Effect of hygrothermal ageing on the shear creep behaviour of eco-friendly sandwich cores

Benjamin Sala; Xavier Gabrion; Thomas Jeannin; Frédérique Trivaudey; Violaine Guicheret-Retel; Fabrizio  Scarpa; Vincent Placet

doi:10.1016/j.compositesb.2021.109572

Effect of hygrothermal ageing on the shear creep behaviour of eco-friendly sandwich cores

Benjamin Sala^*, Xavier Gabrion, Thomas Jeannin, Frédérique Trivaudey, Violaine Guicheret-Retel, Fabrizio Scarpa, Vincent Placet

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

5 Citations (Scopus)

Abstract

The development of sustainable sandwich materials is needed in the transportation sector to address environmental concerns related to the production and operation of vehicles. In addition to biobased composite skins, alternatives to classic synthetic core materials must be found to reduce the ecological footprint of whole sandwich-structured composites. This study focused on three eco-friendly lightweight core materials: balsa wood, paper honeycomb, and recycled PET foam. The effect of the hygrothermal ageing on their shear creep/recovery behaviour has been here investigated. Two different environmental conditions were tested: 23 °C-50% RH and 70 °C-65% RH. The results indicate that the maximum shear strain, the time-delayed strain and the residual strain increase for the three core materials with the severity of the hygrothermal conditions. This was attributed to the softening of the constitutive polymeric materials of the cell walls at temperatures close to 70 °C. The balsa wood exhibits the best creep resistance under the two environmental conditions. The identification of the viscoelastic properties highlights that the release times and the shear viscous parameters of the balsa wood and the PET foam depend on the stress level and the hygrothermal conditions.

Original language	English
Article number	109572
Journal	Composites Part B: Engineering
Volume	231
Early online date	14 Dec 2021
DOIs	https://doi.org/10.1016/j.compositesb.2021.109572
Publication status	Published - 15 Feb 2022

Bibliographical note

Funding Information:
The authors would like to acknowledge the funding received from the Bio Based Industries Joint Undertaking under the European Union's Horizon 2020 research and innovation program under grant agreement No 744349? SSUCHY project. The authors would also like to thank Armacell Company for providing the rPET foam. This work has also been supported by the EIPHI Graduate school (contract ?ANR-17-EURE-0002?).

Funding Information:
The authors would like to acknowledge the funding received from the Bio Based Industries Joint Undertaking under the European Union's Horizon 2020 research and innovation program under grant agreement No 744349– SSUCHY project. The authors would also like to thank Armacell Company for providing the rPET foam. This work has also been supported by the EIPHI Graduate school (contract "ANR-17-EURE-0002").

Publisher Copyright:
© 2021

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Scarpa, F. (Principal Investigator)
1/09/17 → 31/08/21
Project: Research, Parent

Cite this

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title = "Effect of hygrothermal ageing on the shear creep behaviour of eco-friendly sandwich cores",

abstract = "The development of sustainable sandwich materials is needed in the transportation sector to address environmental concerns related to the production and operation of vehicles. In addition to biobased composite skins, alternatives to classic synthetic core materials must be found to reduce the ecological footprint of whole sandwich-structured composites. This study focused on three eco-friendly lightweight core materials: balsa wood, paper honeycomb, and recycled PET foam. The effect of the hygrothermal ageing on their shear creep/recovery behaviour has been here investigated. Two different environmental conditions were tested: 23 °C-50% RH and 70 °C-65% RH. The results indicate that the maximum shear strain, the time-delayed strain and the residual strain increase for the three core materials with the severity of the hygrothermal conditions. This was attributed to the softening of the constitutive polymeric materials of the cell walls at temperatures close to 70 °C. The balsa wood exhibits the best creep resistance under the two environmental conditions. The identification of the viscoelastic properties highlights that the release times and the shear viscous parameters of the balsa wood and the PET foam depend on the stress level and the hygrothermal conditions.",

