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In this paper, three different fiber polyester composites (glass fiber,carbon fiber and hemp fiber) were separately prepared via pultrusion method.Then, a Non Destructive Acoustic Test (NDAT) based on longitudinal freevibration was utilized to measure viscoelastic properties of resultantcomposites. Also, the way to obtain composites' elastic modulus was discussedin details. The results showed a tremendous agreement between destructivemechanical methods and NDAT method based on longitudinal free vibration.Furthermore, this method revealed an excellent repeatability

Non-Destructive Acoustic Test (NDAT) to Determine Elastic Modulus of Polymeric Composites