DISCUSSION
Consider using the 3D Hooke’s Law equations to determine the three components of strain (εx, εy and εz) in the cube due to the applied stresses.
Write down an expression for the volume change ΔV in the cube due to the three components of strain (εx, εy and εz) found above.
From the results above, determine εz and ΔV for the values of Poisson’s ratio provided.
Ask/answer questions in the discussion thread below.
in order to get the volume change in V for the cube, do I just assume each side is just L+(strain in that axis)L ? And then I can just subtract the original volume to get an expression for change in volume of the cube?
Yes, that is a good approach.