Geometric Design of Composite Cylindrical Characterization Specimens

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Abstract
The stress field within a highly anisotropic cylinder, even under simple loading conditions, is far from uniform. Thus, like other verbage which has its origins in the stress analysis of isotropic bodies, the terminology "thin-walled cylinder" must be redefined for aniso tropic materials, and is a strong function of elastic moduli. This places a severe burden on the experimentalist who must employ such specimens to characterize composite materials under biaxial states of stress. In this work, a procedure is outlined to determine the proper geometry of anisotropic and laminated cylinders such that elastic stress gradients can be reduced to a predetermined limit. The ap proach consists of combining a modified plane strain elasticity solu tion with shell theory. Parametric studies on materials possessing high and low degrees of anisotropy indicate general guidelines for proper tube geometry for precise characterization under simulated laboratory loading and clamping conditions.

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