Abstract
In this study, factors affecting the strength and fatigue life of multiple-row bolted composite laminates are ranked in order of importance using linear regression analysis. Eight different factors related to the hole quality, geometry, material properties, laminate configuration, fastener type, and environmental conditions were included. Fourteen different specimen configurations were tested according to a design of experiments test-matrix. The results show that, of the investigated factors, the most significant are the ratio of bolt diameter to specimen width, bolt type (flush- or protruding head), and ratio of hole diameter to laminate thickness. During fatigue loading (constant amplitude), specimen deflections were measured at maximum and minimum loads. Only small changes in deflection (less than 0.05 mm) were detected up to approximately 90% of the fatigue life. The deflections increased rapidly after that point.
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