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

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 free vibration was utilized to measure viscoelastic properties of resultant composites. Also, the way to obtain composites' elastic modulus was discussed in details. The results showed a tremendous agreement between destructive mechanical methods and NDAT method based on longitudinal free vibration. Furthermore, this method revealed an excellent repeatability.