| Autor: |
Rajaiah, K., Kumar, R.Ramesh |
| Zdroj: |
International Journal of Solids and Structures; January 1985, Vol. 21 Issue: 2 p177-185, 9p |
| Abstrakt: |
This paper presents optimized hole shapes in circular cylindrical shells under torsion for a range of values of β, the curvature parameter. The hole shapes are optimized considering only the predominantly large membrane stresses around the holes, with the use of two-dimensional photoelastic method and a special polariscopc arrangement and the removal of material from low stress regions around the hole in a systematic way. The membrane stress distributions around circular, square (with one of its diagonals along the axis of the shell) and optimized holes are obtained. The membrane stress concentration factor for the optimized holes decreased by as much as 23% and 33% when compared to circular and square holes respectively, while the area covered by the optimized hole increased by as much as 41% when compared to the circular hole. Coefficient of efficiency of about 0.90 is achieved for optimized holes. The geometries of the optimized holes are presented in a form suitable for use by designers. Studies on square holes show that, while the s.c.f. for square hole is less than the s.c.f. for the corresponding circular hole for β< 0.75, the opposite is true for β> 0.75. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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