author = "Benjamin Sala and Xavier Gabrion and Thomas Jeannin and Fr{\'e}d{\'e}rique Trivaudey and Violaine Guicheret-Retel and Fabrizio Scarpa and Vincent Placet",

note = "Funding Information: The authors would like to acknowledge the funding received from the Bio Based Industries Joint Undertaking under the European Union's Horizon 2020 research and innovation program under grant agreement No 744349? SSUCHY project. The authors would also like to thank Armacell Company for providing the rPET foam. This work has also been supported by the EIPHI Graduate school (contract ?ANR-17-EURE-0002?). Funding Information: The authors would like to acknowledge the funding received from the Bio Based Industries Joint Undertaking under the European Union's Horizon 2020 research and innovation program under grant agreement No 744349– SSUCHY project. The authors would also like to thank Armacell Company for providing the rPET foam. This work has also been supported by the EIPHI Graduate school (contract {"}ANR-17-EURE-0002{"}). Publisher Copyright: {\textcopyright} 2021",

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AU - Guicheret-Retel, Violaine

AU - Scarpa, Fabrizio

AU - Placet, Vincent

N1 - Funding Information: The authors would like to acknowledge the funding received from the Bio Based Industries Joint Undertaking under the European Union's Horizon 2020 research and innovation program under grant agreement No 744349? SSUCHY project. The authors would also like to thank Armacell Company for providing the rPET foam. This work has also been supported by the EIPHI Graduate school (contract ?ANR-17-EURE-0002?). Funding Information: The authors would like to acknowledge the funding received from the Bio Based Industries Joint Undertaking under the European Union's Horizon 2020 research and innovation program under grant agreement No 744349– SSUCHY project. The authors would also like to thank Armacell Company for providing the rPET foam. This work has also been supported by the EIPHI Graduate school (contract "ANR-17-EURE-0002"). Publisher Copyright: © 2021

PY - 2022/2/15

Y1 - 2022/2/15

N2 - The development of sustainable sandwich materials is needed in the transportation sector to address environmental concerns related to the production and operation of vehicles. In addition to biobased composite skins, alternatives to classic synthetic core materials must be found to reduce the ecological footprint of whole sandwich-structured composites. This study focused on three eco-friendly lightweight core materials: balsa wood, paper honeycomb, and recycled PET foam. The effect of the hygrothermal ageing on their shear creep/recovery behaviour has been here investigated. Two different environmental conditions were tested: 23 °C-50% RH and 70 °C-65% RH. The results indicate that the maximum shear strain, the time-delayed strain and the residual strain increase for the three core materials with the severity of the hygrothermal conditions. This was attributed to the softening of the constitutive polymeric materials of the cell walls at temperatures close to 70 °C. The balsa wood exhibits the best creep resistance under the two environmental conditions. The identification of the viscoelastic properties highlights that the release times and the shear viscous parameters of the balsa wood and the PET foam depend on the stress level and the hygrothermal conditions.

AB - The development of sustainable sandwich materials is needed in the transportation sector to address environmental concerns related to the production and operation of vehicles. In addition to biobased composite skins, alternatives to classic synthetic core materials must be found to reduce the ecological footprint of whole sandwich-structured composites. This study focused on three eco-friendly lightweight core materials: balsa wood, paper honeycomb, and recycled PET foam. The effect of the hygrothermal ageing on their shear creep/recovery behaviour has been here investigated. Two different environmental conditions were tested: 23 °C-50% RH and 70 °C-65% RH. The results indicate that the maximum shear strain, the time-delayed strain and the residual strain increase for the three core materials with the severity of the hygrothermal conditions. This was attributed to the softening of the constitutive polymeric materials of the cell walls at temperatures close to 70 °C. The balsa wood exhibits the best creep resistance under the two environmental conditions. The identification of the viscoelastic properties highlights that the release times and the shear viscous parameters of the balsa wood and the PET foam depend on the stress level and the hygrothermal conditions.

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JO - Composites Part B: Engineering

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Effect of hygrothermal ageing on the shear creep behaviour of eco-friendly sandwich cores

Abstract

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