Given

$-$A piece of $0\mathrm{.}25-$inch thick steel $(E=30e3$ksi $)$ is sandwiched between two $0\mathrm{.}125-$

inch thick aluminum $(E=10e3$ksi $)$ pieces. The width of the sandwiched bars is $6-$

inches, and it is $24-$inches long. The axially applied load is $25$ kips.

Determine:

The stress in the steel plate $($ ksi $)$

The stress in the aluminum sheets $($ksi$)$

The total elongation $($inches$)$