Effect of orientation angles on vibration properties at carbon fiber reinforced polymeric composites

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In this study, composite plates with dimensions of 300x300mm wereproduced by VARTM (Vacuum Assisted Resin Transfer Molding) method usingunidirectional carbon fiber fabrics. The composite plates were producedsymmetrically at four different orientations ((0°)4,(60°/-30°)S,(45°/-45°)S,(0°/90°)S) and four layered. Required specimens according tothree-point bending and vibration tests related ASTM standards for were cutfrom produced plates. The maximum flexural stresses of the specimens weredetermined by performing three-point bending tests. Free vibration tests underfixed-free boundary conditions were performed to determine their naturalfrequencies and damping ratios. As a result of the tests, specimens with (0°)4directional angles were found to have the highest bending strength. Also,composite specimens with orientation angles (0°)4 have the highestnatural frequencies and lowest damping ratios. (45°, -45°)S, thenatural frequency values were the lowest while the damping ratio values werefound to be the highest.