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From:
Ashkan Vaziri, Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, United States, “On the buckling of cracked composite cylindrical shells under axial compression”, Composite Structures 80 (2007). 152–158.
ABSTRACT: Potential sensitivity of the buckling behavior of cracked composite cylindrical shells to service life cracking is explored by carrying out linear buckling analysis. Computational models of cracked composite cylindrical shells are developed by exploiting a special meshing scheme in which the element size is reduced incrementally from the element size employed in the uncracked region by approaching the crack tip. The effect of crack size and orientation, as well as the composite ply angle on the buckling behavior of cylindrical shells under axial compression is investigated. The results provide some insight into designing a composite laminate, which enhances the load capacity of cylindrical shells and minimizes their potential sensitivity to the presence of defects.
Fig. 3. (a) Variation of the first normalized buckling load associated with local buckling of a circumferentially cracked cylindrical shell vs the composite ply angle for various crack lengths. Inset: schematic of a circumferentially cracked cylindrical shell. (b) Typical first local buckling shape of a cracked cylindrical shell comprising a circumferential through crack. The composite cylindrical shell has the ply sequence of [θ/−θ]3.
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