A circular aluminum tube of length L = 400 mm is loaded in compression by forces P (see figure). The outside and inside diameters are 60 mm and 50 mm, respectively. A strain gage is placed on the outside of the bar to measure normal strains in the longitudinal direction.
(a) If the measured strain in ε = 550 × 10-6, what is the shortening δ of the bar?
(b) If the compressive stress in the bar is intended to be 40 MPa, what should be the load P?

Transcribed Image Text:

Strain gage L=400 mm