NASA Technical Reports Server (NTRS) : Bending pdf

NASA Technical Reports Server (NTRS) : Bending

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Description of the Book:

An analytical, parametric study of the attenuation of bending boundary layers or edge effects in balanced and unbalanced, symmetrically and unsymmetrically laminated thin cylindrical shells is presented for nine contemporary material systems. The analysis is based on the linear Sanders-Koiter shell equations and specializations to the Love-Kirchhoff shell equations and Donnell’s equations are included. Two nondimensional parameters are identified that characterize and quantify the effects of laminate orthotropy and laminate anisotropy on the bending boundary-layer decay length in a very general and encompassing manner. A substantial number of structural design technology results are presented for a wide range of laminated-composite cylinders. For all the laminate constructions considered, the results show that the differences between results that were obtained with the Sanders-Koiter shell equations, the Love-Kirchhoff shell equations, and Donnell’s equations are negligible. The results also show that the effect of anisotropy in the form of coupling between pure bending and twisting has a negligible effect on the size of the bending boundary-layer decay length of the balanced, symmetrically laminated cylinders considered.

Moreover, the results show that coupling between the various types of shell anisotropies has a negligible effect on the calculation of the bending boundary-layer decay length in most cases. The results also show that in some cases neglecting the shell anisotropy results in underestimating the bending boundary-layer decay length and in other cases it results in an overestimation

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 1/1/2000
• Year: 2000
• Book Topics/Themes: NASA Technical Reports Server (NTRS), BENDING, BOUNDARY LAYERS, LAMINATES, ANISOTROPY, CYLINDRICAL SHELLS, ELASTIC SHELLS, ANISOTROPIC SHELLS, ORTHOTROPIC SHELLS, ORTHOTROPIC CYLINDERS, STRUCTURAL DESIGN, DIFFERENTIAL EQUATIONS, Nemeth, Michael P., Smeltzer, Stanley S., III

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