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#description
optimization of carbon-epoxy plates with a viscoelastic layer
2020 #perforated #vem online ref Article_Taylor_and_Francis_vfinal.pdf
basis of the work
both experimental and numerical analyse
This papers explore the use of PCLD, its goal is to optimise the damping (of the dynamic response) from the Viscoelasticity layer (DYAD) while keeping some stiffness (at least half of the undamped plate), by studying the size and placement of the bridges between the two external layers of carbon-epoxy.
The bridges are made by puncturing the viscoelastic layer with holes so that some of the epoxy matrix fills them.
The simulations where made using the Finite element method, with 2D elements for the carbon-epoxy layers and 3D elements with a Hyperelastic model for the inserted layer. The simulations are accurate with the experiments.
The paper also points out an issue with the manufacturing of the bridges : the epoxy does not fill the holes fully, so there are bubbles or gaps, diminishing the properties of the material.
thesis
2020 #perforated #vem manuscrit_de_these_de_Remy_Mateu_Pastor.pdf Viscoelastic layer : hyperelastic (see ref) when static viscoelastic (see ref) when dynamic
It is possible to tweak the hyperelastic parameters with the frequency and conjugate it to a viscoelastic model.
Improving carbon-epoxy toughness via interleaved porous PES
2019 #perforated online ref Improving_carbon-epoxy_toughness_via_interleaved_porous_PES.pdf
This papers aims to assess the improvements of adding perforated polyethersulfone (PES) films (viscoelastic ?) to the interlaminar fracture of carbon-epoxy laminates.
An increase of the fracture energy for Fracture Toughness#Fracture modes was shown. In addition to that, an increase of the interlaminar shear strength was observed, with no significant changes in the flexural and tensile properties.
Common interleaves : microfiber veils, continuous films and electrospun nanofiber mats.