Stress Gradients in Laminated Composite Cylinders
In a recent paper , (see also ) it was shown that extremely severe stress gradients can exist in the wall of a unidirectional, helical-wound cylinder under the common loadings applied in the laboratory, i.e., axial loading, internal pressurization, and torsion. In that study it was found that the stress gradients were drastically reduced in an orthotropic, symmetric laminated cylinder, such as an angle-ply. In fact, for the case of torsion, the shear stress distribution almost coincides with that which occurs in an isotropic cylinder. While an analogous smoothing of the stress field occurs under other loadings, the axial normal stress under axial loading and the hoop stress under internal pressure are somewhat different from the respective isotropic results. For example, refer to Figure 12 in . In order to complete the treatment of the geometric design of tubular characterization specimens, the remaining stress components, e.g., the hoop and shear stresses induced in the axial loading experiment, should be considered. It is therefore the purpose of this note to present some results in this regard for laminated cylinders.
KeywordsStress Gradient Hoop Stress Shear Stress Distribution Lamination Theory Axial Normal Stress
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- 3.Y. Staysky, “Bending and Stretching of Laminated Aeolotropic Plates,” Proc. Am. Soc. Civil Engrs.; J. Engr. Mech. Div., Vol. 87 (1961), p. 31.Google Scholar