Mechanical properties and damage characterization of triaxial braided composites in environmental conditions

Joel P. Johnston, Kuang C. Liu, Masoud Yekani Fard, Aditi Chattopadhyay

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Under environmental conditions, triaxial braided composites exhibit complex behavior and damage mechanisms. This paper investigates the damage mechanisms of these complex composites under varying environmental conditions. Tensile, compressive, and shear specimens of triaxial braided composite material were tested at room, hot (100?.,?), and hot/wet conditions (60?.,?/90% relative humidity). The strain field was studied using a digital image correlation system and the effect that the specimens' edges have on the strain field was quantified. For the tension specimens, the environmental conditions caused reductions in the elastic and failure properties, whereas the compression specimens exhibited degradation exclusively in the failure properties. An increase in temperature rather than humidity was found to be a driving factor for the degradation of the mechanical properties. A non-destructive, flash thermography technique was used to characterize surface/subsurface damage in the specimens. Scanning electron microscopy was conducted to determine the microstructural modes of failure.

Original languageEnglish (US)
Pages (from-to)67-80
Number of pages14
JournalJournal of Composite Materials
Issue number1
StatePublished - Jan 1 2017


  • composite
  • edge effect
  • environmental conditions
  • failure
  • mechanical properties
  • Triaxial braid

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Materials Chemistry


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