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Torque Test On Extension - Torque Load Depending of the Length???

Torque Test On Extension - Torque Load Depending of the Length???

Torque Test On Extension - Torque Load Depending of the Length???

(OP)
Hello,

I made some torque test to failure to some extension. These extension are made of 4037 steel and heat treated.
At a 47-51 HRc, these extensions brake at a good load level. But I have a problem with the failure mode:
- the 1.5" long breaks ductile,
- the 3" long breaks ductile,
- the 6" long breaks semi-ductile,
- the 10" long breaks brittel.
WHY? Is the lenght of the extension a factor of a part breaking ductile or brittel? If yes, why?
Note: The extension I am testing have a special shape on the male square. They have all (1.5", 3", 6" and 10") the same shape with a low section at the end of the shank, before starting the male square. But this section is the exact same for all sizes.
Thanks for any help.

RE: Torque Test On Extension - Torque Load Depending of the Length???

My guess would be that with the longer parts the angle of twist was higher and the failure cause was shear not bending while the shorter parts failing in bending.

RE: Torque Test On Extension - Torque Load Depending of the Length???

Is the torsional movement to failure the same for all?  Say in degrees of wrap/inch of length?  How about recording load/wrap?
I'll bet not.  The longer ones are not staying straight as they are torqued and they are failing in a different loading mode.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm

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