scholarly journals Optimal design of laminated composite cylindrical shells for maximum fundamental frequency using sequential permutation search with mode identification

2021 ◽  
pp. 114736
Author(s):  
Zhao Jing
Keyword(s):  
Optimal Design ◽  
Fundamental Frequency ◽  
Cylindrical Shells ◽  
Laminated Composite ◽  
Mode Identification ◽  
Composite Cylindrical Shells

Free vibration analysis of hybrid laminated composite cylindrical shells reinforced with shape memory alloy fibers

2019 ◽  
Vol 26 (7-8) ◽  
pp. 610-626
Author(s):  
Morteza Nekouei ◽  
Mehdi Raghebi ◽  
Meisam Mohammadi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Fundamental Frequency ◽  
Volume Fraction ◽  
Cylindrical Shells ◽  
Shear Deformation Theory ◽  
Laminated Composite ◽  
Free Vibration Analysis ◽  
Constitutive Law ◽  
Composite Cylindrical Shells

In the present paper, vibration behavior of hybrid laminated composite cylindrical shells reinforced with shape memory alloy fibers is investigated. Material properties of shape memory alloy fibers and composites are accurately considered temperature dependent. Thermo-mechanical properties of shape memory alloy fibers with uniform temperature change are calculated using Brinson’s one-dimensional constitutive law. Love’s first approximation and first-order shear deformation theory of shells with the von Kármán type of geometrical non-linearity are used in conjunction with Hamilton’s principle for deriving the equations of motion. The generalized differential quadrature method is employed to solve the coupled partial differential equations. The effects of pre-strain, volume fraction, phase transformation, location of shape memory alloy fibers, boundary conditions and temperature on the fundamental frequency of the hybrid laminated composite cylindrical shells are studied. Results indicate that a small amount of shape memory alloy fibers significantly increases the fundamental frequency and vibration control of the hybrid laminated composite reinforced with shape memory alloy hybrid laminated composite cylindrical shells.

On Crack Growth in Composite Cylindrical Shells

1999 ◽  
Author(s):  
Hayder A. Rasheed ◽  
John L. Tassoulas
Keyword(s):  
Energy Release Rate ◽  
Energy Release ◽  
Crack Growth ◽  
Release Rate ◽  
Cylindrical Shells ◽  
Applied Pressure ◽  
Fluid Pressure ◽  
Laminated Composite ◽  
Stable Crack Growth ◽  
Composite Cylindrical Shells

Abstract Interfacial defects, in the form of cracks or layer separation, may occur in composite cylindrical shells during the manufacturing process, transportation or service life. Such defects are expected to affect the integrity of laminated composite structural elements and may reduce their capacity to resist the applied loads. In this article, the growth of pre-existing cracks in moderately thick composite cylinders is studied for the case of externally applied fluid pressure. The cracks considered separate thick layers, which are unlikely to buckle locally prior to the final collapse of the structural component. The potential of growth is assessed by computing the energy release rate. It is found that any initial out-of roundness imperfection introduces a shear force at the crack tip by causing the cross section to ovalize slightly. The energy release rate is found to vary exponentially with the applied pressure, when geometric nonlinearities are considered. The analysis is applied to a carbon/glass-fiber hybrid composite tube and the parameters influencing growth are examined. Crack length, through the thickness location, circumferential location relative to the ovalization orientation and the amount of imperfection are found to control the nature of growth. Unstable as well as stable crack growth and arrest cases are observed for various combinations of these parameters.

scholarly journals Thermo-Mechanical Instability Characteristics of Laminated Composite Cylindrical Shells

2017 ◽  
Vol 214 ◽  
pp. 76-85
Author(s):  
Periyasamy Manikandan ◽  
Sunil Chandrakant Joshi ◽  
Armando Pinter
Keyword(s):  
Cylindrical Shells ◽  
Laminated Composite ◽  
Mechanical Instability ◽  
Composite Cylindrical Shells
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