torque tensioning
torque tensioning
(OP)
does anyone know how to convert a torque to a axial tension force.
I am looking for tables where you can specify the amount of torque require to tension a rod.
Does anyone have any tips
I am looking for tables where you can specify the amount of torque require to tension a rod.
Does anyone have any tips





RE: torque tensioning
t29u.pdf
in MARYLAND METRICS site
http://www.mdmetric.com
Torque issues maybe are actually dealt with in items 275 and following in the following site
http://www.mdmetric.com/home3.htm#tech
RE: torque tensioning
This formula is a good approximation :-
F= T/(0.2*d)
F= axial force
T= torque
d= nominal diameter of bolt
0.2 is the coefficient of friction.
regards
desertfox
RE: torque tensioning
I suggest you use the turn of the nut method suggested in the AISC code. Another option is to use load indicator washers.
DO NOT correlate torque to tension unless you have gone through a calibration process first.
RE: torque tensioning
We had a roll out section for a tunnel (about 3.2 m diameter) that had 3 rows (50 each) of 50 mm dia bolts. The specification was for the bolts to be clean & lightly oiled & then tightened up to (in those days) 3,800 lb ft torque. Tensioned to 50 %, 80 %, 100 % & then 100 % again to a pattern (of course). The problem was that the bolts were tightened up after they were lubricated with petrolatum paste (it appears that they did not have any oil handy). Most bolts 'necked' & had to be replaced.
As BryanStein said 'DO NOT correlate torque to tension unless you have gone through a calibration process first.'
Regards
Barrya