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First four buckling modes for (a) uncracked and (b) axially cracked axially compressed cylindrical shell

“The existence of the crack can totally change the buckling behavior from the global buckling to local buckling around the crack faces in a much lower value of critical applied stress.

FROM:
Amir Nasirmanesh and Soleil Mohammadi (High Performance Computing Lab, School of Civil Engineering, University of Tehran, Tehran, Iran),

“Eigenvalue buckling analysis of cracked functionally graded cylindrical shells in the framework of the extended finite element method”, Composite Structures, Vol. 159, pp 548-566, January 2017, https://doi.org/10.1016/j.compstruct.2016.09.065

ABSTRACT: In this study, eigenvalue buckling analysis for cracked functionally graded cylindrical shells is performed using eight noded degenerated shell elements in the framework of the extended finite element method. First, validity and efficiency of the proposed method in comparison with available results are examined and then the approach is utilized for examining cracked FGM cylindrical shells subjected to different loading conditions, including axial compression, axial tension and combined internal pressure and axial compression. Also, the effects of various parameters such as crack length and angle, gradient index of the material, aspect ratio of the cylinder and internal pressure on the buckling behavior are extensively investigated.

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