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Flutter of geometrical imperfect functionally graded carbon nanotubes doubly curved shells
Abstract In this paper, flutter of geometrical imperfect functionally graded carbon nanotubes (FG-CNTs) doubly curved shell subjected to a supersonic flow is investigated. For this purpose, the imperfect doubly curved shell is reinforced by four different carbon nanotubes (CNTs) distributions in the thickness direction. The Hill’s elastic moduli are used to obtain the effective material properties of FG-CNTs doubly curved shell. The piston aerodynamic theory and von Karman geometrical nonlinearity terms are used to study large deflection flutter analysis of FG-CNTs imperfect shell. The effect of different parameters including large deflection, geometrical imperfection and CNTs volume fraction on critical flutter pressure of doubly curved shells are studied. According to the results, distributions with poor CNTs in the middle of thickness are more efficient in improving critical flutter pressure. Additionally, the effect of shell imperfection on flutter pressure is more considerable than CNTs volume fraction and distributions.
Highlights Aeroelastic stability of functionally graded carbon nanotubes composite shell is presented. The effect of geometrical imperfection is considered. The Hill’s elastic coefficients are used to obtain effective material properties. He’s homotopy perturbation method is utilized to predict critical flutter pressure. The effect of large deflection is considered.
Flutter of geometrical imperfect functionally graded carbon nanotubes doubly curved shells
Abstract In this paper, flutter of geometrical imperfect functionally graded carbon nanotubes (FG-CNTs) doubly curved shell subjected to a supersonic flow is investigated. For this purpose, the imperfect doubly curved shell is reinforced by four different carbon nanotubes (CNTs) distributions in the thickness direction. The Hill’s elastic moduli are used to obtain the effective material properties of FG-CNTs doubly curved shell. The piston aerodynamic theory and von Karman geometrical nonlinearity terms are used to study large deflection flutter analysis of FG-CNTs imperfect shell. The effect of different parameters including large deflection, geometrical imperfection and CNTs volume fraction on critical flutter pressure of doubly curved shells are studied. According to the results, distributions with poor CNTs in the middle of thickness are more efficient in improving critical flutter pressure. Additionally, the effect of shell imperfection on flutter pressure is more considerable than CNTs volume fraction and distributions.
Highlights Aeroelastic stability of functionally graded carbon nanotubes composite shell is presented. The effect of geometrical imperfection is considered. The Hill’s elastic coefficients are used to obtain effective material properties. He’s homotopy perturbation method is utilized to predict critical flutter pressure. The effect of large deflection is considered.
Flutter of geometrical imperfect functionally graded carbon nanotubes doubly curved shells
AminYazdi, Ali (author)
Thin-Walled Structures ; 164
2021-04-04
Article (Journal)
Electronic Resource
English
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