A circular aluminum tube with a length of L= 600 mm is loaded in compression by forces P . The outside and inside diameters of 75 mm and 63 mm, respectively. A strain gauge is placed on the outside of the hollow segment of the tube to measure normal strains in the longitudinal direction. assume E=73 GPa and Poissons ration v=0.33. strain=781x10^-6
what is the percent change in its cross sectional area?
what is the volume change of the tube?
if the tube has a constant outer diameter of d2=75mm along is entire length L but now has increased inner diameter d3 with a normal stress of 70 MPa over the middle third while the rest of the tube remains at normal stress 57MPa what is the diameter d3?