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· Material failure under operating
conditions is also important. For a light-strong structure the log-log plot
of a failure strength against material density is of value in material selection.
The colored zones represent the same material classes as before, and the
red line represents a selected value of (σf
/ρ), where σf is an appropriate failure mode.
· For a ductile metal that should remain in its elastic
range, σf would be the yield
stress of the material, σy. For
a brittle ceramic, the fracture stress would be used. In a compression situation,
either a yield stress or a buckling
stress could be employed.
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