فهرس المقالات Periodic axial force حرية الوصول المقاله صفحة الملخص نص كامل 1 - Dynamic Response of Bi-Directional Functionally Graded Materials (BDFGMs) Beams Rested on Visco-Pasternak Foundation Under Periodic Axial Force A.A Ghorbanpour Arani S Niknejad A.A Abbasian Arani 10.22034/jsm.2020.678358