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From the last quarter of the twentieth century composite materials have gained immense importance in various applications where weight saving is a premium. Of late, non conventional cross section pipes made of composites have been started to be used in aerospace, automobile industry, shipbuilding, oil and gas transport industry, municipal sewage application and many more, where lateral space is a constraint. Though such pipes being reported to be advantageous, stress analysis of them requires involvement of rigorous computational tool like the FEM. In this paper an effort has been made to perform stress analysis of such pipes using ANSYS. Firstly two benchmark problems on layered composites have been analyzed and the results are matched with the analytical solutions. Then three different sections i.e. circular, triangular and rectangular pipes of isotropic materials with same perimeter, thickness, load and boundary conditions have been analyzed to compare the maximum hoop stress. The same analyses were then repeated for orthotropic materials to estimate maximum hoop stress for different fillet radii. Variation of maximum hoop stress has also been estimated by changing fiber orientation angle for all the above mentioned three sections. Trends of results matched well with those reported in the literature. With this knowledge base at hand three different sections (circular, triangular and rectangular) have been analyzed under both internal pressure and transverse loading. For a given constant perimeter four different sections of elliptical pipes have been analyzed by changing aspect ratio under both internal pressure and transverse loading to determine the optimum cross section. Lastly, stress analyses have also been carried out on egg section pipes that are being used nowadays commercially for sewer applications. These analyses have been done for different aspect ratios to determine the optimum cross section for a constant lateral space. Effect of fiber orientation angle has also been analyzed. Acoustic studies of these optimum cross section of egg shaped pipes can also be done in future.
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