炭素繊維強化積層複合材の細径ピンによる穿孔と細径ボルトの密集配置による接合

概要

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In this paper, a mechanical joint that consists of densely arranged thin bolts is proposed for joining CFRP laminates. Tiny bolts have only low load transfer capacity, but their dense assemblage can provide the same total load transfer capability as a smaller number of large bolts. Bolt holes are opened by piercing sharp pointed pins in a B-stage prepreg and the inserted pins are replaced with release coated tubes, which are kept inserted during the prepreg cure. At the completion of cure, removing the tubes, smooth bolt holes are formed in the CFRP laminate. Ultrasonic vibration assisted pin insertion test was also conducted, leading to a drastic reduction of the required insertion force, but it did not reduce the fiber breakage in the pierced hole. An experimental study was also done to explore the effects of the bolt size and the hole forming method i.e., drilling and piercing, on the joint strength. Finally, a series of tensile shear tests of the proposed joints under both quasi-static and low-cycle fatigue loading conditions was carried out to investigate their possibility and feasibility.