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1045 spline stress cracks

thread723-108511

1045 spline stress cracks

1045 spline stress cracks

(OP)
I make splines for a Harley Trike shop. 4 recent failures (clean straight break) at a c-clip groove I believe due to stress cracks and vibration. I propose adding more radius to the groove, but wonder if a different grade of steel will help too. Currently using 1045 CF. Any suggestions? 1050 pros and cons?

RE: 1045 spline stress cracks

What is the hardness of the 1045 you are using?

How is the groove and spline machined?

Bead blasted?

Yes C-clip grooves and splines are stress concentrators and will generally initiate shaft failures. Bigger radii might help.

Nick
I love materials science!

RE: 1045 spline stress cracks

1050 is not the right answer - it has more carbon, so it will be more susceptible to cracking.  What are the part requirements?  Perhaps a lower carbon alloy steel will be better.

Regards,

Cory

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