Abstract
Composite laminates with a damage hole,whose strength will reduce by about 55% under tensile loads,need to be repaired in order to recover their mechanical properties and meet the usage requirements. Mechanically fastened repair projects of composite laminates with a circular hole were designed and the repair effects were evaluated by tensile tests. Finite element models were established according to test condition,from which the effects of different repair projects on the failure loads,failure modes,stress distributions,and bolt load distributions were analyzed. The results of tests and finite element analysis( FEA) show that the recovery rate of failure strength of bolted repaired laminates will reach about 55%- 60%. The areas beside the outermost bolt holes in the repair area of the laminates mainly produce stress concentration. The final failure mode of the laminates is breaking along the outermost bolt holes in the repair area. Methods such as double patch repair,adding fastened bolts,using a metal patch and increasing the thickness of patch properly can reduce stress concentration,improve bolt load distributions and enhance the recovery rate of structural failure strength.
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