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Both cast aluminum and cast iron can and do break and both are a pain to repair.
Also just like a forged steel crankshaft it can break and when it does it's because it was stretched beyond it's designed working point. So I too do not follow your correlation.
Or how about the massive B52 Bomber. It's wings would flex 22' from the at rest position to in flight position and these things have been in service for 50+ years. So again I do not follow your line if you want to discuss "High Stress".
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