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Table 2 Buckling loads for different lay-up sequences with and without imperfection

From: The effect of different geometrical imperfection of buckling of composite cylindrical shells subjected to axial loading

Lay-up sequence P cr(kN)
Without imperfection With imperfection
(45,−45,45,−45)S 102.563 68.834
(902,45,−45)S 179.235 119.490
(02,45,−45)S 128.620 85.746
(02,30,−30)S 127.135 84.195
(02,60,−60)S 144.294 96.841
(454,−454) 70.537 58.779
(0,45,−45,0)S 166.401 110.087
(90,0)2S 122.655 83.438