Abstract
In our previous experiments, the tensile net fracture stress of double-edge-notched carbon-carbon composite (C/C) specimens has been in some cases much higher than that of smooth specimens. To optimally utilize this phenomenon, the tensile fracture behaviour of multi-holed C/Cs with cross-ply lamination was examined. Multi-holed specimens with different numbers of holes and different distances between the holes were prepared and tensile fracture tests were conducted. FEM calculations were performed in order to study the stress distributions during the tensile tests. Higher tensile strength than that of smooth specimens was obtained in an optimal case on the basis of averaged net stress. The strength dependency on the specimen geometry could be explained mainly by the load sharing effect among the ligaments.
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