Determination of mechanical and damping properties of hazelnut shell powder reinforced biocomposites by ultrasonic method

This research was carried out to figure the effect of chemical treatments hazelnut shell powders (HSPs) on elastic properties, ultrasonic wave velocities, and damping properties bio-based epoxy resin (BER) biocomposites. Natural shells (HSs) were chemically treated using sodium hydroxide (NaOH), acetic anhydride (AA). Then, HSs that with NaOH AA, not subjected treatment ground obtain HSPs. The HSPs (HSP-NaOH HSP-AA), untreated contributed neat BER in varied compositions such as 10–50 wt% BER/HSP, BER/HSP-NaOH, BER/HSP-AA untreated, HSP ratios density, Young's modulus, Bulk Shear Poisson ratio, microhardness, characteristics (attenuation coefficient, loss tangent quality factor) novel HSP-based biocomposites, investigated by pulse-echo overlap method (PEOM). A significant increase modulus values biocomposites seen compared BER. Based obtained values, most appropriate combination ratio between BER, HSP-NaOH determined 50:50.