Quote:
Originally Posted by Skippy
Meh, ferric alloys don't fail in cyclic loading as long as you keep the magnitude under about 60% of the yield stress. Aluminum is not so, which is why airframes always eventually have to be retired. A steel car body can go pretty much forever as long as you protect it from corrosion.
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Best I refer you to a good mechanical engineering text like "Design of Machine Elements, V.M. Faires". Small cyclic loads on most steel does cause fatigue failure eventually especially in normal atmospheric conditions.
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1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles 
1987 250td 160k miles English import 
2001 jeep turbo diesel 130k miles 
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
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