DW SD,
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So would jet airplane chassis which have been in daily service for 30 years. It all depends for what amount of cycles they are designed. But those also see very regular inspection intervals, including logging cracks and their propagation.
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True, but this is actually a concern in the aviation world too. I know there are some biz jet size planes that essentially cycle out in critical load areas. Ala, lockheed jetstar. Even some single engine piston airplanes (Bonanza for one) have oulined inspections for structural cracks.
The fact that airplanes are made of aluminum is in itself not a significant arguement that we should no one should worry about having an aluminum frame under their car. What it means is that when deciding to purchase something fabricated from aluminum, one must have faith that the manufacturer properly concidered the design loads. Ultimately, as all cars approach infinity miles, cycles, or what have you...they will be scrapped. It's just a matter of making sure you get enough cycles per dollar invested, to feel satisfied with the product.