A circular aluminum tube of length L = 400 mm is loaded in compression by forces P as shown in Fig.2. 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 strain in the longitudinal direction. (a) If the measured strain is 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?
A circular aluminum tube of length L = 400 mm is loaded in compression by forces P as shown in Fig.2. 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 strain in the longitudinal direction. (a) If the measured strain is 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?
A car weighing 130 kN when fully loaded is pulled slowly up a inclined track by a steel cable as shown in Fig.2-b. The cable has an efficient cross sectional area of 490 mm2, and the angle of the incline is 30°. Please calculate the tensile stress σt in the cable.
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