ANALYSIS OF STRESSES AROUND ELLIPTICAL CUTOUTS AND INCLUSIONS IN LAMINATED COMPOSITE CYLINDRICAL SHELLS
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Abstract
In thin shell structures, like pressure vessels, high pressure ducts and aircraft fuselages, openings are invariably necessary. Circular openings in structural members are generally preferred in practice due to its simple geometry; but, from a purely structural point of view, there are other configurations which offer certain specific advantage over the circular shape. The most important among these is the elliptical configuration. Elliptic configuration is used for window openings in aircraft fuselages andis recommended for manholes by the ASME Code for Unfired Pressure Vessels and the British Standard Specification (BS 1500) for Fusion Welded Pressure Vessels.Multilayered composite materials are being increasingly used in the construction of such structures. This has created the need of analysis of elliptical cutouts in composite laminated cylindrical shells. Also in certain cases the elliptical opening is closed by elastic inclusions as in case of transparent windows in pressurized cabins like aircraft fuselage and for radiation of heat in environmental chambers.
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