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Aluminum
Unlike titanium, aluminum's fatigue strength declines continuously with increasing cycles.
Therefore, aluminum designs must include a greater design safety factor, which inevitably
increases weight and bulk.
A related issue is the failure mode of aluminum, which is catastrophic, rather than gradual.
Again, the design safety factor must be increased to compensate.
Aluminum is a good material for low-stress components that see little to no fatigue cycling.
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