rusty metal

Is it just me or do these look like they been starting to brake for awhile ?
a156471.jpg
 
That may be exactly what it is. Looks like classic "fatigue"failure, where a crack intiates at a screw thread, or a sharp edge, or at a stress concentration, and slowly grows and slightly grows, over time, and gets a nice crack initiated, then once it has a nice crack initiated, if it is overloaded, it undergoes sudden brittle failure and CRACK!
 
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