Tension and compression tests of quasi-isotropic [0/ ± 45/90]2s, graphite/epoxy lami nates containing a circular hole with reinforcement were conducted. Two types of rein forcement were investigated; adhesively bonded plug reinforcement or snug-fit unbonded plug in the hole. For each case of reinforcement, four different sizes of hole diameter and three types of reinforcing material (aluminum, plexiglass, steel) were employed for in vestigation. The experiments were mainly focused on the evaluation of ultimate strength of laminate with reinforced hole in comparison to its counterpart with the open hole.
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