Abstarct
Hand lay-up method was used to prepare sheets of epoxy (EP) reinforced with 12 layers of(0 -90 ) glass fiber mat with volume fraction equal to 30%. The sheets of Ep- glass fiber composite werecut to samples with standard dimensions for charpy impact test. The main objective of this research was tostudy the effect of water absorption on impact strength for epoxy-12 glass fiber composite. Diffusivitybehavior and diffusion coefficient were investigated. The samples were dividing to three groups immersedin distilled water for different time, the first group 15 days ,the second group 27 days and the last 39 days atconstant temperature(±20)C the mass gain recorded every 3 days till saturation (M ) after that the massgain decreased .the results showed that the maximum diffusion coefficient (minimum absorption resistance) was for sample (A),while the minimum diffusion coefficient (maximum absorption resistance) was forsample (C). The impact strength has been investigated for samples before and after the immersion indistilled water for different time. The results show that the impact strength decreased with increasing thetime of immersion for samples
