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Buckling of composite cylindrical shells

03/10/2010
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Since we learned that two fibers, namely carbon (graphite) and glass, are well-known in industry, we decided to investigate how much savings we would gain if we apply such fibers to a pipeline subjected to axial compressive loading. It turned out, as expected, that carbon/epoxy has higher strength-to-weight ratio compared to glass/epoxy.

We published our theoretical works in Journal of Indonesian Oil and Gas in 2006. The title, we admit, is a little bit lengthy:

Buckling of Isotropic and Composite Cylindrical Shells under Axial Loading: Can Composite Save Weight?

Abstract. This paper deals with degree of weightsaving that can be achieved by composite materials when they are used to build cylindrical shells. Cylindrical shells are subjected to axial compressive load, and critical buckling load is calculated using linear theory. The linear theory for both isotropic and composite cylindrical shells is employed, and isotropic, i.e. steel, cylindrical shells is used as a benchmark in this exercise. Two types of well-known composite systems, i.e. carbon/epoxy and glass/epoxy, are used and simple optimization is made to evaluate the degree of weight saving. Two types of stacking sequence, namely cross-ply [0/0/90/90]s and quasi isotropic [0/45/-45/90]s, are proposed, and weight of each stacking sequence is evaluated.

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