Table 4: Summary of numerical analysis for cylindrical shells including an elliptical cutout with constant width and different height.

Model designation Shell length Cutout size () Buckling load () R400-θ90-L300-L0150-α70-Perfect 300 — 2535 R400-θ90-L300-L0150-α70- 300 1397 R400-θ90-L300-L0150-α70- 300 1314 R400-θ90-L300-L0150-α70- 300 1201 R400-θ90-L300-L0150-α70- 300 1094 R400-θ90-L300-L0150-α70- 300 1000 R400-θ90-L500-L0150-α70-Perfect 500 — 2103 R400-θ90-L500-L0150-α70- 500 1224 R400-θ90-L500-L0150-α70- 500 1139 R400-θ90-L500-L0150-α70- 500 1030 R400-θ90-L500-L0150-α70- 500 930 R400-θ90-L500-L0150-α70- 500 847 R400-θ90-L700-L0150-α70-Perfect 700 — 2004 R400-θ90-L700-L0150-α70- 700 1170 R400-θ90-L700-L0150-α70- 700 1064 R400-θ90-L700-L0150-α70- 700 960 R400-θ90-L700-L0150-α70- 700 860 R400-θ90-L700-L0150-α70- 700 750 R1000-θ90-L300-L0150-α70-Perfect 300 — 3489 R1000-θ90-L300-L0150-α70- 300 2366 R1000-θ90-L300-L0150-α70- 300 2300 R1000-θ90-L300-L0150-α70- 300 2216 R1000-θ90-L300-L0150-α70- 300 2125 R1000-θ90-L300-L0150-α70- 300 2014 R1000-θ90-L500-L0150-α70-Perfect 500 — 2371 R1000-θ90-L500-L0150-α70- 500 1900 R1000-θ90-L500-L0150-α70- 500 1829 R1000-θ90-L500-L0150-α70- 500 1730 R1000-θ90-L500-L0150-α70- 500 1640 R1000-θ90-L500-L0150-α70- 500 1520 R1000-θ90-L700-L0150-α70-Perfect 700 — 2104 R1000-θ90-L700-L0150-α70- 700 1720 R1000-θ90-L700-L0150-α70- 700 1610 R1000-θ90-L700-L0150-α70- 700 1520 R1000-θ90-L700-L0150-α70- 700 1420 R1000-θ90-L700-L0150-α70- 700 1300