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Thin cylindrical shell structures are in general highly efficient structures and they have wide a... more Thin cylindrical shell structures are in general highly efficient structures and they have wide applications in most branches of engineering. The thin cylindrical shell structures are prone to a large number of imperfections, due to their manufacturing defects and regular use.
These imperfections affect the load carrying capacity of these shells. The imperfections which affect the strength of thin cylindrical shells are grouped into three major categories.
They are,
(i)geometrical (for example, out-of-straightness, initial ovality and geometrical eccentricities, dents, swells, circularity etc.) .
(ii)structural (small holes, cut outs, rigid inclusions, residual stresses) .
(iii) loadingimperfections (non-uniform edge load distribution, unintended edge moments, load eccentricities and load misalignments as well as imperfect boundary conditions).
Out of all these imperfections, the geometrical imperfections are more dominant in determining the load carrying capacity of thin cylindrical shells. Reliable prediction of buckling strength of these structures is important because the buckling failure is catastrophic in nature.
Several studies have been reported in the literature which deals with the effect of imperfections on buckling strength of thin shell structures. Arbocz and Babcock (1969) have studied experimentally buckling of cylindrical shells subjected to general imperfections. They have shown that huge reduction of the buckling
critical load could be obtained. Koiter (1982) has given a review study about the effect of geometric imperfections on shell buckling strength. Other extensive investigations have considered the problem of shell buckling where analysis of the effects of distributed or localised imperfections on reduction of the buckling load has been performed (Yamaki, 1984; Arbocz, 1987; Bushnell, 1989 and God-
oy, 1993). Kim and Kim (2002) have considered a generalised initial geometric imperfection having a modal superposition form.
By using Donnell shell theory, (Donnell, 1934, 1976), they have studied the buckling strength of cylindrical shells and tanks subjected to axially compressive loads on soft or rigid foundations, they have found that the buckling load decreases significantly as the amplitude of initial geometric imperfection increases.
The above mentioned references have assessed, in all cases, that imperfections reduce drastically the buckling load of elastic cylindrical shells when subjected to axial compression. The obtained reduction depends on the nature of initial geometric imperfection that was considered.

Thin cylindrical shell structures are in general highly efficient structures and they have wide a... more Thin cylindrical shell structures are in general highly efficient structures and they have wide applications in most branches of engineering. The thin cylindrical shell structures are prone to a large number of imperfections, due to their manufacturing defects and regular use.
These imperfections affect the load carrying capacity of these shells. The imperfections which affect the strength of thin cylindrical shells are grouped into three major categories.
They are,
(i)geometrical (for example, out-of-straightness, initial ovality and geometrical eccentricities, dents, swells, circularity etc.) .
(ii)structural (small holes, cut outs, rigid inclusions, residual stresses) .
(iii) loadingimperfections (non-uniform edge load distribution, unintended edge moments, load eccentricities and load misalignments as well as imperfect boundary conditions).
Out of all these imperfections, the geometrical imperfections are more dominant in determining the load carrying capacity of thin cylindrical shells. Reliable prediction of buckling strength of these structures is important because the buckling failure is catastrophic in nature.
Several studies have been reported in the literature which deals with the effect of imperfections on buckling strength of thin shell structures. Arbocz and Babcock (1969) have studied experimentally buckling of cylindrical shells subjected to general imperfections. They have shown that huge reduction of the buckling
critical load could be obtained. Koiter (1982) has given a review study about the effect of geometric imperfections on shell buckling strength. Other extensive investigations have considered the problem of shell buckling where analysis of the effects of distributed or localised imperfections on reduction of the buckling load has been performed (Yamaki, 1984; Arbocz, 1987; Bushnell, 1989 and God-
oy, 1993). Kim and Kim (2002) have considered a generalised initial geometric imperfection having a modal superposition form.
By using Donnell shell theory, (Donnell, 1934, 1976), they have studied the buckling strength of cylindrical shells and tanks subjected to axially compressive loads on soft or rigid foundations, they have found that the buckling load decreases significantly as the amplitude of initial geometric imperfection increases.
The above mentioned references have assessed, in all cases, that imperfections reduce drastically the buckling load of elastic cylindrical shells when subjected to axial compression. The obtained reduction depends on the nature of initial geometric imperfection that was considered.