Hello there,
It is important to differentiate between global and local ductility of materials. The elongation to fracture is a measure of "global" ductility while local strain at fracture is a "local" measure. Your material is steel, so it likely suffers from plastic localization before fracture and the strain field becomes non-uniform; therefore, it is expected that the local strain (shown in your figure) is higher than the elongation to fracture.
Also, please note that ductility is a material-dependent property so 0.5 may not be representative for all materials.
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