crystal plasticity

KW - Plastic incompatibility

KW - Shear hardening

KW - Texture evolution

UR - http://www.scopus.com/inward/record.url?scp=85059351524&partnerID=8YFLogxK

U2 - 10.1016/j.jmps.2018.12.019

DO - 10.1016/j.jmps.2018.12.019

M3 - Article

VL - 125

SP - 276

EP - 297

JO - Journal of the Mechanics and Physics of Solids

T2 - Journal of the Mechanics and Physics of Solids

JF - Journal of the Mechanics and Physics of Solids

SN - 0022-5096

ER -