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BALLISTIC PROPERTIES OF NOVEL EPOXY COMPOSITE REINFORCED WITH SEDGE FIBERS (CYPERUS MALACCENSIS) USED AS A STANDALONE TARGET AGAINST A 7.62 AMMUNITION
Belayne Zanini Marchi1; Lucas Neuba1; Elias Matias Bentes1; Sarah De Melo1; Sergio Monteiro1; Marc Meyers2
1Military Institute of Engineering, Rio de Janeiro, Brazil; 2University of California San Diego, La Jolla, United States

PAPER: 48/Composite/Regular (Oral) OS
SCHEDULED: 15:05/Tue. 18 Nov. 2025/Dusit 1

ABSTRACT:

A growing demand for research about ballistic armor shields follows the increase of violence around the world. Ultimately, different composite materials with polymeric matrices have already presented the minimum performance as an individual protection required with cheaper and lower density, such as those reinforced with natural lignocellulosic fiber (NLF). The Cyperus malaccensis, a type of sedge fiber, is already used in simple items like ropes, furniture, and paper, but has not yet been investigated as composite reinforcement for possible ballistic protection applications. Therefore, composite plates were prepared for the ballistic tests, one for each condition of 10, 20 and 30 vol% sedge fibers. Each plate has been subjected to 5 test-shots  using 7.62 mm commercial ammunition. The fibers were embedded under pressure in the epoxy resin matrix and cured at room temperature for 24 hours. The tested specimens were examined by scanning electron microscopy. Besides, analysis of variance was performed and the absorbed energy of all specimens were evaluated.