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A platform for research: civil engineering, architecture and urbanism
Structural dynamics of smart laminated composite cylindrical shells
Smart laminated composite cylindrical shells are widely used in many engineering applications such as aerospace, mechanical, civil, and marine structures. Dynamics (wave propagation and vibration) analysis of smart laminated composite shell structures plays an important role in design and fabrication of such structures. Understanding the dynamic characteristics of composite structures can be used for detecting possible defects in a structure and monitoring its structural integrity. Proper dynamics analysis of composite cylindrical shells has significant importance in accurate determination of wave propagation and vibration characteristics. In this thesis, a set of mathematical models is developed to model wave propagation and free vibration in smart laminated composite cylindrical shells reinforced with fibers with different sizes and arrangements based on different shell theories. The resulting effective material properties for composite structures reinforced with carbon nanotubes are estimated using the Mori-Tanaka micromechanics model. The hygrothermal environmental conditions are also considered in the proposed models. Wave dispersion and free vibration analyses are performed by solving an eigenvalue problem and finding the wave phase velocities and natural frequencies for different wave and vibration modes. Through numerical simulations, the effects of various parameters such as hygrothermal environmental conditions, axial and circumferential wavenumbers, arrangement and distribution of reinforcing fibers and carbon nanotubes, stacking sequence of the laminate, shell geometry parameters, piezoelectricity, and mechanical boundary conditions on the dynamic characteristics of different composites are examined. It is concluded that the shear effects on wave dynamics of smart laminated composite cylindrical shells are much more noticeable than its effects on wave dynamics of smart isotropic cylindrical shells. Furthermore, the effects of reinforcing fibers and carbon nanotubes and their volume fraction and ...
Structural dynamics of smart laminated composite cylindrical shells
Smart laminated composite cylindrical shells are widely used in many engineering applications such as aerospace, mechanical, civil, and marine structures. Dynamics (wave propagation and vibration) analysis of smart laminated composite shell structures plays an important role in design and fabrication of such structures. Understanding the dynamic characteristics of composite structures can be used for detecting possible defects in a structure and monitoring its structural integrity. Proper dynamics analysis of composite cylindrical shells has significant importance in accurate determination of wave propagation and vibration characteristics. In this thesis, a set of mathematical models is developed to model wave propagation and free vibration in smart laminated composite cylindrical shells reinforced with fibers with different sizes and arrangements based on different shell theories. The resulting effective material properties for composite structures reinforced with carbon nanotubes are estimated using the Mori-Tanaka micromechanics model. The hygrothermal environmental conditions are also considered in the proposed models. Wave dispersion and free vibration analyses are performed by solving an eigenvalue problem and finding the wave phase velocities and natural frequencies for different wave and vibration modes. Through numerical simulations, the effects of various parameters such as hygrothermal environmental conditions, axial and circumferential wavenumbers, arrangement and distribution of reinforcing fibers and carbon nanotubes, stacking sequence of the laminate, shell geometry parameters, piezoelectricity, and mechanical boundary conditions on the dynamic characteristics of different composites are examined. It is concluded that the shear effects on wave dynamics of smart laminated composite cylindrical shells are much more noticeable than its effects on wave dynamics of smart isotropic cylindrical shells. Furthermore, the effects of reinforcing fibers and carbon nanotubes and their volume fraction and ...
Structural dynamics of smart laminated composite cylindrical shells
2020-07-03
Theses
Electronic Resource
English
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