L. S. Al-Ansari, M. Al-Waily, and A. M. H. Al-Hajjar, “Experimental and Numerical Study of Crack Effect on Frequency of Simple Supported Beam”, alkej, vol. 8, no. 2, pp. 30–41, May 2012, Accessed: Jan. 04, 2026. [Online]. Available: https://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/127