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An experimental investigation of AS4/2220-3 graphite epoxy woven fabric composite bolted joints

机译：as4 / 2220-3石墨环氧织物复合材料螺栓连接的试验研究

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The influence of design parameters on the strength and failure mode behavior of bolted joints in AS4/2220-3 plain weave fabric graphite epoxy laminates has been investigated. The effects of fastener size, laminate thickness, fastener half spacing and fastener torque were experimentally characterized for two stacking sequence configurations of quasi-isotropic laminates. Qualitative characterization of failure mechanisms and joint strength was performed for laminates configured with varying percentages of angle plies. The experimental data was used to assess the effectiveness of a composite bolted joint strength model based on the application of a quadratic interaction failure criterion on a 'critical distance' plane around the loaded portion of the hole. The strength model was found to work when properly calibrated to data for the material system and range of geometric parameters considered. Evidence suggested that the strength model should not be applied generally without proper calibration in the range of geometry of interest.

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