This study dealt with the tensile strength and fracture mechanism of quasi-isotropic carbon/epoxy laminates with different stacking sequence. The stacking sequences employed in this study were [0/±45/90]
s, [0/+45/90/-45]
s, [0/90/±45]
s, [±45/0/90]
s, [±45/90/0]
s, [90/0/±45]
s and [90/±45/0]
s. The maximum load of each quasi-isotropic laminate showed a higher value than that of [0
2] laminate.
Splitting failure in 0° layer, shear fracture in 45° layer and delamination initiated from the cracks in 90° layer were dominant fracture patterns in quasi-isotropic carbon/epoxy laminates, and their control was important to improve the laminate strength. Especially the suppression of the splitting failure in 0° layer was most important for the improvement of laminate strength because the load bearing capacity of 0° layer was the highest among all layers. The laminates with 0° layer placed at the inner layer showed higher strength because the splitting failure in 0° layer was suppressed sufficiently. The shear fracture in 45° layer initiated from the cracks in 90° layer also affected the laminate strength. The [90/±45/0]
s laminate showed the highest strength among the laminates employed in this study, since the suppression of the fracture in 0° layer and of the fracture progress from the cracks in 90° layer is realized well. From the viewpoint of the suppression of fracture, it was verified that the application of interleaf was effective for the improvement of laminate strength of quasi-isotropic carbon/epoxy laminates.
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