Characterization of Roselle fiber composites for low load bearing structures

The influence of weaving architecture on mechanical and dynamic mechanical properties of woven roselle fiber epoxy composite has been investigated. Plain, twill, satin, and basket type weaving patterns are considered for this study. Hand lay-up process is used to produce the woven composites. Mechanical tests (tensile, flexural, and impact test) and dynamic mechanical analysis are conducted according to ASTM standards for material characterization. Results revealed that basket type architecture of woven roselle fiber epoxy composite has better tensile, flexural, and impact strengths. Woven composites have improved storage modulus in comparison with neat epoxy. Woven composites have 3% to 15% lower glass transition temperature than that of neat epoxy. Scanning electron microscopy (SEM) analysis is carried out to correlate the experimental findings. SEM images showed evidence of fiber pullout and cracks near fiber bundle, which indicates non-uniform transfer of stress from fiber to the matrix.

Automated summary

The study demonstrates that the basket type architecture of woven roselle fiber epoxy composite exhibits superior mechanical properties. Woven composites have a lower glass transition temperature compared to neat epoxy.