Residual bending behaviour of sandwich composites after impact

Ismet Baran (Corresponding Author), Wouter Weijermars

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
42 Downloads (Pure)

Abstract

This work investigates the residual mechanical behaviour of composite sandwich panels in bending after impact loading conditions. The sandwich panels were made of an epoxy/glass face sheet with three different core materials: styrene acrylonitrile foam, polyethylene terephthalate foam and Balsa wood. A three-point bending test was performed in order to determine the reference stiffness. A low-velocity impact test and thereafter the three-point bending test were performed with the same specimens. The failure modes during bending tests were captured using a high-speed camera. It was found that multiple shear cracks with progressive failure were present in the core of styrene acrylonitrile and polyethylene terephthalate panels in bending after impact tests, whereas single shear crack with sudden failure was the case for Balsa panels. The initial bending stiffness decreased approximately 30.5, 35.2 and 55.6% for Balsa, styrene acrylonitrile and polyethylene terephthalate panels, respectively, in bending after impact tests due to the influence of the pre-damage from the low-velocity impact tests. The reduction in collapse force was also quantified for Balsa, styrene acrylonitrile and polyethylene terephthalate panels as 22.8, 4.9 and 22.1%, respectively.

Original languageEnglish
JournalJournal of Sandwich Structures & Materials
DOIs
Publication statusPublished - 2018

Fingerprint

Acrylonitrile
Polyethylene Terephthalates
Styrene
Polyethylene terephthalates
Bending tests
Composite materials
Foams
Stiffness
Cracks
High speed cameras
Failure modes
Wood
Glass

Keywords

  • UT-Hybrid-D
  • bending
  • glass/epoxy
  • low-velocity impact
  • polyethylene terephthalate foam
  • Residual strength
  • sandwich composite
  • styrene acrylonitrile foam
  • Balsa core

Cite this

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title = "Residual bending behaviour of sandwich composites after impact",
abstract = "This work investigates the residual mechanical behaviour of composite sandwich panels in bending after impact loading conditions. The sandwich panels were made of an epoxy/glass face sheet with three different core materials: styrene acrylonitrile foam, polyethylene terephthalate foam and Balsa wood. A three-point bending test was performed in order to determine the reference stiffness. A low-velocity impact test and thereafter the three-point bending test were performed with the same specimens. The failure modes during bending tests were captured using a high-speed camera. It was found that multiple shear cracks with progressive failure were present in the core of styrene acrylonitrile and polyethylene terephthalate panels in bending after impact tests, whereas single shear crack with sudden failure was the case for Balsa panels. The initial bending stiffness decreased approximately 30.5, 35.2 and 55.6{\%} for Balsa, styrene acrylonitrile and polyethylene terephthalate panels, respectively, in bending after impact tests due to the influence of the pre-damage from the low-velocity impact tests. The reduction in collapse force was also quantified for Balsa, styrene acrylonitrile and polyethylene terephthalate panels as 22.8, 4.9 and 22.1{\%}, respectively.",
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Residual bending behaviour of sandwich composites after impact. / Baran, Ismet (Corresponding Author); Weijermars, Wouter.

In: Journal of Sandwich Structures & Materials, 2018.

Research output: Contribution to journalArticleAcademicpeer-review

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