Failure mechanisms in carbon - Geopolymer sandwich structures

James Giancaspro, P. Balaguru, Richard Lyon

Research output: Contribution to journalConference articlepeer-review


The results presented in this paper deal with balsa sandwich beams manufactured using an inorganic resin known as Geopolymer to bond the carbon reinforcement to the core. The primary focus of this paper is the observed failure mode of the sandwich beam and the influencing variables. The primary variables investigated include the type, amount, and location of the carbon reinforcement. A brief comparison is made between the failure modes of the balsa beams reinforced with inorganic composite with those reinforced with organic composite. Seventy balsa wood sandwich beams were prepared and tested in 4-point flexure to evaluate the failure mode. The results indicated that the bond between the inorganic carbon composite and the balsa wood is strong enough to prevent delamination, while that for the organic composite is poor. At low reinforcement (carbon area) ratios, the failure occurs by fracture of carbon. When the reinforcement ratio is increased beyond 0.75%, failure occurs at the compression region.

Original languageEnglish (US)
Pages (from-to)901-912
Number of pages12
JournalInternational SAMPE Symposium and Exhibition (Proceedings)
StatePublished - Dec 1 2005
Externally publishedYes
Event50th International SAMPE Symposium and Exhibition - Long Beach, CA, United States
Duration: May 1 2005May 5 2005


  • Carbon
  • Flexure
  • Sandwich Composites

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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