how to calculate shear area on taper thread?
how to calculate shear area on taper thread?
(OP)
Dear folks,
anyone knows how to calculate shear area on taper thread? i'm trying to calculate shear capacity for taper thread.
so far i've only seen shear area determination for straight thread, not taper.
any idea?
thank in advance
yudhi
anyone knows how to calculate shear area on taper thread? i'm trying to calculate shear capacity for taper thread.
so far i've only seen shear area determination for straight thread, not taper.
any idea?
thank in advance
yudhi





RE: how to calculate shear area on taper thread?
more realistic ... figure out where the first thread into the nut is, use this area
Quando Omni Flunkus Moritati
RE: how to calculate shear area on taper thread?
If so, one issue with tapered pipe threads is that since they are tightened to an interference fit the total engaged thread length can vary a bit from one joint to another. Also, due to how the tapered threads are produced, the threads in any given connection may not be equally loaded along the engaged length.
The taper angle in NPT threadforms is just 1:16 per side. So the variation in thread pitch diameter along the engaged thread helical length should not have too significant an effect with a simple shear area calculation.
RE: how to calculate shear area on taper thread?
i had some thinking like what rb1957 says for conservative to 'use minimum area'.
but if i calculate it in that way, means that i disregard the advantage of taper thread
(i'm not study it in detail, but i believe taper thread is one of the attempt to improve thread joint connection).
i'm looking for some sample how people determine shear capacity of taper thread (by hand calculation, if possible).
anyway, thanx for reply.
RE: how to calculate shear area on taper thread?
I have not seen an example where a tapered screw thread provided better axial load capacity. But I have seen where the threads in a tapped hole were created with a continuously variable pitch to equalize the stresses in the threaded connection.
RE: how to calculate shear area on taper thread?
Ted
RE: how to calculate shear area on taper thread?
Ted
RE: how to calculate shear area on taper thread?
It also depends on how detailed you want to get. The first few threads will carry most of the load unless you allow for plastic deformation to spread the load.