Design, manufacturing and testing of 3D printed variable-stiffness laminates for improved open-hole tensile behaviour [* Cross-Reference *]

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M. Iragi; Cristina Pascual-González; A. Esnaola; U. Morales; J. Aurrekoetxea; C.S. Lopes; L. Aretxabaleta, 2023, "Design, manufacturing and testing of 3D printed variable-stiffness laminates for improved open-hole tensile behaviour [* Cross-Reference *]", https://lore.list.lu/citation?persistentId=perma:LIST.MM8E1F, LIST Open Repository, V1
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Description
Using 3D printing, continuous fibre can be steered in high curvature paths to create variable-stiffness (VS) laminates for applications such as notched laminates. In the present study, VS 3D printed continuous carbon fibre-reinforced thermoplastic laminates were designed, manufactured, and tested, to improve open-hole tensile behaviour. The design was carried out taking into account the current limitations of fused filament fabrication. A curvilinear function was used to describe the fibre trajectory of the VS laminates, which enabled the parametrisation of the design-oriented meso-scale model based on the finite element method. Conventional stress-based models for the estimation of damage initiation and ultimate failure strengths were adapted to the behaviour of the 3D printed material. These models successfully reproduced the fibre-dominated behaviour of the printed laminate. An as-manufactured model was also developed to analyse the effect of defects caused by manufacturing constraints. VS laminates presented higher strength than quasi-isotropic reference laminates for holes larger than ∅1mm, increasing to more than 30% for holes of ∅6mm or larger. In addition, this increase in strength combined with the slight decrease in stiffness significantly increased the energy absorbed up to failure (up to 200%). (2023-01-18)
***This entry has been automatically imported via OpenAlex by LIST harvest scripts. Please refer to https://doi.org/10.1016/j.addma.2023.103418 for the original and latest version of the publication*** (2026-07-01)
Subject Engineering; Physics
Keyword Materials science, Composite material, Ultimate tensile strength, Composite laminates, Stiffness, Fused filament fabrication, Curvature, Finite element method, Curvilinear coordinates, Fabrication, Isotropy, Structural engineering, 3D printing, Composite number
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