Increasing flex in a steel frame?

Fatigue​

Fatigue is where a material may fail at well below its UTS because repeated flexions have weakened it. This is why every Aluminium component in an aircraft has a fixed life measured in hours before it is at risk of failure. Steel on the other hand has a Fatigue Limit. Any flexing below that Fatigue Limit will NEVER fail
Thank you or this, it reinforces what my dad and machine shop teachers both said. It's the reason why I'm afraid (deathly) of aluminum tank compressors.
 
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