| 摘要 |
The invention concerns a threaded tubular element whereof the thread comprises at least a tangential connecting zone with multiple radii (21) at the thread root, in particular on the bearing flank (13). Said zone (21) comprises a main arc (23) of radius (rP1) whereof the circle intersects the flank (13) in one point (PRF1). The tangent in (PRF1) to said circle forms a strictly positive angle (D) with the flank (13). The secondary arcs (25, 27) of radii (rS1, and rT1) less than (rP1) provide the tangential connection of the main circle on the side of the flank (13), on the other side of the thread root (19). The radius (rP1) is greater than that (rH1) of the standard circle (29) which passes through (PRF1) and which would constitute alone a tangential connection zone. Such a threaded element provides a tubular threaded joint wherein it is integrated with good resistance to static as well as cyclic loads.
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