Alüminyum-mineral kompozit kirişlerin ve plakaların mekanik ve dinamik analizi

Frame structures are widely used in aerospace, maritime industries, construction, etc. These structures are subjected to static and dynamic loads, which may cause buckling, dynamic instability, or resonance. Hence, it is essential to determine the right material and understand the mechanic and dynamic properties of such structures. This thesis investigates the free vibration, buckling, and dynamic stability of isotropic and orthotropic curved beam and plate frame structures using the finite element method and beam or plate theory. The effects of the radius of curvature and stacking order of the single-bay and two-bay curved frame structures on the natural frequency, critical buckling load, and unstable regions are investigated. Similarly, the effects of the aspect ratio on the dynamic and buckling characteristics of the curved frame structures are examined. Besides, the effects of the thickness on the natural frequency and critical buckling load of the isotropic curved beam frame structure are investigated. Euler – Bernoulli Beam Theory and Classical Plate Theory is employed with the Finite Element Method to obtain isotropic and orthotropic beam frame structures. Curved plate frame structures are modeled considering Kirchhoff – Love Plate Theory for isotropic frames, whereas the Classical Plate Theory and First-Order Shear Deformation Theory for orthotropic frames. Results are validated with those of ANSYS and SolidWorks. Aluminum – potassium feldspar metal matrix composite materials are fabricated via the stir casting method. The mechanical properties of such materials are obtained by tensile testing. Free vibration, buckling, and dynamic stability analyses are performed considering a plate of such material.