Problem $7\mathrm{.}5\mathrm{.}9$

A $4\mathrm{.}0-$inch cube of concrete $(E=4\mathrm{.}5{10}^6,v=0\mathrm{.}2)$ is compressed in biaxial stress by means of a framework that is loaded as shown in the figure. Assuming that each load $F$ equals $25$ k $,$ determine the change $V$ in the volume of the cube and the strain energy U stored in the cube.

Problem $7\mathrm{.}5\mathrm{.}9$

A $4\mathrm{.}0-$inch cube of concrete $(E=4\mathrm{.}5{10}^6,v=0\mathrm{.}2)$ is compressed in biaxial stress by means of a framework that is loaded as shown in the figure. Assuming that each load $F$ equals $25$ k $,$ determine the change $V$ in the volume of the cube and the strain energy U stored in the cube.