can a very high torque results in bending of a shaft?
can a very high torque results in bending of a shaft?
(OP)
hi everyone
in our plant(wide plate mill)we have a leveling machine to flat the steel plates that have small waves.it has 11 rolls,5in a top cassette and 6 in bottom that are connected to the drive system-electromotor,gear unit&pinion- via 11 cardan shaft spindles.cardan shafts are equipped with safety couplings to protect them from high torque.recently due to mis-operation of the machine a very high torque exerted to cardan spindles causing plastic torsion and bending in 3 spindles.the question is that when we have only pure torsion(no bending or axial force)in the spindles,why they are bended?in other words ,can a very high torque results in bending of a shaft?
in our plant(wide plate mill)we have a leveling machine to flat the steel plates that have small waves.it has 11 rolls,5in a top cassette and 6 in bottom that are connected to the drive system-electromotor,gear unit&pinion- via 11 cardan shaft spindles.cardan shafts are equipped with safety couplings to protect them from high torque.recently due to mis-operation of the machine a very high torque exerted to cardan spindles causing plastic torsion and bending in 3 spindles.the question is that when we have only pure torsion(no bending or axial force)in the spindles,why they are bended?in other words ,can a very high torque results in bending of a shaft?





RE: can a very high torque results in bending of a shaft?
If the cardan shafts are hollow, then the high torsion that was placed on them could have caused them to buckle, on this link is a shaft that as failed by torsional buckling.
http
Can you post any pictures of your failed shafts
desertfox
RE: can a very high torque results in bending of a shaft?
RE: can a very high torque results in bending of a shaft?
While I have seen this happen - it usually seems some gear or motor breaks first - but not necessarily!!
RE: can a very high torque results in bending of a shaft?
RE: can a very high torque results in bending of a shaft?
Yes our cardan shafts are hollow(dia.170 x tick.12mm)but i think buckling take place in compression members or where there is compressing force .The picture in the link you addressed,f-18
engine shaft,it seems that the shaft is only twisted,because in bucking members there is some deflection perpendicular to axis of member.
Thank you brianE22
The 2 shaft on either side of our joint shaft are horizontal and parallel.you can find attached photo and drawing of joint shaft.
Tank you "MiketheEngineer" and "dvd" for your sympathy.
RE: can a very high torque results in bending of a shaft?
M = torque x sine (4.6 degrees)
There may be a joint angle on the shaft in the other plane also. I couldn't quite figure out some of the views.
RE: can a very high torque results in bending of a shaft?
you can find the exact equation of motion of cardan joint in Wikipedia :
http://en.wikipedia.org/wiki/Universal_joint
The 4.6 degree you mentioned, is inclination angle (beta)of joint shaft.as you can see in the equation of motion , the lower the angle"beta",the variable effect of rotation speed and moment is lower.
RE: can a very high torque results in bending of a shaft?
Look at this article it describes bending moments due to misalignments in the joints:-
http:/
desertfox