Article (Scientific journals)
Evaluation of microdamage initiation in Z-pinned laminates by means of automated RVE computations
Pierreux, Gerrit; Wu, Ling; Van Hemelrijck, Danny et al.
2018In Composite Structures, 206, p. 104-115
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NOTICE: this is the author’s version of a work that was accepted for publication in Composite Structures. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Composite Structures 206 (2018), 104-115, doi: 10.1016/j.compstruct.2018.07.122


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Keywords :
Z-pinning; internal geometry; mechanical properties; multiscale modelling
Abstract :
[en] Z-pinning was originally designed to improve the delamination toughness and the impact resistance of composite laminates. However, there is extensive experimental evidence that this improvement is accompanied by a reduction of the in-plane properties. The main mechanisms responsible for this deterioration are the local change in fiber content, fiber distortion, and the inclusion of resin-rich regions near the Z-pin. The shape of these geometrical features strongly depends on the laminate stacking sequence and on pin parameters such as pin diameter, pin content, and initial pin inclination angle. Their shape complexity challenges analytical modelling approaches which are currently used to generate RVE geometries for simulations. A computational approach is presented to generate such geometrical models. Resin-rich regions are modelled by initially straight discretized lines which are gradually shaped by a set of geometrical operations mimicking pin insertion, pin rotation and fiber deflection. Fiber distortion is modelled in a post-processing stage in cross-sections accounting for the preservation of the amount of fibers. These models are then transformed into finite element mechanical models in order to investigate how local fiber volume fraction changes, fiber misalignment, or distortions in reinforcement due to pin rotation, affect the global stiffness and local stress concentrations.
Disciplines :
Mechanical engineering
Aerospace & aeronautics engineering
Materials science & engineering
Author, co-author :
Pierreux, Gerrit;  Université Libre de Bruxelles - ULB
Wu, Ling ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Computational & Multiscale Mechanics of Materials (CM3)
Van Hemelrijck, Danny;  Vrije Universiteit Brussel - VUB
Massart, Thierry J;  Université Libre de Bruxelles - ULB
Language :
English
Title :
Evaluation of microdamage initiation in Z-pinned laminates by means of automated RVE computations
Publication date :
15 December 2018
Journal title :
Composite Structures
ISSN :
0263-8223
eISSN :
1879-1085
Publisher :
Elsevier, Netherlands
Volume :
206
Pages :
104-115
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
IWT - Agentschap voor Innovatie door Wetenschap en Technologie [BE]
Funding text :
The first author acknowledges the support of IWT under Grant No. IWT- SB-678.
Available on ORBi :
since 02 August 2018

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