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Multiscale modeling of the effect of sub-ply voids on the failure of composite materials. / Turteltaub, Sergio; de Jong, Gijs.

In: International Journal of Solids and Structures, Vol. 165, 15.06.2019, p. 63-74.

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Turteltaub, Sergio ; de Jong, Gijs. / Multiscale modeling of the effect of sub-ply voids on the failure of composite materials. In: International Journal of Solids and Structures. 2019 ; Vol. 165. pp. 63-74.

BibTeX

@article{0c1da71b2c054949839d809337f7e376,
title = "Multiscale modeling of the effect of sub-ply voids on the failure of composite materials",
abstract = "A multiscale fracture model is developed to study the influence of defects appearing at a microscale in a fiber-reinforced composite laminate. The model establishes a link between the geometrical characteristics of sub-ply imperfections that may be created during manufacturing and the overall fracture strength and fracture energy of the composite. In particular, a recently-developed multiscale theory is expanded to account for microvoids inside the matrix and gaps between closely-spaced fibers that prevent filling. These defects are explicitly incorporated in finite element simulations to study their influence on the onset and propagation of cracks at the sub-ply level. To connect these microcracks to the effective fracture behavior at a ply-level, a computational homogenization technique is applied to extract the energetically-equivalent macroscopic fracture properties. Through a parametric analysis of configurations, the influence of the void content (porosity), void type and void shape on the effective fracture strength and the effective fracture energy of a composite are quantified. Results show that the porosity is the main parameter influencing fracture properties while the shape of the defects and their type (matrix or interfiber) only play a secondary role. Furthermore, the influence of voids on the fracture properties appears to be strongly dependent on the loading conditions. In particular, for the range of porosity analyzed (up to 8{\%}), the influence of voids in mode I on the transverse fracture strength is not significant but the transverse fracture energy decreases approximately linearly down to about 50{\%} of its original value. In contrast, in mode II, the transverse fracture strength is significantly affected with increasing porosity. Furthermore, the transverse fracture energy depends nonlinearly on the porosity and the reduction is relatively more pronounced than for mode I.",
keywords = "Cohesive elements, Composite materials, Multiscale fracture, Representative surface element, Voids",
author = "Sergio Turteltaub and {de Jong}, Gijs",
note = "Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.",
year = "2019",
month = "6",
day = "15",
doi = "10.1016/j.ijsolstr.2019.01.031",
language = "English",
volume = "165",
pages = "63--74",
journal = "International Journal of Solids and Structures",
issn = "0020-7683",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Multiscale modeling of the effect of sub-ply voids on the failure of composite materials

AU - Turteltaub, Sergio

AU - de Jong, Gijs

N1 - Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

PY - 2019/6/15

Y1 - 2019/6/15

N2 - A multiscale fracture model is developed to study the influence of defects appearing at a microscale in a fiber-reinforced composite laminate. The model establishes a link between the geometrical characteristics of sub-ply imperfections that may be created during manufacturing and the overall fracture strength and fracture energy of the composite. In particular, a recently-developed multiscale theory is expanded to account for microvoids inside the matrix and gaps between closely-spaced fibers that prevent filling. These defects are explicitly incorporated in finite element simulations to study their influence on the onset and propagation of cracks at the sub-ply level. To connect these microcracks to the effective fracture behavior at a ply-level, a computational homogenization technique is applied to extract the energetically-equivalent macroscopic fracture properties. Through a parametric analysis of configurations, the influence of the void content (porosity), void type and void shape on the effective fracture strength and the effective fracture energy of a composite are quantified. Results show that the porosity is the main parameter influencing fracture properties while the shape of the defects and their type (matrix or interfiber) only play a secondary role. Furthermore, the influence of voids on the fracture properties appears to be strongly dependent on the loading conditions. In particular, for the range of porosity analyzed (up to 8%), the influence of voids in mode I on the transverse fracture strength is not significant but the transverse fracture energy decreases approximately linearly down to about 50% of its original value. In contrast, in mode II, the transverse fracture strength is significantly affected with increasing porosity. Furthermore, the transverse fracture energy depends nonlinearly on the porosity and the reduction is relatively more pronounced than for mode I.

AB - A multiscale fracture model is developed to study the influence of defects appearing at a microscale in a fiber-reinforced composite laminate. The model establishes a link between the geometrical characteristics of sub-ply imperfections that may be created during manufacturing and the overall fracture strength and fracture energy of the composite. In particular, a recently-developed multiscale theory is expanded to account for microvoids inside the matrix and gaps between closely-spaced fibers that prevent filling. These defects are explicitly incorporated in finite element simulations to study their influence on the onset and propagation of cracks at the sub-ply level. To connect these microcracks to the effective fracture behavior at a ply-level, a computational homogenization technique is applied to extract the energetically-equivalent macroscopic fracture properties. Through a parametric analysis of configurations, the influence of the void content (porosity), void type and void shape on the effective fracture strength and the effective fracture energy of a composite are quantified. Results show that the porosity is the main parameter influencing fracture properties while the shape of the defects and their type (matrix or interfiber) only play a secondary role. Furthermore, the influence of voids on the fracture properties appears to be strongly dependent on the loading conditions. In particular, for the range of porosity analyzed (up to 8%), the influence of voids in mode I on the transverse fracture strength is not significant but the transverse fracture energy decreases approximately linearly down to about 50% of its original value. In contrast, in mode II, the transverse fracture strength is significantly affected with increasing porosity. Furthermore, the transverse fracture energy depends nonlinearly on the porosity and the reduction is relatively more pronounced than for mode I.

KW - Cohesive elements

KW - Composite materials

KW - Multiscale fracture

KW - Representative surface element

KW - Voids

UR - http://www.scopus.com/inward/record.url?scp=85060999809&partnerID=8YFLogxK

U2 - 10.1016/j.ijsolstr.2019.01.031

DO - 10.1016/j.ijsolstr.2019.01.031

M3 - Article

VL - 165

SP - 63

EP - 74

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 -

ID: 51649507