Footpeg bolt failed while riding
js at strappe.com
Sun Aug 26 11:35:03 PDT 2007
Wade Bartlett wrote:
> I disagree. The fracture face shows absolutely no metallurgical problems
> (granted something might turn up with an SEM or even a decent optical
> microscope, but given the photo we have to work with now, there's
> nothing visible). Multiple minor fractures around the periphery suggest
> an initial overtorque, the beach marks" across the face indicate that
> the overtorque was followed by fatigue, which progressed in a modest
> number of steps (I can count at least 18 fracture progressions in that
> photo). The final fracture was at the angled part near the top of the
> fracture photo.
Wade - can you expand on your comments? I guess I see the fracture progressions
at the thread root. How about the almost horizontal striations through the core
of the bolt?
Any further clues that appear to the experienced eye?
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