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Cool, thanks for the tip. I may do that!
Driveshaft busted
- Thread starter moribundman
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JHZR2
Staff member
It looks like there were not enough grain boundaries to provide adequate tenacious strength of the metal under the right loading scenario. Just seems to me that the metal looks different between the outer (corroded) ring and the inner sheared area. Wouldnt know this without microscopy or preferably SEM.
Could have been because of a growing crack and resultant corrosion, could have been because of a bit of excessive porosity in that area, etc. This may have been from any variety of reasons, loading and unloading, etc.
A weakness like this will let go sooner or later. Nothing you can do about it. If it was corrosion facilitated, perhaps you can spray your replacement with some urethane or lacquer or something in the non-oiled areas, to make a more tortuous path, effectively limiting diffusion of oxidant.
JMH
Could have been because of a growing crack and resultant corrosion, could have been because of a bit of excessive porosity in that area, etc. This may have been from any variety of reasons, loading and unloading, etc.
A weakness like this will let go sooner or later. Nothing you can do about it. If it was corrosion facilitated, perhaps you can spray your replacement with some urethane or lacquer or something in the non-oiled areas, to make a more tortuous path, effectively limiting diffusion of oxidant.
JMH
Originally Posted By: JHZR2
Just seems to me that the metal looks different between the outer (corroded) ring and the inner sheared area. Wouldnt know this without microscopy or preferably SEM.
Yep, an old corroded crack looks different to the plastically sheared area, looks different to the point of final separation.
Once plastic deformation has taken place, about the only thing an SEM will tell you is grain size.
Just seems to me that the metal looks different between the outer (corroded) ring and the inner sheared area. Wouldnt know this without microscopy or preferably SEM.
Yep, an old corroded crack looks different to the plastically sheared area, looks different to the point of final separation.
Once plastic deformation has taken place, about the only thing an SEM will tell you is grain size.
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