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Calculate tension in torqued bolt 6
- Thread starter patelam
- Start date
GBTorpenhow
Mechanical
Heres a starting point:
- Thread starter
- #3
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1
- #5
TugboatEng
Marine/Ocean
Except that stainless steel may have wildly different coefficients of friction due to galling. If you need to have an accurate tension with stainless steel I suggest using torque to yield or torque to angle depending on the rigidity and variability of the joint.
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LittleInch
Petroleum
Patelam,
You can only get a range of numbers which by the look of the link is a factor of 3. That sounds about right.
Torque to tension is dependent on a number of factors which are difficult to control or determine. If you want definitive tension then use a hydraulic bolt tensioner.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
You can only get a range of numbers which by the look of the link is a factor of 3. That sounds about right.
Torque to tension is dependent on a number of factors which are difficult to control or determine. If you want definitive tension then use a hydraulic bolt tensioner.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
K-factor is key to your answer; Without knowing it, you're guessing numbers, and will only find a range like LI mentioned. Practice is you'll only find it by testing, and it only applies when the variables affecting K-0factor, dont change
Huub
- You never get what you expect, you only get what you inspect.
Huub
- You never get what you expect, you only get what you inspect.
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- #8
LittleInch
Petroleum
XL83NL said:
And that's about as rare as rocking horse shit....
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
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- #9
Attached is some info about the threshold galling stress of various SS combinations in contact and sliding.
From a mere 2ksi to over 50 ksi.
For a cranky combo of SS fasteners, material hardness and smoothness of the threads can only do so much.
I don't remember the materials, but a precision spindle company made some SS spindles for a centrifuge or something. We routinely made gorgeous precisely ground threads in many ferrous materials.
Basically as soon as there was ANY load on the locknut when beginning to tighten against the bearing preload, the nut seized HARD to the spindle threads.
The nut simply had to be cut for removal.
From a mere 2ksi to over 50 ksi.
For a cranky combo of SS fasteners, material hardness and smoothness of the threads can only do so much.
I don't remember the materials, but a precision spindle company made some SS spindles for a centrifuge or something. We routinely made gorgeous precisely ground threads in many ferrous materials.
Basically as soon as there was ANY load on the locknut when beginning to tighten against the bearing preload, the nut seized HARD to the spindle threads.
The nut simply had to be cut for removal.
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- #11
A nice reference, Tmoose - here is a link to the publication which that appears in -
REVIEW OF WEAR AND GALLING CHARACTERISTICS OF STAINLESS STEEL
REVIEW OF WEAR AND GALLING CHARACTERISTICS OF STAINLESS STEEL
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