| 摘要 |
A joint assembly including work pieces with aligned holes of a prescribed diameter therethrough, a fastener in the holes and having a shank portion a prescribed amount less in diameter than the holes, and a metal sleeve member positioned between the shank portion of the fastener and the work pieces within the holes and in bearing contact with both the shank portion and the work pieces. The sleeve member includes a tubular side wall encircling the shank and substantially filling the space between the shank and the work pieces. The thickness of the tubular wall is nominally 0.008 or 0.016 inch. The metal sleeve member should preferably be made of a material similar in strength to that of the work pieces. For the high strength requirements of the aerospace industry the metal sleeve member should have a Brinell Hardness Number of at least 60 and/or a yield strength in excess of 20,000 p.s.i. The sleeve member may also be provided with a outwardly extending head flange at one end thereof and the tubular wall may be circumferentially grooved at longitudinally spaced intervals to allow the length of the wall to be adjusted by removal of excess material and to provide sealant reservoirs along the length of the tubular wall adjacent the work pieces about the aligned holes. The distal end of the tubular side wall may be tapered inwardly to provide a self-centering capability as the sleeve member is inserted into the holes, especially in interference.
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