Arrangement for clipping stress peaks in a turbine blade root
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United States of America Patent
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Oct 22, 1996
Grant Date -
N/A
app pub date -
Sep 22, 1995
filing date -
Sep 30, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
An arrangement for clipping stress peaks in the anchoring of a turbine blade including a root that is shaped like a Christmas tree, that includes tangs, and that is received in a correspondingly-shaped groove in a disk so as to anchor the blade thereto, wherein the outline of each tang, on the extrados side of the blade root, is such that the clearance for mounting the root in its groove, on the extrados side, is not uniform but rather it includes at least one zone in which the clearance varies, the zone corresponding to a zone of the tang in question where, if the disk-and-blade assembly were rotating at its rated speed of rotation, there would otherwise occur a stress peak relative to the mean stress along the tang if the blade were mounted with constant clearance along the entire length of the tang, the varying clearance varying along the at least one zone with the same sign as the stress peak.
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