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Discussion Starter · #1 ·
hey can either of you guys shoot me a private measage - trying to see how things are going with the d-44 joints ? anyone heard?

[ 09-23-2001: Message edited by: onetoncv ]
 

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Originally posted by onetoncv:
<STRONG>hey can either of you guys shoot me a private measage - trying to see how things are going with the d-44 joints ? anyone heard?

[ 09-23-2001: Message edited by: onetoncv ]

</STRONG>
well i think it may need some more development. <IMG SRC="smilies/biggrin.gif" border="0"> kelly broke it on stage 7. she was "getting it" on a very hard section and broke the cross.
 

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Discussion Starter · #3 ·
did she break anything else or just the joint - are you shure it was the joint we were tring out camo? he only had one - go any pics? thanks for the news- Jess

[ 09-23-2001: Message edited by: onetoncv ]
 

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Discussion Starter · #4 ·
was it in johns rig? i thought we were going to try our new joint in lances cruzer? did you have time to change an axle and install it on johns toy? thanks for the info- Jess
 

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Originally posted by onetoncv:
<STRONG>are you shure it was the joint we were tring out camo? </STRONG>
<IMG width=640 height=480 SRC="http://www.pirate4x4.com/ubb/uploads/pretty_sure.jpg">

Pretty sure. <IMG SRC="smilies/thefinger.gif" border="0">
 

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Discussion Starter · #7 ·
there's it is- broke as hell- thanks camo for the pic's - those joints suck- time for round 2 -Jess
 

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Originally posted by onetoncv:
<STRONG>was it in johns rig? i thought we were going to try our new joint in lances cruzer? did you have time to change an axle and install it on johns toy? thanks for the info- Jess</STRONG>
yes it was in kellys rig. the all-pro truck has a hybred 60 in it.

what material was that made out of?
 

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Originally posted by onetoncv:
<STRONG>there's it is- broke as hell- thanks camo for the pic's - those joints suck- time for round 2 -Jess</STRONG>
LOL indeed. <IMG SRC="smilies/biggrin.gif" border="0">
 

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Discussion Starter · #10 ·
4340 moly- not the (shit) as far as i can see- did anything else break camo? back to the drawing board- glad i did not sink 1,000s of dollars until i knew for sure-
 

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ripped the ears off the inner axle because they had to drive the rest of stage 7 to get off the course.

maybe try 300m on your next one.
 

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Sorry to see the break but from a guy just out to build a trail rig it sure is nice to see a developer checking on his/her own product!!!!
<IMG SRC="smilies/usa.gif" border="0"> <IMG SRC="smilies/beer.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0">
 

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That sucks they was such a pretty u-joint. Well back to the drawing board. Will try to think of something else to use in there. After you take a look at it Jesse would you please send it to me so I can look at it. How much abuse did it take before it broke? Was it better than the Spicer Joint?
 

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Discussion Starter · #14 ·
my exact sediments donovan - hope to get it back to see and maybe metal test it- hope lance does not throw it at me- Jess
 

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Hmmm... possibly a victim of stress concentration? Looks like there was a sharp transition between the bearing surface and the cross. The affect of that transition radius on the local stress is called the "Stress Concentration Factor" and it can be dramatic. Just thinkin' the material selection might be fine and it's the design that's gettin' ya.
 

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I was thinking the same thing loooking at it. Maybe you want to try something with a little less of a stress riser there. Can one be made that necks down to the bearing surface? or maybe round the interface a little bit. Might end up being quite a bit stronger.

Haven't looked at my enginerding books in a while, but seems to me that the sharp corners should be avoided in something like that.

=John
 

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Originally posted by RoverOver:
<STRONG>enginerding</STRONG>
LOL <IMG SRC="smilies/thefinger.gif" border="0">

A brittle material is especially susceptible to stress concentration. Check out MP35N, that stuff kicks ass (still gotta reduce the stress concentration though).

BTW, here's a great place to get material properties: http://www.matweb.com

Offer a free d-shaft to one of the enginerds on here in exchange for some FEA analysis. If I wasn't so rusty at it I'd help ya <IMG SRC="smilies/frown.gif" border="0">

[ 09-23-2001: Message edited by: Eric Ruhl ]
 

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MP is great except for machining and galling. Since he got rid of the needle bearings galling would be a problem. If it was a fatigue failure MP or another cobalt-chrome alloy would be the way to go, but from the picture it looks like it was not or at least the fast fracture region was very large. I think he mentioned it was heat treated to 280 KSI. In that case 4340 would be kinda brittle and the stress concentration factors others mentioned would be significant.
 

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Well I will tell you guys the joints was heat treated to 50 Rc and I had .060 raduis in the corner of them. They was built just like a stock Neapco U-joint. I think that maybe we should put in a larger raduis in the corner like .120" or change material and put the larger raduis in there. We had to start somewhere.
 
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