Experimental Study of Flexural Strength of Laminate Composite Material

Abstract

The effect of fiber volume fraction on the flexural properties of thelaminated composite test specimens constructed of two layers, one of themreinforced with glass fiber and the other layer reinforced with Kevlar fiberhas been investigated experimentally.The results illustrate that tension stress decreases with the increase infiber volume fraction of glass fiber of the lower layer while it increases withthe increase of Kevlar volume fraction of the upper layer. As for compressionstress, it increases with the increase in volume fraction of glass fiber of thelower layer while it decreases with the increase of volume fraction of Kevlarfiber of the upper layer.The results also show the maximum value of tension stress (= 25.3MPa.) at Vf of Glass fiber (= 15 %) and Vf of Kevlar fiber (= 60 %), while themaximum value of compression stress (= -17.1 MPa.) at Vf of Glass fiber (= 60%) and Vf of Kevlar fiber (= 15 %).