eng Science and Education Publishing American Journal of Mechanical Engineering 2328-4110 2021-10-28 9 1 41 56 10.12691/ajme-9-1-5 AJME2021915 article Mohannad Aziz Kadhom mohannad_a_kadhom@atu.edu.iq 1 Luay S. Al-Ansari 2 Faeq Hamid Gburi 2 Technical Institute of AL-Diwaniyah, AL-Furat Al-Awsat Technical University (ATU), Diwaniyah, Iraq Mechanical Engineering Department, Faculty of Engineering, University of Kufa, Kufa 54002, Iraq This study is presented of two models were built to simulate the skew composite plates and these models are SHELL281 and SOLID186 element. Three types of laminates arrangement were used to study the effect of skew angle, fiber orientation and length-to-width ratio on the first five natural frequencies of the clamped composite plates. The skew angle was changed from (0°) to (75°) with (15°) steps while the fiber orientation was changed from (0°) to (90°) with (15°) steps and the length-to-width ratio was (0.5, 1, 1.25, 1.5 and 2). The results showed that the first five frequency parameters increase for three layouts when the skew angle increases at constant fiber orientation and constant length-to-width ratio. Also, the fiber orientation has a slight effect on the first five frequency parameters in (0/¦Â/0) layout. The effect of length-to-width ratio on the first five frequency parameters depends on the skew angle (smaller or larger than (60o)), fiber orientation and the laminates layout. Finally, the values of the first five frequency parameters of (¦Â/0/¦Â) and (¦Â/¦Â/¦Â) layouts are close to each other. http://pubs.sciepub.com/ajme/9/1/5/ajme-9-1-5.pdf free vibration skew plate frequency parameter length-to-width ratio ANSYS software composite plate finite element method