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Free Vibrations Of Delaminated Composite Cylindrical Shell Roofs

  • A. Kumar Acharyya
  • Dipankar Chakraborty
  • Amit Karmakar
Part of the Springer Proceedings in Physics book series (SPPHY, volume 126)

Recently laminated composites are widely used in civil engineering, which may suffer from delamination damage resulting from improper fabrication and overloading at service. A review of literature that exists on composite shells reveals that the research reports on delaminated shells are very few in number. Hence the present endeavor is to work on delaminated simply supported cylindrical shell with different extents of delaminations. An eight noded isoparametric element with five degrees of freedom per node is used together with Sander's strain displacement relationships and multipoint constraint equations to satisfy the compatibility of displacements and rotations along the cracked edges. The study reveals that there is a consistent decrease in the fundamental frequency value as the area of the delamination damage increases. Further the fundamental frequency of angle ply shells undergo relatively more prominent decrease compared to that of cross ply shells. It seems that delamination damage brings about greater reduction in frequency values as the number of layers increases for angle ply shells, especially for symmetric ones.

Keywords

delamination cylindrical shell finite element laminated composite fundamental frequency 

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References

  1. 1.
    C. K. Gim, 1994. Plate finite element modeling of laminated plates, Computers & Structures 52,157– 168.MATHCrossRefGoogle Scholar
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    P. K. Parhi, 2000. Finite element dynamic analysis of multiple delaminated composite plates and shells, PhD Thesis.Google Scholar
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    A. Karmakar, H. Roy and K. Kishimoto, 2005. Free vibration analysis of delaminated composite pretwisted shells, Aircraft Engineering and Aerospace Technology: An International Journal, 77, 486– 490.CrossRefGoogle Scholar

Copyright information

© Springer Science + Business Media B.V 2008

Authors and Affiliations

  • A. Kumar Acharyya
    • 1
  • Dipankar Chakraborty
    • 1
  • Amit Karmakar
    • 1
  1. 1.Department of Mechanical EngineeringJadavpur UniversityKolkataIndia

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