I seriously doubt that bead blasting will make any difference at all.
Shot peening is effective because of 2 effects
a) pounding of the exterior of the rods leads to a shallow layer of compressed
material, this residual compressive stress reduces the growth rate of cracks
since fatigue cracks will grow under tensile loads (and a pre-load of
compression
reduces the peak tensile load)
b) this compressed layer has less sharp corners, ridges, machining marks and
other stress concentrators than the part would otherwise have.
The glass beads are nowhere near hard enough (or have enough momentum anyhow)
to plastically deform the rods material, so you'd be wasting your time (though
thinking of pretty girls is hard to call unproductive :-)
Mike
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