Dynamic Elastic Modulus Variability in Anisotropic and Isotropic Materials: Comparison by Acoustic Emission

This study compared the variation of dynamic elastic modulus (E) three types composite pipes made by filament winding process and a steel alloy specimen, according to signal source changes. The specimens were produced with different angles, i.e., ±50°, ±52.5°, ±55°. moduli obtained through known angular variation, two sensors positioned over specimen's surface. In previous article, in velocity acoustic emission (AE) signals, performed same type pipes, was discussed based on standards for glass fiber-reinforced epoxy (GFRE) wound specimens. work took these preliminary findings compare results found (SAE 1020). data used appropriate equations determine each material. It that, even small differences, changes position concerning lamination angle. Thus, lower quality control, final product materials. As expected, isotropic materials such as alloys, remains constant along while anisotropic ones, it is dependent principal directions stress strain, or other hand, correlation between wave AE signals.