Question: In a tension test, a sample has initial gage length l 0 and diameter d 0 , and its final dimensions are lf and df

In a tension test, a sample has initial gage length l0
and diameter d0
, and its final dimensions are lf
and df
. The average axial strain is defined by which of the following?
lfdfl0d0
lf l0lf
lf l0l0
lf l0df

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