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Ductility
A Ductile material is one
which exhibits considerable plastic deformation before fracturing. Two measures
of sample ductility are used: (i) the percent elongation that the sample
undergoes before fracture, and (ii) the percent reduction in area that results
during tensile testing to fracture.
The percent elongation = 100
x (Lf - L0 ) / L0 , where Lf and
L0 are the final and initial length of the sample, respectively.
The
percent reduction in area = 100 x (A0 - Af
) / A0 , where A0 and Af are the
initial and final areas of the sample, respectively.
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