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Unformatted text preview: Goodmans theory for this problem. (25 pts.) (B) A structural member made of this material is to be subjected to 50 cycles at 260 MPa, 100 cycles at 240 MPa and 300 cycles at 220 MPa per day. Determine the number of days of service before it will fracture according to Minors Rule. (20 pts.) 3. A steel bar is connected to an aluminum bar as shown below. At 20 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 60 C. The properties of the steel and the aluminum are given below. (30 pts.) Steel E s = 30.0 X 10 6 psi s = 11.7 X 10-6 / C Aluminum E al = 10.0 X 10 6 psi al = 22.3 X 10-6 / C 6" 8" Steel Aluminum...
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- Fall '10