Effective shear modulus of a damaged ply in laminate stiffness analysis
Determination and validation
Document identifier: oai:DiVA.org:ltu-76324
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10.1177/0021998319874369Keyword: Engineering and Technology,
Materials Engineering,
Composite Science and Engineering,
Teknik och teknologier,
Materialteknik,
Kompositmaterial och -teknik,
Effective shear modulus,
Effective stiffness,
Stiffness prediction,
Transverse cracking,
Polymeric Composite Materials,
Polymera kompositmaterialPublication year: 2020Relevant Sustainable Development Goals (SDGs):
The SDG label(s) above have been assigned by OSDG.aiAbstract: The concept of the “effective stiffness” for plies in laminates containing intralaminar cracks is revisited presenting rather accurate fitting expressions for the effective stiffness dependence on crack density in the ply. In this article, the effective stiffness at certain crack density is back-calculated from the stiffness difference between the undamaged and damaged laminate. Earlier finite element method analysis of laminates with cracked 90-plies showed that the effective longitudinal modulus and Poisson’s ratio of the ply do not change during cracking, whereas the transverse modulus reduction can be described by a simple crack density dependent function. In this article, focus is on the remaining effective constant: in-plane shear modulus. Finite element method parametric analysis shows that the dependence on crack density is exponential and the fitting function is almost independent of geometrical and elastic parameters of the surrounding plies. The above independence justifies using the effective ply stiffness in expressions of the classical laminate theory to predict the intralaminar cracking caused stiffness reduction in laminates with off-axis plies. Results are in a very good agreement with (a) finite element method calculations; (b) experimental data, and (c) with the GLOB-LOC model, which gives a very accurate solution in cases where the crack face opening and sliding displacements are accurately described.
Authors
Mohamed Sahbi Loukil
RISE SICOMP, Sweden. Department of Management and Engineering, Linköping University, Sweden
Other publications
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Janis Varna
Luleå tekniska universitet; Materialvetenskap
Other publications
>>
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identifier: oai:DiVA.org:ltu-76324
datestamp: 2021-04-19T12:41:37Z
setSpec: SwePub-ltu
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recordCreationDate: 2019-10-09
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http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76324
10.1177/0021998319874369
2-s2.0-85074012497
titleInfo:
@attributes:
lang: eng
title: Effective shear modulus of a damaged ply in laminate stiffness analysis
subTitle: Determination and validation
abstract: The concept of the “effective stiffness” for plies in laminates containing intralaminar cracks is revisited presenting rather accurate fitting expressions for the effective stiffness dependence on crack density in the ply. In this article the effective stiffness at certain crack density is back-calculated from the stiffness difference between the undamaged and damaged laminate. Earlier finite element method analysis of laminates with cracked 90-plies showed that the effective longitudinal modulus and Poisson’s ratio of the ply do not change during cracking whereas the transverse modulus reduction can be described by a simple crack density dependent function. In this article focus is on the remaining effective constant: in-plane shear modulus. Finite element method parametric analysis shows that the dependence on crack density is exponential and the fitting function is almost independent of geometrical and elastic parameters of the surrounding plies. The above independence justifies using the effective ply stiffness in expressions of the classical laminate theory to predict the intralaminar cracking caused stiffness reduction in laminates with off-axis plies. Results are in a very good agreement with (a) finite element method calculations; (b) experimental data and (c) with the GLOB-LOC model which gives a very accurate solution in cases where the crack face opening and sliding displacements are accurately described.
subject:
@attributes:
lang: eng
authority: uka.se
topic:
Engineering and Technology
Materials Engineering
Composite Science and Engineering
@attributes:
lang: swe
authority: uka.se
topic:
Teknik och teknologier
Materialteknik
Kompositmaterial och -teknik
@attributes:
lang: eng
topic: Effective shear modulus
@attributes:
lang: eng
topic: effective stiffness
@attributes:
lang: eng
topic: stiffness prediction
@attributes:
lang: eng
topic: transverse cracking
@attributes:
lang: eng
authority: ltu
topic: Polymeric Composite Materials
genre: Research subject
@attributes:
lang: swe
authority: ltu
topic: Polymera kompositmaterial
genre: Research subject
language:
languageTerm: eng
genre:
publication/journal-article
ref
note:
Published
2
Validerad;2020;Nivå 2;2020-03-24 (alebob)
name:
@attributes:
type: personal
namePart:
Loukil
Mohamed Sahbi
role:
roleTerm: aut
affiliation: RISE SICOMP Sweden. Department of Management and Engineering Linköping University Sweden
@attributes:
type: personal
authority: ltu
namePart:
Varna
Janis
role:
roleTerm: aut
affiliation:
Luleå tekniska universitet
Materialvetenskap
nameIdentifier:
janis
0000-0001-9649-8621
originInfo:
dateIssued: 2020
publisher: Sage Publications
relatedItem:
@attributes:
type: host
titleInfo:
title: Journal of composite materials
identifier:
0021-9983
1530-793X
part:
detail:
@attributes:
type: volume
number: 54
@attributes:
type: issue
number: 9
extent:
start: 1161
end: 1176
physicalDescription:
form: print
typeOfResource: text