Fracture behaviour of foam core sandwich structures with manufacturing defects using phase-field modelling

Xing-Yuan Miao, Renchao Lu, Xiao Chen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

This study investigates fracture behaviour of sandwich structures with foam core slits. These slits are typically machined in the foam core materials to improve manufacturability but inevitably lead to material discontinuities such as resin-starving regions or voids. Using the phase-field modelling method, which does not require the exact location of crack initiation or the crack path known as a prior, the complex fracture process of sandwich structures with different resin-filling slits in the foam core materials is numerically reproduced. We examine the effective stiffness, the peak force, the displacement at crack initiation, and the dissipated energy during fracture of the sandwich structure under shear loads following the ASTM C273 test standard. It is found that the sandwich structure with fully or partly resin filled slits in the foam core exhibits better fracture resistance than the ones with the intact foam and with unfilled slits. The sandwich structure with partly resin filled slits also shows good ductility due to the presence of voids. The effects of the number of slits, slit spacing and foam core density on the load-carrying capacity and fracture resistance are also examined, providing insights into fracture behaviour and damage tolerance of foam core sandwich structures with manufacturing defects.
Original languageEnglish
Article number114294
JournalComposite Structures
Volume274
Number of pages11
ISSN0263-8223
DOIs
Publication statusPublished - 2021

Keywords

  • Damage tolerance
  • Crack propagation
  • Sandwich structures
  • Phase-field modelling
  • Interface
  • Manufacturing

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