In this article, in order to obtain better vibration characteristics of circular composite sandwich cylindrical shells (CCSCS), the free vibration and damping property of CCSCS has been performed with parameter analysis. First, the equations of motion of CCSCS are deduced by adopting a displacement continuous piece-wise model based on Hamilton's principle and first order shear theory, in which shear strain and rotary inertias of all layers are considered. Second, the exact Navier method is adopted to obtain the solutions of these vibration equations and is authenticated by comparison with the results of open literatures. Finally, the change rule of free vibration and damping property versus thickness, shear parameter, and some structure parameters ratios are presented graphically, then a series of valuable conclusion are proposed to make CCSCS obtain higher rigidity and damping property.
Because of the high strength, high modulus, and lightweight, carbon fiber reinforced epoxy composites have been extensively used in aerospace and high‐speed aircraft. In the present study, a high damping carbon fiber/epoxy (CF/EP) composites reinforced by microcapsule particles is prepared on the premise of guaranteeing the mechanical properties of CF/EP composites. Through flexural tests, interlayer shear tests, scanning electron microscopy, and vibration damping tests, the impacts of different components of microcapsules on the mechanical and damping properties of CF/EP are investigated. The microcapsule particles are composed of a polyurethane shell and internal silicone oil. The results demonstrate that the flexural, interlaminar shear properties and damping properties of CF/EP composites are effectively enhanced by appropriate amount of microcapsule particles. When the content is 3 vol%, the flexural strength of CF/EP composites is elevated by 1.68% with 734.392 MPa. In addition, the interlaminar shear strength of CF/EP composites is elevated by 4.91%, which is 42.8 MPa. Besides, the damping properties of CF/EP composites increase with the increasing content of microcapsule particles. When the content of microcapsule particles is 8 vol%, the damping ratio of CF/EP composites is elevated by 39.51%, which is 3.22%.
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