Quote:
Originally Posted by MPREZIV
I've got to question his "never been curbed" as well, as that seems like an odd failure if everything's installed and maintained as it should be...
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Weld heat affected zones and thread grooves can be pretty large stress risers. Now I'm not a failure analysis/fracture mechanics expert by any means, just a regular ole' mechanical engineer, but IMO that tubing just visually looks fairly thin to handle both. I think it would have to be some pretty high yield alloy to have been properly designed to handle the loads seen on track with sticky tires.
Fatigue is a funny thing... a part that passes high static or even dynamic stress tests a few times can fail eventually when subjected to a much lower load applied repeatedly for X number of cycles.