stepped shaft stress concentration
stepped shaft stress concentration
(OP)
we are using a stepped shaft and i found in all machine design books, to avoid the
stress concentration in the change in diameter we have to provide a fillet radius
to avoid stress concentration.
why can't we taper the change in diamater of shaft for a slope 1:4 so that,
there will not be a abrupt change in cross section and
stress concentration is also reduced?
please clarify
stress concentration in the change in diameter we have to provide a fillet radius
to avoid stress concentration.
why can't we taper the change in diamater of shaft for a slope 1:4 so that,
there will not be a abrupt change in cross section and
stress concentration is also reduced?
please clarify





RE: stepped shaft stress concentration
You can taper the shaft if you wish but if the difference in diameters is large then you will need a long taper, also depending on what's mounted on the shaft,a taper might not be practical due to space available.
RE: stepped shaft stress concentration
Quando Omni Flunkus Moritati
RE: stepped shaft stress concentration
RE: stepped shaft stress concentration
I suggest you FEA a shaft with and without such a feature as an educational experience to the suggestion.
Good luck with it.
Regards,
Cockroach
RE: stepped shaft stress concentration
Some regions of some shafts are so lightly stressed that steps, sharp corners and torn surface finish won't reduce fatigue life a bit. So nice finishes and transitions can only be justified under workmanship.
RE: stepped shaft stress concentration