42 lines
2.3 KiB
Markdown
42 lines
2.3 KiB
Markdown
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#description
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# optimization of carbon-epoxy plates with a viscoelastic layer
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*2020* #perforated #vem
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[online ref](https://www.tandfonline.com/doi/abs/10.1080/15376494.2021.1882626)
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[[Article_Taylor_and_Francis_vfinal.pdf|local ref]]
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**basis of the work**
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*both experimental and numerical analyse*
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This papers explore the use of [[PCLD]], its goal is to optimise the damping (of the dynamic response) from the [[Viscoelasticity|viscoelastic]] 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.
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The bridges are made by puncturing the viscoelastic layer with holes so that some of the epoxy matrix fills them.
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The simulations where made using the [[Finite element method]], with 2D elements for the carbon-epoxy layers and 3D elements with a [[Hyperelastic model|neo-hookean visco-hyper-elastic behavior law]] for the inserted layer. The simulations are accurate with the experiments.
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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.
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# thesis
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*2020* #perforated #vem
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[[manuscrit_de_these_de_Remy_Mateu_Pastor.pdf|local ref]]
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Viscoelastic layer :
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hyperelastic (see [[manuscrit_de_these_de_Remy_Mateu_Pastor.pdf#page=27|ref]]) when static
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viscoelastic (see [[manuscrit_de_these_de_Remy_Mateu_Pastor.pdf#page=29|ref]]) when dynamic
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It is possible to tweak the hyperelastic parameters with the frequency and conjugate it to a viscoelastic model.
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---
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## Improving carbon-epoxy toughness via interleaved porous PES
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*2019* #perforated
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[online ref](https://www.sciencedirect.com/science/article/abs/pii/S0266353819313806)
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[[Improving_carbon-epoxy_toughness_via_interleaved_porous_PES.pdf|local ref]]
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This papers aims to assess the improvements of adding perforated polyethersulfone (PES) films (**viscoelastic ?**) to the interlaminar fracture of carbon-epoxy laminates.
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An increase of the fracture energy for [[Fracture Toughness#Fracture modes|mode I and II]] 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.
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Common interleaves : microfiber veils, continuous films and electrospun nanofiber mats.
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