The Effect of Geometry on the Flexural Properties of Cellular Structures Reinforced with Natural Fibres: Statistical Approach

Abstract

ABSTRACT New concepts of honeycomb structures were developed. These new cellular structures, known as honeycomb (HN), reentrant honeycomb (RE-HN) and silicomb (Silico) are made from new solid polymer matrix reinforced with natural fibers resulting in biocomposites that are innovative and sustainable for a variety of engineering applications. In order to elaborate these biocomposites structures, PLA (Polylactic Acid) molds were made using a 3D printer. Then, the flexural behavior of honeycomb, reentrant and silicomb structures reinforced by various natural fibers like flax, jute and sisal using various fibers volume fractions of 10, 20 and 30% was investigated. Taguchi plan (L9) experiments were conducted to determine how each factor affects bending stress, displacement and flexural modulus. Bending stress values varied from 24.66 to 36.53 MPa while flexural modulus values from 3.58 to 17.17 GPa. Moreover, it was found that fiber volume fraction had significant influence on flexural properties and on fracture resistance. The silicomb structure has a higher load capacity than the honeycomb and reentrant structures. In fact, this type of biocomposite structure with low density and good mechanical properties are intended for many packaging and furnishing applications with a lower impact on the environment.