Posted by bjb in Tx from Ne on July 25, 2018 at 05:08:47 from (147.1.235.122):
In Reply to: Re: My experiment... posted by showcrop on July 24, 2018 at 15:10:36:
In general the loads and stresses for the blade would be greatest near the pivot point.
The radial load exists as an almost linear decreasing function (assuming a uniform cross section of the blade) where the max load would be near the pivot point, approximately half that load level would be a the mid point, and the load at the tip would be zero.
Note, all these discussions about loading is qualitative in nature, b/c the base assumption for discussion is a nice straight blade with uniform cross section (which makes it easier to picture the general fatigue and loading aspects), the actual stress at any one location could increase or decrease based on any taper in the blade, bends in the blade, and the varying depth of the serrations.
Finally, notice I try and state the load is largest "near" the pivot pin. If this pin is tight (or binds), and there is friction between the blade and the housing disc, that will help transfer some of the load before the pivot pin, which reduces the stress on the pin and in the blade at the pin location.
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