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Unformatted text preview: be subjected to 60 cycles at 260 MPa, 150 cycles at 240 MPa and 600 cycles at 220 MPa per day. Determine the number of days of service before it will fracture according to Minor’s Rule. (20 pts.) yield = 320 MPa ultimate = 360 MPa 3. A steel bar is connected to an aluminum bar as shown below. The cross-sectional area of the steel is the same as that of the aluminum. At 10 C, the stresses in the steel and the aluminum bars are zero. Calculate the stresses in the steel and in the aluminum when the temperature rises to 70 C. The properties of the steel and the aluminum are given below. (20 pts.) Steel E s = 30.0 X 10 6 psi α s = 11.7 X 10-6 / C Aluminum E al = 10.0 X 10 6 psi α al = 22.3 X 10-6 / C 6" 8" Steel Aluminum...
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- Fall '10
- Tensile strength, Homework Assignment No., Apparent Elastic Limit.